Support d4a: driving-4-answers-shop.fourthwall.com/ Bussisimo: amzn.to/37wLhX4 GTV6: amzn.to/2ZvB9JF Such a bore: bit.ly/36jYWQI Build the flat: amzn.to/2OpcIfa Wear the VR: amzn.to/3qOHDhM
(Posting this here so that hopefully people will see it) I'd like to add a few extra points in addition to what you pointed out in the video: Most people don't know this, but another reason that most V6's are 60° is because this V angle offers perfect primary balance while maintaining even firing intervals. 120° and 90° even fire V6 have bigger horizontal imbalances than vertical for each pair of cylinders resulting in a rocking moment. If the peak primary force of each piston is 1, the peak horizontal and vertical imbalances are 1.5 and 0.5 respectively for a 120° V6. The crank weights are sized to balance out the average of the imbalances so that the remaining imbalance is circular. In this case the remaining imbalance has magnitude 1, so a single balance shaft generating a force of 0.5 (with weights 180° out of phase) would have to be used. But as D4A mentions in the video, a 120° V angle is very wide, and you might as well use a boxer 6 at this point. For a 90° odd-fire V6, primary balance is perfect as a 90° V-twin has perfect primary balance, and crankshaft weights can be used to balance out primary vibrations. The problem is that when you have non-split crankpins on a V engine, at least one of the firing intervals must be equal to the V-angle, and what happens in the case of an odd-fire V6 is that the engine's firing intervals alternate between 90° and 150°, as he explains in the video. (This is also why the 90° V10's used in the E60 M5, Viper, R8, and Huracan are odd-firing, as their use of a 90° V angle and non-split crankpins results in firing intervals alternating between 90° and 54°.) For 90° even-fire V6, each crank pin has a -30° split to give 120° firing intervals. Vertical imbalance is 2 * cos(90° / 2) * cos((90° - (-30°)) / 2) = sqrt(2) / 2 = 0.7071 (again relative to a peak piston primary force of 1) and horizontal imbalance is 2 * sin(90° / 2) * sin((90° - (-30°)) / 2) = sqrt(6) / 2 = 1.2247. The average of the imbalances is cos(15°) = (sqrt(6) + sqrt(2)) / 4 = 0.965925, so the crank weights are sized to generate that force. The balance shaft weights are then sized to generate a force of (sqrt(6) - sqrt(2)) / 4 = 0.258819 and are again 180° out of phase with each other. For a 60° V6 with -60° flying arms, both the horizontal and vertical imbalances are 2 * sin(60° / 2) * sin((60° - (-60°)) / 2) = 2 * cos(90° / 2) * cos((90° - (-30°)) / 2) = sqrt(3) / 2 = 0.866. This means that primary forces on a 60° V6 can be almost completely cancelled with crank weights without needing balance shafts. All 3 configurations will also have a slight secondary rocking moment, but this does not appear to be an issue in V6's as the magnitude of the vibrations is normally pretty small.
Can you make a video about the Alfa Romeo 690T in the current guilia since it has a 90 degree v angle. Also the Ferarri 296 has a 120 degree v6, would be interesting to see what you opinion is
Could easily be covered in both math and physics courses, however the average student couldn't care less. Remember you are here because this is a subject that interests you, you are in a minority. There is a reason why there are more youtubers subscribed to make up tutorials than engine dynamic tutorials.
Sadly, The depth of the Auto Tech programs in Accessible High Schools has fallen by the wayside along with Numerous explorative arts, Social studies and extra curricular activities like Horticulture, Animal Husbandry, Industrial Mechanics, Drafting and Design as well as Carpentry, Masonry and Weapons education. Instead of learning how the world works and why, and being able to seek out the experience in a welcoming environment with their peers, they have been left to their own devices, thus staring into another device in their hands while being fed easily retained information that is in many ways absent of relativity. . I fear for our Kids Children.
@@d4a question: couldnt you make a v6 without splay using a 60 degree angle? I was thinking you could use a firing order more similar to a v8? Just wondering since i dont have time or resources to figure this out myself.
It's an interesting way to explain stuff, by bringing up problems and explaining how to fix them, love these videos! If possible, throw in a rotary engine, when you'll talk about balancing again :D
Well, the latest Maserati V6 (the 'Nettuno' engine for their upcoming Maserati MC20) is a 90deg V6 without balance shafts, so maybe it can be done, contrary to what this video might want you to believe.
