The World's First CVVD Engine - Genius!
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- Опубликовано: 1 июн 2024
- Hyundai's brilliant engine technology continuously varies valve duration!
Variable Valve Timing vs Lift (VVL vs VVT) - • Variable Valve Lift vs...
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The world’s first production CVVD engine! CVVD stands for continuously variable valve duration. This technology is currently used in the 1.6L turbo engine of the 2020 Hyundai Sonata. In order to understand it we need to understand how valves work on an engine. Of course, you have the four engine strokes: intake, compression, power, and exhaust. Intake you have the intake valve open, obviously, and your exhaust stroke has the exhaust valve open. On the most basic of engines, everything about how these valves operate is fixed, because those valves follow the cam profile of a fixed camshaft.
On modern car engines, there are variables we can change; three of them, as it relates to valves. First, there’s variable valve lift. This means you can change how far down the valve travels allowing for more or less airflow into the engine. Second, you have variable valve timing, this means you can change when you actually open this valve, you can open it sooner, or open it later, relative to its standard timing. And third, and this is what Hyundai is adding into the mix, is variable valve duration. This is controlling how long you actually leave the valve open. You could have it open and close very quickly, you could have it remain open for a longer duration, or anything between.
Up until this point, no mass produced engines have actually been able to vary how long a valve remains open, relative to the engine speed. If you’re wondering about Koenigsegg’s freevalve, and we’ll discuss that in the video as well. So, how does Hyundai do it? Check it out!
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*UPDATE!* There was another engine which had variable valve duration (Rover, 1995). I asked Hyundai about this, and from one of their presentations: "Such method, which allows change in valve actuation by altering the rotational speed of cam, is thought to be devised by Mitchell [2, 3]. The Rover first launched the engine to the market in 1995 [4]. The Rover’s VVC (Variable Valve Control) system was applied to 1.8L inline 4-cylinder engine in order to change the intake valve’s timing and duration. VVC system requires four camshafts to drive the intake valve; two of the camshafts are driven by timing belt at the front of the engine, while the other two is driven at the rear of the engine by the exhaust camshaft. Because of such feature, VVC system cannot be used with CVVT simultaneously, impeding the independent control of the valve opening and closing timing."
So in this case, the "world first" is the fact that it is the first production engine to combine CVVT with CVVD, as the Rover mechanism did not allow for variable timing. Thanks for commenting about the Rover engine - fascinating to learn about!
The Patent US8443774 this in the United States Patent and a PCT from 2005.... It allows Variable Valve Timing and vary partial speed of the cam combining both functions at the same time.... In the scope of this Patent literaly say: " The purpose of the device is to enable the opening and closing time AND Duration of the valves to be varied by varying the position and partíal speed of the camshaft in relation to the crankshaft. " It is the first device to combine CVVT with CVVD.
@@plasma081 "first production engine"
@@clv603 It said: " World's First CVVD Engine"
@@plasma081 please accept this gold star for your achievement in arguing within youtube comment sections. No doubt, you have earned many before. He corrected the error to explain once again that it is the "first production engine" using this technology in relation to the context of the video (which combines CVVT and CVVD). But of course you probably knew that already.
From Memory the rover VVC system was taken from an expired piper cams patent. Having driven a car with it I prefer it to Honda's VTEC system as you get a smoother power delivery throughout the rev range rather than that abrupt power change.
My old Hyundai actually had CVVD: Continuously Variable Valve Destruction. Of course, this was because the timing belt broke, but still...pretty impressive.
I had that system on my Renault megane aswell. It was the old 8 valve engine, and cost me pennies to repair. Honestly it cost me more in oil to flush (because i left it without the head on over my summer holidays), than it did in parts
Hyundai, the worst or nothing
Now that feature is included in the upper trim levels. We had to pay extra. These damn kids don't know the struggle.
@@More_OhSo The struggle is real.
:D
As a Hyundai technician,I can say that by far this has been the best explanation of how this system works, even surpassing that of the manufacturer training module. Kudos to you sir
That's why they sent everything from animation to mockup, because this is free real estate
YAY more stuff to brake!
@@Mr_Meowingtons .. and more stuff to break as well.
@@Mr_Meowingtons What can go wrong will go wrong LOL...........how many thousand dollars will this take to repair when they learn about its durability? 😉
Mechanical is way more reliable than electric, anyday of the week.
This is a pretty ingenious bit of mechanical engineering. Alright, Hyundai, I'm impressed.
Whats terrific is not just the idea but that Hyundai actually let the idea run through development and will produce it. I imagine its all about the production costs. In South Korea they can produce it economically while here in the USA maybe not
I like the idea but this seems like an expensive repair that will likely be a common wear item. More moving parts usually means more problems.
Hyundai are really pushing the boundaries with experimental technology and research right now. The n vision 74 is insanely cool, the elantra n is also pretty cool.
Its all about the engineers the brought over from BMW, AUDI Porsche and VW. There maybe a few' former mercedes personell.
Hold applause for continuous reliability after years of use and miles under its belt.....
"The BEST part is no part" words are engineers should strive to live by.
if I remember correctly Space X has said something to that effect.