@@raoulrr the original Chevy 90°V6 didn't have balance shafts either (the 200 and the 229). Once it went up to the 262/4.3, balance shafts were finally added
One of the very best engines for a hot rod Willys Jeep is the old 225 Odd Fire. They fit well, are torquey, powerful, quick, run cool, and don't know how to stall. When Buick's new manager sought to dump the Fireball 6 they sold it to Kaiser, who gave them heavier flywheels, dubbed them 'Dauntless', and mounted them in Jeeps and Jeepsters. When AMC bought Jeep from Kaiser they sold the V6 back to GM where it was eventually fitted with the split cranks, then increased to 231 cubic inches and built by the zillions.
I highly appreciate your effort in all those videos and that you smack so many informations that are pretty much well digestable inside em. Thats the stuff YT and the world needs (or at least i need it lol) keep em coming. I'm staying here... this stuff is pure gold
"Nobody really gets engine balance the first time." You explained it well enough I got it the first time. 120° popping up again. Just so happens to be the natural angle of hexagons. Wich generally provide better balance and structure.
This channel and engineering explained are really so valuable to people who actually care about this type of stuff. Explained perfectly and never boring while doing it
I love this video! Your explanation helps me better understand the imbalance in the Buick 231. I was working on these things in my younger years, knew they were rough running, even knew they were the offspring of their v8 cousins (evident in the distributor cap), I just never saw an explanation as detailed as yours, thanks!
I have a 225ci odd fire Buick in my old Willys Jeep, such a neat engine. One thing to mention, the flywheel is like +70 lbs. I’m not sure if this helps the off balance issues, but it does give it tractor-like torque. Great video, and great explanation!
The flywheel mass is to add rotational inertia to smooth out the effect of the uneven firing intervals; it is not related to balance. It also does not increase torque, but it makes torque delivery at low speed more acceptable.
@@Skythedragon i think its not bc of a technical issue but i think its just bc it has never been made before, and the holy grail of rotarys aka the 787B had 4 rotors so why bother having more ? And you can already see crazy power outputs (1400) on 2 rotarys, having more seems overkill
I really love your engine balance video's they made me fall in love with the inline six design. I have a request though, can you please make a video comparing the inline six with the v12 engine configuration, explaining why the added cillinders help the smoothness of the engine. I really hope you cover that one day. Keep up the good work man. Cheers!
It's almost a inline six. They are like a 20 or 40° v6. I believe they also have one head. VW did it to make a high power compact v6 for the Golf. I believe it's also partly responsible for the design of the (vw owned) Bugattis W14 being possible.
Very nice video, glad to see you are continuing the engine balance videos. Will be interesting to see the big boys like v8 vs v12 and even the i8. Keep the good work and stay safe 🙂
Definitely want to learn about the VR6! My son has a Mk4 VR6 Jetta that snapped the eccentric shaft gear and was toasted after that. We're currently putting a new engine in it but it's winter time and I don't have a garage! The process is slow...
@@guidoheeling1179 his is the 12 valve VR6 and it moves! In our engine replacement endeavor we're also redoing the exhaust (header, straight through to a turd cutter muffler) and a tune and a few bits bobs. It's a manual transmission so it should be a fun little car!
@@4BillC nice! I have a 10 valve, i think they sound better than the newer engines, also a manual with a nice exhaust, i have a milltek catbacl on my golf, nice deep sound with some real troat uptop, not too much drone
Beauty, nice focus on important aspects. I don't know what a dialect that is, but it's well pronounced and understandable. I think some teachers of technically focused high schools can highly benefit from using your videos even directly in classes. Technical part nicely graphicaly explained with nice english training involved. I'm glad to be subscribed. Keep it up.
Lovely video with a newbie-proof explanation of everything that's interesting and useful enough to know. Just one bit of advice... You should consider either standing or showing your body like a newscaster would. Your hands that enter and leave the frame aren't the best solution video production wise :)
Man, I’m 1.29 minutes in the video, and I just understood secondary inbalances even tho I had already watch other videos since many time and never understood it. Thanks man, I’m pretty sure the rest of the video will be as interesting !
The new Alfa Romeo 2.9 is a 90 degree V6 that uses odd-firing (90-150-90-150-90-150) of 1-6-3-4-2-5. It's why it sounds so different from other current V6s. It has no balance shafts and its shared crankpins are not offset, it 'rocks' a little bit at idle but is super smooth all the way to redline; they appear to have accomplished this by 'overbalancing', any thoughts on this type of engine balance?