Then you have nothing. 🙄🤦🏽♀️
@@JohnLee-db9zt ICE of for toys, and the consolidation of multiple parts to serve several functions is how "genius technologies" such as these have become waisted effort to cling to life. 🤦🏽♀️ ICE is a collective of complexity to do a job at staggeringly low efficiency and badly at that. No one rides horses to work anymore this will be like that in a fraction of the time.🐴🤣 So get 'em, cowpoke.
@@JohnLee-db9zt The point is more parts more problems. If you can make something that does the same thing with less parts it is less likely to break down wasting time and resources.
@@absolutezero6423 Obviously, no one has come up with economical CVVD/VT with less parts. So fail to see your point which seems useless.
This reminds me of how clarkson described the turbo: "exhausts gases go in, witchcraft happens, and you go faster."
What is to explain with a turbo? Exhaust gas leaves the engine under pressure, and the turbine extracts the energy from this pressure. The hard part is having to hook up the ground cart, or diverting air pressure from the APU; for the actual turbine spinup.
@@wyndhamcoffman8961 r/woosh
clearly you weren't paying attention.
What happened in this reply section? I can't make any sense of it
How?
That’s really a genius design. I can imagine the pride those engineers feel knowing they’ve created something so complex yet entirely mechanical.
They just copied and superimposed orbital paths...
@@josiahr1375 JUST
Except, it relies on an electronic actuator to drive it...
Does that look more reliable that a bugatti-beating drivetrain with 2 moving parts which can do 1 million miles? That motor will get dust sprayed on it up and down town.
@Teslamoanials Derivedit is possible to build a centrifugal control unit which can drive a no linear output it not es easy but only without the Edison cycle option in low engine load scenario a proper ecu can hadel such a thing better
It's actually amazing, not the variable duration. But the fact that the heat treating processes for these parts has finally been dialed in to such accuracy and repeatability that they are able to mass produce.
Here's one to process engineers - the so often forgotten appendage!
So easy to do using electronics, so beautiful to see it done purely mechanically.
easy you say. how? with piston speeds so high wouldn't the speed of electricity mean its less precise? pneumatically controlled valves seems complex and a waste of time in my opinion
@@BCzepa considering electricity works at light speed I don’t think so
First idea that came into my mind. Any mechanical surplus adds to added heating and risks of failure. So much simpler and more reliable to do it in software.
But then you'd still have to modulate valve actuating with additional mechanical parts.
And BTW it's not about the speed of electricity, it's about the speed of processing and speed of (optical/magnetic?)sensor reading. My uneducated guess: at least 500KHz if not in the range of MHz. With that minimum it would correspond to 30,000,000 cycles/min. For engine revs of 10,000 rot/min it means a resolution of 3,000 positions per engine revolution, or 1,500 positions per piston travel. The resolution increases even further due to decreased piston speed at the end of its travel.
@@FirieonOG The bottleneck of electronics is how fast a microcontroller / microprocessor can "read" how fast electrical signals can come through (in Hz). If the frequency of these signals exceed that of the chip, then you have an issue.
@@FirieonOG Electricity does, but electronics don't. I am not refuting the argument as a whole, just this statement.
Whew... I’m glad there wasn’t a quiz at the end!
Luckily you can replay the video.
Phill M156. Err......didn't BMW do something similar more than ten years ago annnnndddd........haven't steam locomotives been doing the same thing since forever? Just askin'.
Roger Whittle don’t know about steam engines but Bmw Vanos is timing and duration, not all three. Honda’s was lift & timing. Their high lift cam lobe was engaged by a pin at 5k rpm, no variability. Honda’s was the most fun, it was like having another engine from 5k-8k rpm.
@@phillm156 Obviously, there is no direct comparison between steam and any two or four cycle IC engine, but their valve gears - there are many different types - control the point in the rotation of the driving wheels that steam is admitted and the length of time over which it is admitted. This controls the amount of steam used each cycle and thus, economy. To a great extent, it also controls the amount of power produced.
I was being a bit facetious, but they really have been doing it since before Stevenson's 'Rocket'!
~?. The planet is dying 🚗💨🤯. Electric ⚡️🚗🚲🛴🚶♂️🚶♀️.
You don’t want to do it with you 👽🔪⛓☹️/😵🔴💩🦠🍖🛒👽. Totally hypocritical !!!! Innocent animal bludgeoned to death, for a hamburger 😒🦠🍔 that is a coward !! Are used to be a coward 😞🦠🍔, but now I’m vegan ✅❤️😬💪, I don’t murder the animals, I don’t torture the animals, I don’t massacre the animals. ✅👍.
"Awh man, what went wrong with your motor?"
"I spun a lobe."
:DDD
240sx guys are now trying to find something other than bearings to spin
Hahaha this is exactly what I thought would happen, hey I have been wrong before and Hyundai has improved over the years but this seems like it will either be nice or a disaster, good on them though for taking the risk
No big deal GMs do that all the time, except they stay spun.