This is the exact information that I was missing to understand crankshaft and flywheel balancing of the Alfa V6. It is much clearer now why the crank itself cannot be lightened and why only the complete rotating assembly can be balanced and lightened (with bobweights). Thank you!!! Also, maybe you could make a guide for each type of engine about lightening the crank, flywheel and balancing to add power, free revving and smoothness?
Hmm… what if we took a 90° V6 and gave it 90°-split crankpins, set up to make each pair of opposing pistons mirror each other’s movements? This would give it a firing order very similar to if not the same as a boxer-6 (like in the Porsche 911). Then, we have the crankshaft counterweights set to be a bit heavy at bottom dead-center and a bit light at top dead-center. Then add a balance shaft and time it to help the counterweights at top dead center and cancel out the excess counterweight at bottom dead center. Would that be balanced? Can it work?
Radial engines were well used for airplanes in WW2 mainly because their structure could provide great heat dissipation while still being air cooled. In fact part of the air mass moved by the propeller can be easily ducted towards engine cylinders and heads, providing cooling at any time. From a balancing point of view a radial engine is the perfect example of smooth and even firing engine. The only issues are size (a marginal problem on aircrafts) and a limited torque and rpm capability, mainly due to the main connecting rod.
Well some may agree or disagree but the VR6 isn’t a vee or technically inline. It’s basically a W6 hence the Audi W12. Which is guess would be like a extremely tight Double V engine. But whatever. So yeah, looking forward to your next vid on that subject. 🎊
Truly the best explanation for a common man to understand.. You are a gem of value to the engineering students. What made it simple for us to understand was the pictures and animations which made us relate to your explanation. thank you
The 120° V6 is now used both by McLaren and Ferrari because you can mount 2 turbos on top of the engine, making is more compact than a 60° twin-turbo V6.
The only engine smoother than this is the inline 8 with it firing every 90° so there’s an overlap of 90° which is extremely smooth maybe a little overkill.
Damn, these videos are my go-to when I need to understand anything related to cars. I've spent many years modding engines, but I never really knew about why the engines were built like they were. Excellent videos that you make =)
Excellent explanation. As a veteran mechanic I had to always contend with those horrible Buick V-6 engines. My sister's 1976 Buick Skyhawk broke the crankshaft in 2, like so many others. How ironic, that the Buick 3800 would become one of the best engines of all time.
Just one key note. The 60 degree V6 was developed by Francesco de Virgilio at Lancia and is iconic to the brand! Oh, it also used one cylinder head, instead of two. Lancia was ahead of it's time for most of the company life.
A VR or W (VV) is just a narrow V or a pair of narrow V, with shared crank hence VV or if you're a cheeky German W. A true W engine has three banks but I digress. So a VR4 is really a V4 with a very narrow V using a single head. The W8 is a pair of those VR4 in a V configuration again V V the W is play on the letters. It's design is all about compactness and makes compromises everywhere else. You have asymmetrical intake and exhaust runner for every other cylinder, have to use a split pin crank too. In practice they are under square, small bore long stroke good for torque not so much for power, they don't like to rev. Before you think but what about the W16 in the Bugatti, it's quad turbo 8L. You can make that kind of power with LSx even match the displacement with half the weight and only two turbo's. By half we're talking about 250kg or about 500lbs less. More over the LSx will likely be more reliable and last longer.
Thanks bro. Waiting for V8, V10, V12 & W16. I think there is nothing better than I6, but twice I6 is better, V12. And also what about Porsche opposite 6 cyl
Another spectacularly detailed explanation of a complex subject that we (the learning laymans) can wrap our heads around. Love it! And thank you as always for taking the time to educate us!
Ok, so a Ducati V twin is turbine smooth but with uneven firing.... can these not simply be triples up? I've often wondered this, particularly as 4 cylinder motorbikes such as the R1 have uneven firing, Great videos. I've watched your engine balance video, but will need to return to it!
V twins as any another V engine add a factor in rotating mass balancing that just make things more complicated. When you have few number of cylinder, balancing is way more important than even firing. There are some arrangements that work well on crank mechanism of the V engine that basically follows this formula: [(V angle) × 2] - 180 = (split pin angle)
More power stroke overlap, smoother power delivery with less pulsation. Different number of cylinders and equal displacement also means different bore and stroke so you also get different power and torque characteristics (not necessarily more of any, just different). Downsides? More moving parts, more friction, physically larger engine, likely also worse economy.
Frankly, I'm amazed that V6 crankshafts with splayed crank pins aren't weak brittle garbage. It must be some impressive metallurgy to make such a sketchy design robust.
Great Video! I was hoping it would show the different engine balances between a V6, V8, and V10. And how much of a difference it would be with a flat-plane crank compared to a cross-plane. Guess ill have to wait for future videos.
Wow. Explaining engineering in ways that we can all understand is just not talent..it's an art!!! Now I understand why my sister's 1976 V6 Buick Regal shook like mad and my 78 downsized Regal was smooth! Thanks.
I’ve always wondered why BMW made their halo S85 V10 a 90 degree engine. Guessing it must have lots of counterweights to smooth out it’s inherit imbalance. 72 degrees would likely have been the smoothest setup here?
i6 has always been my personal favorite engine. They're smooth, and they sound great! Only thing better is a v12... which is basically two i6 slapped together.
@@francoisthailande2440 A V12 can be any angle, it's just about packaging even 180, like the flat 12 Ferrari used in the Testarossa and Boxer which ironically wasn't a boxer engine but a flat V12.
So A 90° V6... Does The Balance Shaft (If Equipped) Reduce Vibrations That Could Wear Main Bearings? My 3800 V6 Had One From Factory. In Order To Run A Dual Roller Timing Chain (cam in block engine) The Balance Shaft Gear Needs To Be Removed And You Dont Run A Balance Shaft. Is The Balance Shaft A "Cosmetic" Engine Balance Feature Or Is It Crucial To Engine Life????
The claimed problem with the 120 degree V6 is packaging, but packaging - in a hot-vee configuration - is exactly why it was chosen for the Ferrari and McLaren engines.
I left my Probe GT with the Mazda KLDE 60 degree V6 running one day when I was half-asleep and stumbled into work that winter morning. It was so smooth running that 8 hours later when I got back in the car, I tried to start it and ground the starter after it had been turning all day.
:( You utterly ignore the best 6: THE FLAT SIX! The self-balancing flat-six is the lightest power unit you could possibly build, without chopping off two cylinders and making a Subaru motor. :P The old straight-6 is essentially British, and therefore stupid. The V6 is decent and sounds OK, and it works a treat. But, a twin-turbocharged flat-six is THE ultimate engine. Now, you could take a tiny little 2-litre flat-six, strap two lovely modern boosty turbos to it, put it in the back of a small coupe, and use that power to drive the rear wheels. In the front, to make up some better weight distribution you put in a 50-litre fuel tank and 20KW/h battery which drives the front wheels if you want it to, or if it needs to, or if you gouge on the go-pedal. You'd put some regenerative braking, and regenerative stuff on the crank, and use that to charge the batteries. You'd make it all out of carbon fibre of course, and your goal would be to make a car which weighs less than 1,500kg, has 400bhp at the back, and 200bhp at the front, and has an electric-only range of about 60km or so. Call it the "119". :)
Looks at inline 6 and it perfect balance, looks at v6 and all it's goofy timing and balance issues. 😑....(rubs forehead) bruh...just make your car's nose like 6 inches longer.
well , actually there is a VW ,V5 engine ,it is very similar to the V6 , the one of 15 degrees angle between the cylinders with a single head , but with one cylinder missing , I have seen it in a VW bora while living in London ... look for it in Wikipedia or VW web site perhaps ... I have rebuilt the 6 cyl couple of times ,but never the one of 5 cyl ...
@@olyvertwist07 I know and love the V5! such an interesting concept. I just thought a video on a theoretical V7 or V9 engine for balance might be a cool idea!!
Thank you for making those so well explained engineering system. I had headache just thinking on how V6 can be balanced. Keep up the good job You rock Dude #FromMadagascar
So they had to really over engineer a v6 to get the power of a I6,it is no wonder why the v6 dont have a long life, I6 tend to run 30 years, v6 your lucky to get 8
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(Posting this here so that hopefully people will see it) I'd like to add a few extra points in addition to what you pointed out in the video:
Most people don't know this, but another reason that most V6's are 60° is because this V angle offers perfect primary balance while maintaining even firing intervals.
120° and 90° even fire V6 have bigger horizontal imbalances than vertical for each pair of cylinders resulting in a rocking moment. If the peak primary force of each piston is 1, the peak horizontal and vertical imbalances are 1.5 and 0.5 respectively for a 120° V6. The crank weights are sized to balance out the average of the imbalances so that the remaining imbalance is circular. In this case the remaining imbalance has magnitude 1, so a single balance shaft generating a force of 0.5 (with weights 180° out of phase) would have to be used. But as D4A mentions in the video, a 120° V angle is very wide, and you might as well use a boxer 6 at this point.