@@Broyourenglishisgood haha w/e bro ;D
Thank you for a well-rehearsed lecture. That confident, enthusiastic, non-redundant explanation ensures that comprehension lag coincides nicely with attention-span interruption: the brain shifts from listening to understanding, hits eureka, then enthusiastically shifts to listening again. That actually parallels the intake/exhaust valve cycles.
I have heard lectures where a person spoke without rehearsal, and either his technical knowledge outpaced the comprehension delay of the audience, or his tedium got outstripped by attention span. You have most excellently explained in such a way that an engineer would not get bored, and a non engineer would not be overwhelmed.
Just imagine trump giving this lecture?
@@codyhatch4607
Hahaha.
Your TDS is showing.
@@codyhatch4607 Oh, that’s just plain mean 😜
Ingenious! I’ve been driving Hyundais for 14 years. They are famed for not only reliability but also design brilliance.
Who's here after James May called Jason "a clever bloke." Congrats mate, you deserved to be praised by one of the world's best!
Mo G
Yea
where was this? I need the video lol
Lmfao! This guy is a moron!
@@spectrumofreality no u
I need to see that video mate
it's so beautiful to see a Mechanical advance in 2020, nowadays everything is digital and electronic
Rover did this 20years ago nothing new
@@thomasbacon In my car the trunk opens when you hit a bump in the road lol.
Couldn't agree with you more. And this is coming from an Electical & Electronic engineer. Elegant mechanical design just as important, if not more important than just having everything electronically controlled
So true, thanks for pointing that out. In this electronic, information age people forget that mechanical design is still important. Sure some mechanical systems don't translate to an electronic system, but until we are 100% electric we will need mechanical improvements to move us forward. Not to mention there is something very beautiful about a fully mechanical system such as this. All the moving components make my head hurt😜
@@TheDeGhoul You and me both brother
You explain complicated engineering very simply at times and it's much appreciated.
I have the 1.6 turbo in my kia forte gt. Best car ever! Burger JB4, AEM intake, throttle race chip, catch can. I'm putting down over 300 hp on a fully stock engine! Fell in love with the hyper-responsive 1.6 in my 04 aveo. Couldn't wait for thr turbo, and it's better than I had hoped. Thank you Korea!
Modern metallurgy. Making old ideas actually possible
Buck Deniston one thing the Japanese excel in is material engineering. We see many plastic parts in a Toyota (for eg) that is still sturdy after 10 years/300,000 miles. However on a BMW (for eg), those plastic parts would have been crispy and flakes off after 4 years of use
Yi Su LEE right. Knowing the right material to use is a huge and often overlooked aspect of what makes a car reliable.
@@yslee1401 It appears that the Koreans are also exceptional materials scientists.
Modern metallurgy and modern high precision machining. Based on what he said at 11:07, it sounds like even with precision machining they might be matching parts to get the perfect fit. If they are doing that, then the desired clearance range must be really small.
@@yslee1401 manufacturers might do that on purpose, or in willful ignorance just to save some cash unfortunately
I am not an auto mechanic but I do understand the basics. This presentation is so well done that I picked up the concept and theory-of-operation on my first run through the video. I didn't have to pause/rewind/re-view any portion of it. Cu-do's to Jason for such a well done presentation!
*Kudos
By the way
he does repeat some stuff more then necessary
"Cu-Do's"? You had better check your local city and state regulations. 🤣
Is there a test at the end?
After listening to your explanation to "why youtube viewers can't say it will be unreliable" I have to say "IT"S TOO COMPLEX AND WILL BE UNRELIABLE" and or it's extra complexity will require more of everything you mentioned; engineering time, materials expense, part manufacturing costs, lubricating tech, and a PHD in physics to tune it correctly. NOTED: it takes far more time and intellect to create something new, than it does to see that it is complex! I gave thumbs up! :-)
It seems like a very complex apparatus for just a 4 or 5 percent increase in performance or efficiency. But I am told to small amounts of efficiency like that proved to be great improvements over time. like giving every car on the road one extra mile per gallon of efficiency saves millions of barrels of oil a year
You were *determined* to "Be The One" to say it!
I have this engine and you are correct. The theory and benefits yield to complexity and problems in less than 2 months and 1,000mi. I hate this engine and it unfortunately defines Hyundai.
I like how the demonstration piece at 2:43 is mounted on a long valve lol.
Wow, I never thought I'd see something like this as a mechanical system. I just assumed everything would be like free valve in 20-30 years.
2 strokes are valves free, not equivalent but way more simple xD
@@berjerk3425 Oh wow, it just occured to me that you could setup a free valve engine to switch to a 2 stroke cycle for power and back to 4 stroke for cruising.
@@gedavids84 2 strokes cylinder heads are different
@@gedavids84 Yeah not going to work :)
@@gedavids84 new koenigsegg gemera can do that
10:40 2 months to develop the tech, 8 years and 10 months to make it not break.
Gotta appreciate the engineering behind it
@@asit6947 or the laziness of the engineers.
@@Jamie-cz2xu if fatigue science is that easy u won't see people buying Toyota everywhere
@@gdpvk Its a joke lighten up
@Богдан Кондратов or if you dont change oil regularly
This design is pure genius, giving an engine the best of all worlds.
This video and instructions are wayy more effective than 3-year of classes about engine building - cutting-edge technologies ! It is a must for any engineer
The sass directed at the RUclips warriors might be my favorite part about this whole video.
Everybody is an expert!
Only a RUclips warrior or cultist would leave such a comment
Except he ignores the fact that Hyundai has a huge recent problem with motors seizing.
Can i just take a minute to appreciate how well this has been described in perfect detail 👌
This is one of the best videos I’ve watched in a long time on any subject. Thank you. I really enjoyed it.
Purely mechanical, but controlled electronically, like VVT, VNT, VVL and everything else.
Great to see more innovation from these companies and I truly hope this works as well as they say.
Tuners will now require a PhD in string theory.
Only professor Farnsworth can fly the Planet Express ship through 2D!
@@ekummel that show was so far ahead of its time. Terribly underrated.
Luckily it's much easier to tweak established stock tunes than designing stock tunes for new engine technology.
@Allie X Well.. in Theory.. yes =D
not string theory though. The whole concept is bollocks.
9 years of engineering makes me appreciate my 21 Sonata N Line further more
If only the Sonata N line comes with AWD, then it wouldn’t be a tire burning machine.
your N line has the 2.5 liter engine. This technology is for the 1.6liter
Thanks for obtaining physical models for the visuals. Now that's going the extra mile! 👍
Going to feel bad for people who slack on oil changes 😂
Those peeps who miss their oil changes are gonna pay
that has been true for quite sometime now
I won’t...
Cough cough cam phasers
Funny that was my first thoughts.
Had my step son leaning over watching this with me and saying " I'm not really interested in this, but it's interesting!" He's 12, maybe catching the bug :)
Get him something he can emotionally appreciate like a nitro RC car or a small 2 stroke dirtbike and figure out how to fix them together.
^
Well it is a little too technical for a 12 year old to wrap his brain around. When I was his age I liked older cars not because they were fast but because they looked cool.
@@CreatorCade yeah I'd say wait until he's 13 or 14, that's when it all started to click for me. Did my first top end rebuild at that time on a big bore 88yz80 haha. Those were good times.
Josh Cade When I was 12 (at the start of high school) I was already rebuilding engines with a couple of my friends. I had no problem understanding CAM shafts. There’s 12 year old kids today who do very complex coding. If only I was 12 and had 55 years in front me to have all over again.
I am so glad you included animations in this video.
Hyundai is really stepping up their game lately, I bought a Veloster N in January and I was beyond impressed. I continue to be impressed every time they release something new
Honestly dude they have been on the upward trend since like 2012 it just takes awhile to get the recognition.
Hyundai: We made better cam timing
Koenigsegg: Who needs cams
Hyundai: 14,000 $ driveway
Koenigsegg : 14,000 $ for one oil change
Series hybrid - who need multiple rpm?
Electric - who need combustion?
@@markm4603 Koenigsegg freevalve Sent to mass produce in China = 29.99cts for a complete set of valves
@@drzerg2 UFO: We use gravitational levitation !!
me: i sit on chair
I'm glad how honest they were with those percentages, no crazy numbers
@@xXGeth270Xx Its really hard to improve combustion engines further from what we already have. That's why a lot of companies are looking into EVs for more powerful vehicles.
@@xXGeth270Xx no, it's not, it's hard to evolve what is a pretty mature technology I think its pretty remarkable
@@xXGeth270Xx My best guess is it took that long due to engine stress and torque the part needs to endure, plus margins of error and tolerance and a million data points and testing (plus the scientific method for each revision)
@@ericsmith6311 I actually think combustion engines can be improved quite a bit more, I would not be surprised to see a car get 100mpg in flat highways at some point.
If I could spend $95 instead of $100 every time filled up with fuel. I think I'd be pretty happy with that!
Wow... You did an amazing job of explaining this.
I’m betting a good chunk of that 9 years was researching the interplay between lift, duration, valve timing overlap between exhaust and intake as well as making it reliable.
The sheer amount of number crunching involved must have been immense.
I won't say that it would not have been possible without computer simulation, but I doubt it would have been as good.
In the infamous words of Mr. Scott: "the more they overthink the plumbing, the easier it is to stop up the drain".
Great presentation!
In this case it can be literal if the oil pathways are more prone to clogging.
Spoken like a true poet!!!!
God bless scottie!!!!
@@Patchuchan; I never even considered that! So trying the 20,000 mile full synthetic oil would probably not be too wise to test this early in the engines introduction? Just sayin'
@@davidwright1653 I'm positive 20000 mile oil is a sales gimmick. Don't leave it in that long.
@@davidwright1653 Telling the average person they can go 20,000 miles on an oil change is a bad idea on any engine as all engines burn some oil.
If they don't check it and top it off periodically it could end up two or three quarts down by the time they do an oil change.
"The Goldilocks Position" just right. Very cool video, killer presentation, thank you
The duration of this camshaft is too long, and the duration of this camshaft is too short. But the duration of this camshaft is just right.