For a 90° odd-fire V6, primary balance is perfect as a 90° V-twin has perfect primary balance, and crankshaft weights can be used to balance out primary vibrations. The problem is that when you have non-split crankpins on a V engine, at least one of the firing intervals must be equal to the V-angle, and what happens in the case of an odd-fire V6 is that the engine's firing intervals alternate between 90° and 150°, as he explains in the video. (This is also why the 90° V10's used in the E60 M5, Viper, R8, and Huracan are odd-firing, as their use of a 90° V angle and non-split crankpins results in firing intervals alternating between 90° and 54°.)
For 90° even-fire V6, each crank pin has a -30° split to give 120° firing intervals. Vertical imbalance is 2 * cos(90° / 2) * cos((90° - (-30°)) / 2) = sqrt(2) / 2 = 0.7071 (again relative to a peak piston primary force of 1) and horizontal imbalance is 2 * sin(90° / 2) * sin((90° - (-30°)) / 2) = sqrt(6) / 2 = 1.2247. The average of the imbalances is cos(15°) = (sqrt(6) + sqrt(2)) / 4 = 0.965925, so the crank weights are sized to generate that force. The balance shaft weights are then sized to generate a force of (sqrt(6) - sqrt(2)) / 4 = 0.258819 and are again 180° out of phase with each other.
For a 60° V6 with -60° flying arms, both the horizontal and vertical imbalances are 2 * sin(60° / 2) * sin((60° - (-60°)) / 2) = 2 * cos(90° / 2) * cos((90° - (-30°)) / 2) = sqrt(3) / 2 = 0.866. This means that primary forces on a 60° V6 can be almost completely cancelled with crank weights without needing balance shafts.
All 3 configurations will also have a slight secondary rocking moment, but this does not appear to be an issue in V6's as the magnitude of the vibrations is normally pretty small.
In summary.. the FLAT 6 is the perfect engine.
I have a 4.0 straight-six and a 225 Buick V6 odd fire. Thank you so much for the information.
I would like to see you cover at this mess
ruclips.net/video/0_Kf-7kg6Ek/видео.html
Can you make a video about the Alfa Romeo 690T in the current guilia since it has a 90 degree v angle. Also the Ferarri 296 has a 120 degree v6, would be interesting to see what you opinion is
I wish there was a separate subject called "automotive engineering" in school and you were my teacher
There was at the school I went to
@@brentonellis213 👀 I want to go to your school
Could easily be covered in both math and physics courses, however the average student couldn't care less. Remember you are here because this is a subject that interests you, you are in a minority. There is a reason why there are more youtubers subscribed to make up tutorials than engine dynamic tutorials.
Mechanical engineering is the closest you'll find in most schools, there are specific automotive engineering programs but then you're limited on jobs
Sadly, The depth of the Auto Tech programs in Accessible High Schools has fallen by the wayside along with Numerous explorative arts, Social studies and extra curricular activities like Horticulture, Animal Husbandry, Industrial Mechanics, Drafting and Design as well as Carpentry, Masonry and Weapons education. Instead of learning how the world works and why, and being able to seek out the experience in a welcoming environment with their peers, they have been left to their own devices, thus staring into another device in their hands while being fed easily retained information that is in many ways absent of relativity. . I fear for our Kids Children.
Bru this is really a legit video, we the unwashed masses really appreciate it. ❤️
I'm not very washed myself
who the f is unwashed masses here? talk about lame self deprication humor attempt
Now you are washed with this videos knowledge.
@@lordjaashin its a term he uses in his videos get educated before you make stupid comments.
@@d4a question: couldnt you make a v6 without splay using a 60 degree angle? I was thinking you could use a firing order more similar to a v8? Just wondering since i dont have time or resources to figure this out myself.
It's an interesting way to explain stuff, by bringing up problems and explaining how to fix them, love these videos! If possible, throw in a rotary engine, when you'll talk about balancing again :D
I dont think rotary would have primary imbalance
Every Wankel engine is perfectly balanced.
@@andyharman3022 So they said: ruclips.net/video/ElkuWqhL9V8/видео.html
That is a cool engine! If you like rpms! Thats the engine for you!
O tom pochybuji. Není to klasická rotace, ale šmatlavý motor, který potřebuje vavážení. Proto se asi dělá min. dvourotorový.🤔
Nobody:
Buick: let’s defy physics
Well, the latest Maserati V6 (the 'Nettuno' engine for their upcoming Maserati MC20) is a 90deg V6 without balance shafts, so maybe it can be done, contrary to what this video might want you to believe.