How to eradicate more coral reefs: take his advice. Does that look more reliable that a bugatti-beating drivetrain with 2 moving parts which can do 1 million miles? Durtech.
monstercolorfun co
The mechanism is new but the type of technical implementation has been around in crankshafts and camshafts for decades. As for any newly designed engine also this one could have a flaw but I wouldn’t consider the risk of that much higher for this engine.
The benefits of this engine are worth pursuing. Nice video!
Fantastic… you demonstrated it amazingly … so clearly… thank you!!
This is a mathematician's solution actually applied by engineers.
Everything uses Maths/Maths can be applied to anything.
...much like atoms.
Having a theory is one thing. Realizing it is a different story
yes. there's a long history of auto engineers trying too hard to implement mathematically beautiful ideas. the germans are notorious for it, going back at least as far as ww2 tanks that were technically very superior on paper, but much more expensive than russian tanks and difficult to maintain. maybe the best example though is the wankel rotary, with its mesmerizingly elegant geometry, but fundamentally unsolvable issues with lubricant flow and heat distribution. a lot of R&D that became endless money pits and never saw production could be described as "a *perfect* solution that we _just_ need to iron out a few little bugs". this is also the story for virtually *all* amateur re-inventions of the internal combustion engine. imo, congrats to hyundai that they've turned this idea into a real world solution
This isn't a comment
Obligatory "Hyundai and Kia are KILLING IT these days!"
My girlfriend's mom recently bought a new Kia Optima. She took us for a ride in it and I told her I heard valve lash and she should get it looked at. Car had under 1,000 miles. She was offended I had the nerve to suggest her new car had something wrong. 2 weeks later she was getting check engine lights and the engine was running horribly. The valvetrain was self destructing and she needed a new engine. It was fixed under warranty. But I am still really turned off by the fact her Kia didn't last a month before the engine was trashed.
@@Plur307 it's not unheard of for engines, transmissions, diffs to break so early. It's a manufacturing fault, so stastically it's basically impossible to get rid of all faults
@@Plur307 Kia is killing it(self)
@@Plur307 Literally all manufacturers encounter the same problems. Engines have thousands of parts, both mechanical and electrical, and the most likely time they'll have issues is when they're new.
Obligatory "Hyundai and Kia are trash"?
OMG!!! This is a beautiful channel !!! Thank you very much for your great work... Thanks... Thanks ... Thanks ...
Just saw this. Its surprisingly simple , but brilliant to those who came up with it .
"You might be wondering about Koenigsegg's free valve..." GET OUT OF MY HEAD!
Americans pronunciation of European cars is really ignorant... “KERN” Not “CONE”.
KOENIGSEGG.
I was gonna comment that but found your comment atleast ik theres still hope in humanity
I'm saying
Americans don't need to worry about pronouncing foreign words, from the old world, since y'all can't pronounce American words.... And since American companies run the world, you're all a bad joke of bitching whiners to us anyway...
@@nc3826 lol, American companies don't run the world Samsung and Toyota are 1and 2. Not American. It's easy to tell you are American, with your ignorance and all.
I definitely like the idea of purely mechanical systems.
I love them
they just aren't as efficient
@@jamest3597 But less likely to malfunction randomly. And Hyundai has really thought about reliability when they implemented those oil holes there. Time will tell, but for some reason I could see those things last quite well (if people don't ruin them with long life oil changes...).
As a mechanical engineer, so do I but I'm biased what can I say
@@whogavehimafork lol
just brilliant. love you videos. greetings from slovakia!
Many thanks for this video. Congratulations !
This video was so well explained I almost understood it. xD
Wow, this absolutely fascinating (both mechanically and you explain it in a way that I understand). Also 9 years of development, backed by their 10y/100k warranty!
One engine failure...
RUclips viewer: "Told you it wouldnt work"
🤦♂️
Nowadays, the average American worker is traveling much farther to get to and from work or job site to job site. 100,000 miles is NOTHING. Most of us will put that on a vehicle within 5 years........so the "10 year" end of the warranty is a joke. I bought a new 2000 Toyota Tacoma 4x4. 20 years later, it still runs & drives just fine on the original engine ( 3RZ 4 cyl ) and auto trans with over 346,000 miles on it. I don't live where they salt the roads every winter, so I don't have to worry about rust. Got a friend who has been working for Toyota as a mechanic/tech for over 20 years now. He says there's no way in hell that even the new Toyota's with VVT will last anywhere near as long as mine. He should know, he works on all of them every day, including his side business.
@@howabouthetruth2157 I swear to god it has something to do with the blocks being cast iron rather than aluminum. You cannot go wrong with a cast iron block and the durability it brings with it. granted the heads for the RZ series at aluminum but still, my iron block, aluminum head ranger is kicking strong day to day with 150k. My moms 2013 corolla let loose at 145k.
i mean i could be wrong but....cast iron is considerably stronger than aluminium
A joke of a warranty is the 3y/36k. Your "average American worker" comment backs it up.
@@snowysysadmin59 Your mom's 2013 Corolla had variable valve timing. Those usually won't last near as long as the older ones. My little 3RZ motor also has a real timing chain & gear too, unlike the V6 from the same era that has a timing belt that needs replaced. Mine also has a factory forged steel crank. SO glad I didn't buy the V6. The only down side to aluminum is ya can't ever let em run hot. But I still prefer an iron block of course. After Toyota canned all of their simpler engine platforms that are famous for super high mileage ( especially the 4 cylinder platforms with forged cranks ), to replace them with all new engines with this damned variable valve timing, the durability has gone down hill. Still more reliable than most of the competition, but no way they are going to last like any of their older engine platforms. The only exceptions are these guys running highway miles only. Plus, all of these newer VVT engines have to run oil that's nearly as thin as water. That in itself poses durability issues, and every good mechanic will tell you that. But ya can't run any other oil type, because the super close tolerances & teeny tiny oil galleys in these newer engines need that water thin crap to run.
If you think they care about reliability you are so wrong. They care about CAFE!! If it breaks in warranty they fix it on their dime... if it breaks out of warranty it you big dime!!
Really good job explaining this.
I can't believe I missed this one. Well done to the team(s) who solved this puzzle!
when honda introduced vtec the skeptics said it would never be reliable and look what happen vtec is one of the most used, loved and trusted technology in the car performance car community.
Plus, that boost when it kicks in, yo.
Initially, it would be a bit of an ask to abandon Honda's VTEC in favor of CVVD, if only because VTEC is so smooth and bulletproof, especially in Type R. Anybody remember BRM's H16? That's 16 pistons, not valves. That it ran at all with the technology of the 60s remains a mystery. Poor Jim Clark - 1 win at the USGP was it, and they retired the motor. I'd prefer to see the CVVD progress to a Type R version, and a year's hard use in a car, before considering it. And I'd like to see some serious HP/torque figures to recommend it above VTEC's output.
@@truantray I prefer another VTEC related phrase: "all the lag without a turbo!" :)
*Honda made in Japan
not its *chinese counterfeit copy
@@kenkalajdzic that's one of my biggest complaints with my Civic, when I get to 3k RPMs I have to wait for power. I rarely go above 3250-3500 RPMs so it is really annoying. wish I could choose to give up the extra ~8hp
So unfortunate lol
Koenigsegg just announces the gemera that uses the freevalve technology right as Jason releases this video lol
Happens...
True but still not mass produced. Will make for a good proof of concept though.
Doesn't matter. This system could still be more prefered, we will see when the cost and reliabillity data comes. Possibly free-valve tech will be much more expensive and not worth it for the cheaper economy class engines (Where Hyundai/KIA are brilliant). Anyways competition is always a good thing :)
i was just about to comment this. if freevalve turns out to do half the things its said to do it will be revolutionary. its sucks its taken so long to make its way into production cars
@@exidous6831 I think china auto maker Qoros is/were gonna mass produce cars whit free valve system from konigsegg
5% fuel efficiency gain . That is impressive. I like the move towards the atkinson cycle , this is where big gains can be achieved and it is great to see Hyundai doing something innovative and practical.
I just bought a 22’ Rio hatch and it has 156 miles on it. Even with still breaking it in I’m averaging 37 city and 47 highway! It’s great
Very nice explanation of a complicated system.
"See how Hyundai uses this one simple trick to allow valves to open and close for different durations(Cam shafts hate them!!)"
_weird_ trick.
LOLOLOLOL
“A part actually has to break for something to go wrong.”
*But when something breaks, everything will go wrong.*
Not everything, only one valve group by design failure point is on the pin
A guarantee for 10 years/100,000 miles, then you're on your own. Lol! It has an actuator which is electrical, so everything is not really mechanical, in my opinion.
@@TononiaWorld if a valve fails it will crash against the head of the piston and your wallet will be pretty pissed off
@@lexol3347 I prefer a vacuum-assisted actuator if you ask me. then it's truly mechanical
Most engines are interference engines, so yes, if something fails in this intricate system and a valve doesn’t close your engine will promptly grenade itself
I have a 2012 Fiat 500, it has a similar system. It uses oil pressure to control each vale independently.
Fiat's system is way cooler than this, it can even run multiple valve lift events in a single intake cycle. I don't know where Jason is getting that this is the first continuously variable valve duration system because it's obviously not.
Amazing and you did a great job explaining the system
When you think about everything that is moving within the engine, the high revolutions, heat, and pressures generated, it is amazing that any engine doesn't blow apart in less than one minute.
It's all about pressurized oil in thin films acting as the sacrificial surface, which is a trip all on its own. Like _"yeah, I'm just going to use this _*_liquid made of strings_*_ to separate hundreds of Kilowatts of mechanical energy."_ Sometimes I swear this has to be a fever dream.
@@AtlasReburdened though even without oil most engines will last a bit longer than minute.
Love the visual aids and the presentation. Great work. Where were you when I was in school?! I need you to get in a time machine and go teach at my high school.
My my my this guy has thought me about how all these systems works in a couple of videos what I haven't learned in 47 years.... thanks dude!! Great channel!!👍🏼👍🏼
Impressive video. Thanks for the hard work and sharing.