The old buick V6 and ecotec is one of the most reliable engines ever made.
@@raoulrr the original Chevy 90°V6 didn't have balance shafts either (the 200 and the 229). Once it went up to the 262/4.3, balance shafts were finally added
@@raoulrr interesting then how he literally says you don't need a balancing shaft.
One of the very best engines for a hot rod Willys Jeep is the old 225 Odd Fire. They fit well, are torquey, powerful, quick, run cool, and don't know how to stall.
When Buick's new manager sought to dump the Fireball 6 they sold it to Kaiser, who gave them heavier flywheels, dubbed them 'Dauntless', and mounted them in Jeeps and Jeepsters. When AMC bought Jeep from Kaiser they sold the V6 back to GM where it was eventually fitted with the split cranks, then increased to 231 cubic inches and built by the zillions.
"he never talks about the strange Alfa v6..."
Oh shit, here it is!! 😂 Beautiful!
He has a special video dedicated to Busso's wonder ❤.
@@killerdinamo08 where??? :D
@@flaviopk50s Drat, I've mistaken him with an Italian guy who made a video about it, I beg your pardon ✌.
@@killerdinamo08 Confused him with Roadster Life eh ?
@@nvl2691 Right you are 😉.
Looking forward to the flat-6 and VR6 videos. :)
Yup, I have 300ps 3.6L VR6 with 10,6° angle, so Im waiting with you :D
I almost commented that
If only nissan didn't suck hey
I highly appreciate your effort in all those videos and that you smack so many informations that are pretty much well digestable inside em. Thats the stuff YT and the world needs (or at least i need it lol) keep em coming. I'm staying here... this stuff is pure gold
"Nobody really gets engine balance the first time."
You explained it well enough I got it the first time. 120° popping up again. Just so happens to be the natural angle of hexagons. Wich generally provide better balance and structure.
To quote CGP Gray "Hexagon is Bestagon!"
Further showing that indeed, hexagons are the bestagons.
🅱️exagon
Your videos keep oozing with Infos....keep it up bro!!!!
EXCELLENT VIDEO AS ALWAYS PLEASE DO A VIDEO ABOUT THE TYPES VALVE LIFTERS HYDRAULIC ETC...
THANK YOU
This is extremely interesting! I wish some day you'll make a video about a V8 - e.g. crossplane / flat plane
BUSSO V6 FTW :)
ohno
BUSSO, not buso
@@Random-nf7qb u right, fixed it
This channel and engineering explained are really so valuable to people who actually care about this type of stuff. Explained perfectly and never boring while doing it
I love this video! Your explanation helps me better understand the imbalance in the Buick 231. I was working on these things in my younger years, knew they were rough running, even knew they were the offspring of their v8 cousins (evident in the distributor cap), I just never saw an explanation as detailed as yours, thanks!
As a kid my buddy had a 231v6 In a jeep commando pickup, and I did really know about V° or anything, I just remember it had a distinct sound idling
I have a 225ci odd fire Buick in my old Willys Jeep, such a neat engine. One thing to mention, the flywheel is like +70 lbs. I’m not sure if this helps the off balance issues, but it does give it tractor-like torque. Great video, and great explanation!
The flywheel mass is to add rotational inertia to smooth out the effect of the uneven firing intervals; it is not related to balance. It also does not increase torque, but it makes torque delivery at low speed more acceptable.
You are so incredibly talented plain and simple!!
Can you make a video on detailed explanation of Wankel rotary engines
Yeh, also about balancing.
I wonder why there are no 5-rotors
@@Skythedragon i think its not bc of a technical issue but i think its just bc it has never been made before, and the holy grail of rotarys aka the 787B had 4 rotors so why bother having more ? And you can already see crazy power outputs (1400) on 2 rotarys, having more seems overkill
@@ntwx2137 There are 6 rotors, so I'm wondering if 5 rotors are physically possible or not
@@Skythedragon oh ok i didn't know that
@@ntwx2137 There's even a 12-rotor, but it's 3 4-rotors connected via gears by the looks of it
(ruclips.net/video/Qcgg7w6TFQc/видео.html)
I really love your engine balance video's they made me fall in love with the inline six design. I have a request though, can you please make a video comparing the inline six with the v12 engine configuration, explaining why the added cillinders help the smoothness of the engine. I really hope you cover that one day.
Keep up the good work man. Cheers!
The v12 will definitely be covered eventually
I had to stop in the middle of the video to write a comment because this is THE BEST video explanation of the said matter! Congratz!
You are such an incredibly good teacher.
But how does a VR6 work?