Your explanations are so good that you make me feel smarter than I actually am
I love how he explained some things twice becasue i was almost going to rewind.
I wish all my college professors would be this interesting/great at explaining
He is good at explaining, but I waited 12 minutes of how before he even began to explain why it is useful. How about the quick why before the long how? And it sounds like he's yelling at us.
@@BrBill
>sounds like he's yelling at us
Have you been to Scotty's channel?
Your college professors don't really care if you learn or pass. You are just another number and part of their paycheck.
Great mechanical achievement, hats off to Hyundai. Great presentation, thanks!
Best explanations on all things mechanical , great series
Amazing. A portion of my life was spent working on an electronic valve actuator that ultimately failed. I recall thinking there must be a way to do this with a cam. Glad to see it happened.
Why did it failed? How much power does it typically needs?
Wow that's ingenious!! We grind custom Stage cams for Honda Small Blocks (V6 J-Series engines 😋) and this was interesting as hell to see!
THANKS for making this Engine much more understandable. Do other CVVD engines operate on the same principal???
Very informative. Thanks!
I would love to see a follow up with a used engine and see where the weak points are. Great top notch videos. Thanks
very impressive. I always love seeing these purely mechanical advancements. Hats off to Hyundai for building this!
Love your videos. Thank you for the education.
Another really good reason to keep up with your oil changes. :)
I dont care as long as all these little dots line themselves up easily when doing a chain or belt replacement!!
Can you imagine a timing job ! Hope your right
The timing process would be the same as a conventional timing chain set-up.
Seeing as the camshafts main body is rotating at a constant speed, any changes would be done by the ECU by moving the system through it's range of motion.
@@ashtompkins7887 I guess it would, trying to think if the motor that turns would be some sort of stepper motor or there are extra sensors along the cam for the ECU to know where all the positionings are? If you disconnected the battery would the ECU retard the cam to 0, set it's position or use another cam sensor?
ifell3 I was about to say the same thing; surely that actuator has absolute positioning, otherwise that could go really, really bad.
I'd imagine it'd be a stepper motor. And that it would default to a 'zero' position in the event of a system fault. (Failed motor, broken wire, software glitch etc)
So glad you mentioned Atkinson Cycle. I was thinking this seems perfect to allow that at cruising speeds.
This is more of a miller cycle engine, since it will be turbocharged. Meaning the diferances in power bands might not change too much.
@@shamandarnell That's a really good point. I continually forget the Miller exists.
@@aaronhowell2011 Toyota has been using atkinson-miller engines in their hybrids since the Prius came out in 1998. The narrow rpm band for miller fuel efficiency is accommodated by the eCVT.
Excellent explanation, thank you so much!
In addition to the Rover VVC system used on the 1995 Rover MGF, there's also the Fiat Multiair which used electro-hydraulic valve seats in the 1.4L FIRE engine introduced in 2009. It had continuously variable valve lift, valve timing, & valve duration. It also had a unique multilift mode where it could open & close the valve multiple times within the same combustion cycle.
Its major disadvantage was that it was bulky and in the Fiat implementation on used on the intake valves, while the exhaust valves had fixed camshaft and timing. Rover's VVC was also very bulky & complex. This Hyundai CVVD system happens to be more elegant than both the Rover VVC & Fiat Multiair.
Rover problem was bad quality materials the system is actually nice engineered but the metal tracks where needle bearings runs is too soft
There is only one valve tech that you can really feel when driving, and it is KICKING, YO!
"Bro did you feel it hit VTEC"?
Yeah if I had a choice over hyandi or honda the awnser is VERY clear
...
@@matthewb7049 the answer is always Subaru
CVVD just kicked in yo!
Said no one ever.
You're telling me you don't know a single car person who will freak out and exaggerate the feeling of a 5% power boost? XD
Sean Cunningham,
"... Said no one ever."
Except maybe whenever they check their MPG.
@@ArcoZakus 1989 honda crx:
-48 mpg
- 0-60 9.7 seconds
- Weight: 2048 lbs
2020 hyundai Sonata
- 38 Mpg
- 0-60: 8.6 seconds
- Weight: 3120 lbs.
The hyundai looks pretty good. Until you consider the 30 *YEAR* difference in technology.
1989 honda Crx Co2 emissions 170g/km
2020 hyundai sonata Co2 emissions 162 g/km
I will admit that the CRX won't fair as well in a crash lol. Also recognize that these cars are from two different weight classes. Just food for thought.
@@arcadiagreen150 Huh.. thats actually very interesting. Thanks for that info!
@@arcadiagreen150 nice format
I'm all for electronically actuated valves, but this is incredibly designed
Jason, thx for sharing. It was a great explanation. I'm an electronics guy, but properly designed mech systems tend to be much more reliable. A great example is a mech home thermostat or even a mech thermometer. So, I get the reliability aspect. The energy requirement to run Koenigsegg's system is certainly a concern and would require a study.
Seems like this system has it's roots in the Antikithera mechanism. That mech is able to have variable speed orbital items and uses an offset pin and other components to effect that eccentric variable speed motion. The Hyundai team adopted that into their design for higher speeds and loads all the while ensuring reliability. Studying things in the past sometimes have a place in the present.