It's almost a inline six. They are like a 20 or 40° v6. I believe they also have one head. VW did it to make a high power compact v6 for the Golf. I believe it's also partly responsible for the design of the (vw owned) Bugattis W14 being possible.
Very nice video, glad to see you are continuing the engine balance videos. Will be interesting to see the big boys like v8 vs v12 and even the i8. Keep the good work and stay safe 🙂
Math test belike: name the offset between pistons of a 2-stroke inline 7
I think its about 51.4 degrees
Always seem to know how to make education videos entertaining and interesting. Really enjoy the content, love from NZ :)
This is the first explanation of odd firing vs even firing that I’ve actually understood! Thanks :-)
Shout out to the busso V6 !!
Definitely want to learn about the VR6! My son has a Mk4 VR6 Jetta that snapped the eccentric shaft gear and was toasted after that. We're currently putting a new engine in it but it's winter time and I don't have a garage! The process is slow...
i dig the VR platform, have a VR5 myself, its a little different, but interesting for shure!
@@guidoheeling1179 his is the 12 valve VR6 and it moves! In our engine replacement endeavor we're also redoing the exhaust (header, straight through to a turd cutter muffler) and a tune and a few bits bobs. It's a manual transmission so it should be a fun little car!
@@4BillC nice! I have a 10 valve, i think they sound better than the newer engines, also a manual with a nice exhaust, i have a milltek catbacl on my golf, nice deep sound with some real troat uptop, not too much drone
@@guidoheeling1179 good stuff!
A perfect video, right on time for the reveal of the McLaren Artura and it's hot-V 120 degree V6!
Beauty, nice focus on important aspects. I don't know what a dialect that is, but it's well pronounced and understandable. I think some teachers of technically focused high schools can highly benefit from using your videos even directly in classes. Technical part nicely graphicaly explained with nice english training involved. I'm glad to be subscribed. Keep it up.
As usual, my daily goal of learning something new is fulfilled by watching your videos. Thanks :)
And what about Opel's 54° V6?
This really explains why the Buick V6 was such an odd duck. 😀🤓
Ayyy, buick 3800 is a thing of beauty
3800 series one , no balance shaft .
3800 series II ( 2 ) . Has a balance shaft .
Lovely video with a newbie-proof explanation of everything that's interesting and useful enough to know. Just one bit of advice... You should consider either standing or showing your body like a newscaster would. Your hands that enter and leave the frame aren't the best solution video production wise :)
This is my new favorite car youtube channel. Your voice is so calming I literally started falling asleep.
Amazing work ! Your videos never disappoints !
To all the Inlines-6s I've loved before...
Was about to ask you about vr6 and flat 6 but you answered it in the end hehe
Thank you for watching until the end. Everyone's asking without watching.
Thank you for this great educating video! As you mentioned in the video, I look forward to see the comparison with the VR6 engine.
I second this
This is the only way the word "fired" is used in a good way.👍🇺🇲
IN LINE SIX is the Way To Go...balanced.. more torque..more HP..my Ford 300 cubic inch is a 🐎 Workhorse 🐴
Ford 300 inline 6
Chevy 292 i6
Slant 170 i6
All a testament to being the absolute most reliable engines and cheapest to work on ever
Man, I’m 1.29 minutes in the video, and I just understood secondary inbalances even tho I had already watch other videos since many time and never understood it. Thanks man, I’m pretty sure the rest of the video will be as interesting !
The new Alfa Romeo 2.9 is a 90 degree V6 that uses odd-firing (90-150-90-150-90-150) of 1-6-3-4-2-5. It's why it sounds so different from other current V6s. It has no balance shafts and its shared crankpins are not offset, it 'rocks' a little bit at idle but is super smooth all the way to redline; they appear to have accomplished this by 'overbalancing', any thoughts on this type of engine balance?
This is the exact information that I was missing to understand crankshaft and flywheel balancing of the Alfa V6. It is much clearer now why the crank itself cannot be lightened and why only the complete rotating assembly can be balanced and lightened (with bobweights). Thank you!!!
Also, maybe you could make a guide for each type of engine about lightening the crank, flywheel and balancing to add power, free revving and smoothness?
I've been trying to figure all this out for 30 years and never quite got there. THANK YOU!
Hmm… what if we took a 90° V6 and gave it 90°-split crankpins, set up to make each pair of opposing pistons mirror each other’s movements? This would give it a firing order very similar to if not the same as a boxer-6 (like in the Porsche 911). Then, we have the crankshaft counterweights set to be a bit heavy at bottom dead-center and a bit light at top dead-center. Then add a balance shaft and time it to help the counterweights at top dead center and cancel out the excess counterweight at bottom dead center.