Again, Jason thx for sharing.
Nice explanation.I came to the same conclusion independently.I have to think that the engineer(s) who came up with this saw a documentary on the antithekitera mechanism and thought that is brilliant where can i use that.The genius of archimedes is still being used in a way he could never have imagined.I have to wonder what other kinds of ancient technology is being used or will be used of which i have zero knowledge.
I am not engineer guy
Is the CVVD engine better than other engines?
I really enjoy the way this gentleman Explains everything In the simplest of ways with good illustrations and working models.
Well done, keep up the good work.
if you can handle his voice and cadence... which bothers me after a short time.
I can’t wait till 2030 where we can download a big cam
Robert Craig Tesla model 3 awd owners were given that option
It likely wont work like this, per se. Because the one thing better than this, is controlling the opening and closing events independent from eachother for both the exhaust and intake valves. In the end, maximum power or efficiency isnt based on the lift, timing, or duration, but when each of the specific valve events are happening in relation to rpm, throttle position, etc. Meaning IV opening and IV closing both have their specific effects on power and efficiency as well as EV opening and EV closing (the 4 valve events in total).
With this system you can change duration yes, but you cannot control the opening and closing events independent from eachother, which is the benefit that a free valve system would get (minus the fact that you cant continuously change the lift like a free valve system could). This is because its not necessarily the duration or cam timing that are a deciding factor of efficiency and power, but the 4 individual valve events themselves and how they operated based on numerous factors of the engine itself such as displacement, bore, stroke, intake runner length, exhaust system, etc all boiling down to how valve events work to be more efficient based on these factors. The cam duration and timing is a result of controlling the 4 events, not the other way around which is why controlling the valve events independent from eachother would be the ideal situation. BUT when pairing CVVD with a type of VVT system, you could technically achieve this same effect (minus continuously variable lift), but it would likely be more complicated mechanically. You could retard the valve timing itself to lets say, for example, make the intake valve open slightly later, BUT if you were to increase the duration at twice the rate in terms of total degrees of duration change, you could cancel out the retarding of the intake valve opening (advance it the same degree the cam was retarded), but it would also retard (happen later) the intake valve closing event (because when you increase duration at the same cam position, the IVO advances and IVC retards), meaning you could hypothetically keep IVO in the same position, while having the intake valve closing at a later point, effectively controlling the opening and closing valve events independent from eachother. This could also be done with the exhaust valves as well, and be done in combination with the intake valves to maximize the benefits of power and/or efficiency (mostly from valve overlap and EVO/IVC timing and how they play a role with eachother). You could do this in any number of ways, for power and/or fuel efficiency, by retarding or advancing the cam timing itself any number of degrees while simultaneously changing the duration to either over or under compensate the change of a specific valve event to move it in a certain direction or keep it in the same position while also changing the other valve event in the same way.
Which, I suppose you could "download" that calibration for the camshaft/valve events, but it would be really specific to any given engine, and likely be a custom calibration.
Most cars would be electric by then
That's going to be a really cool way to get destroyed by cars with electric motors.
@@yslee1401 All of them, probably.
Very interesting. Thanks for the details.
Brilliant explanation and I am loving this technology
This is honestly one of my favorite RUclipsrs of all time.
this would make much more sense in a diesel engine to reduce air on low load - poor mixture scenarios and by extension , reducing also NOx emissions and possible removing the need of an egr
Funny you should said that. Hyun/KIA had a very long-term GDI and TDI diesel plan mapped out for their vehicles.
We can thank VW for screwingthat up for everybody in Murica.
Glad to see that they are still innovating in spite of someone else's snafu
I was thinking the same thing. I would love to see any documentation or test results on a diesel system.
@@AllenZee do you watch AutoExpert maybe? "Murica"
@@DunateoRom8v37 I don't !!! Will check it out though. THANK YOU!
I wouldn't call it a poor mixture per say, just a overly oxygen saturated mixture. I do believe the new 1/2 ton diesel engine from GM no longer requires EGR, they have solved that issue by using the turbo's vane control combined with some good valve control to hold more exhaust in the cylinder after the combustion stroke. This is great because it really simplifies the whole process and doesn't require adding a lot of new complexity.
Excellent video - thanks.
Great explanation Owen Wilson.
Owner: How often do i have to do a oil change?
Hyundai: Yes
Fuel dilution in GDI engines have already made that a thing. I have to change my 2019 turbo Hyundai every 3k miles to keep the oil in spec.
@@MLGXBOXPRO buy Toyota next time.
As a hyundai/kia KINDA enthusiast, the WORST problem with them is the OWNERS who never change the oil.
@@josiahr1375 eww... just eww
That's the engine's Achilles heel for sure. You will have to stay on top of oil and filter changes.
I think the real genius is Jason's ability to communicate this highly complex and complicated piece of machinery.
Agreed
A clear explanation ,but I am not happy with this too much complication and increasing the moving parts .thanks for the video
Thank you for this explanation of my i20N engine