Would that be balanced? Can it work?
I am really interested in radial engine balance, as they where wildly used in ww2 aviation.
Yeah this would be a nice vid too
Radial engines were well used for airplanes in WW2 mainly because their structure could provide great heat dissipation while still being air cooled. In fact part of the air mass moved by the propeller can be easily ducted towards engine cylinders and heads, providing cooling at any time.
From a balancing point of view a radial engine is the perfect example of smooth and even firing engine. The only issues are size (a marginal problem on aircrafts) and a limited torque and rpm capability, mainly due to the main connecting rod.
Well some may agree or disagree but the VR6 isn’t a vee or technically inline. It’s basically a W6 hence the Audi W12. Which is guess would be like a extremely tight Double V engine. But whatever. So yeah, looking forward to your next vid on that subject. 🎊
Truly the best explanation for a common man to understand.. You are a gem of value to the engineering students. What made it simple for us to understand was the pictures and animations which made us relate to your explanation. thank you
The 120° V6 is now used both by McLaren and Ferrari because you can mount 2 turbos on top of the engine, making is more compact than a 60° twin-turbo V6.
I love these videos. My dream car is a 1949 Buick Roadmaster. Would it be possible to perform an analysis of its inline 8?
I Love These Engine Balance Videos I Really Do.
you explain stuff better than the guy in engineering explained
A hundred percect. He better start doing animations.
But his explaination alone is great.
The only engine smoother than this is the inline 8 with it firing every 90° so there’s an overlap of 90° which is extremely smooth maybe a little overkill.
Damn, these videos are my go-to when I need to understand anything related to cars. I've spent many years modding engines, but I never really knew about why the engines were built like they were. Excellent videos that you make =)
Excellent explanation. As a veteran mechanic I had to always contend with those horrible Buick V-6 engines. My sister's 1976 Buick Skyhawk broke the crankshaft in 2, like so many others. How ironic, that the Buick 3800 would become one of the best engines of all time.
And of course the PRV V6 was a 90 degree V6, a cut down version of a V8 that was mooted, but never actually go made!
Just one key note. The 60 degree V6 was developed by Francesco de Virgilio at Lancia and is iconic to the brand! Oh, it also used one cylinder head, instead of two. Lancia was ahead of it's time for most of the company life.
Awesome video D4A! I'm super impressed with your ability to explain and educate.
Thanks my man!
Awesome video very well explained.. makes me want to build a inline 6 motor ..
Was waiting this one!
Awesome! Great information thank you. I can’t wait to hear about the VR6😎
A VR or W (VV) is just a narrow V or a pair of narrow V, with shared crank hence VV or if you're a cheeky German W. A true W engine has three banks but I digress.
So a VR4 is really a V4 with a very narrow V using a single head. The W8 is a pair of those VR4 in a V configuration again V V the W is play on the letters. It's design is all about compactness and makes compromises everywhere else. You have asymmetrical intake and exhaust runner for every other cylinder, have to use a split pin crank too. In practice they are under square, small bore long stroke good for torque not so much for power, they don't like to rev. Before you think but what about the W16 in the Bugatti, it's quad turbo 8L. You can make that kind of power with LSx even match the displacement with half the weight and only two turbo's. By half we're talking about 250kg or about 500lbs less. More over the LSx will likely be more reliable and last longer.
cant believe i understand everything hes saying
He's so dang good and simplifying a topic and presenting in a totally logical way
Thanks bro. Waiting for V8, V10, V12 & W16. I think there is nothing better than I6, but twice I6 is better, V12. And also what about Porsche opposite 6 cyl
Porsche and Hondas flatsix is crossplane.
Another spectacularly detailed explanation of a complex subject that we (the learning laymans) can wrap our heads around. Love it! And thank you as always for taking the time to educate us!
Ok, so a Ducati V twin is turbine smooth but with uneven firing.... can these not simply be triples up? I've often wondered this, particularly as 4 cylinder motorbikes such as the R1 have uneven firing, Great videos. I've watched your engine balance video, but will need to return to it!
V twins as any another V engine add a factor in rotating mass balancing that just make things more complicated. When you have few number of cylinder, balancing is way more important than even firing. There are some arrangements that work well on crank mechanism of the V engine that basically follows this formula: [(V angle) × 2] - 180 = (split pin angle)
Great vid! Makes me appreciate this j30a5 that im dailying that much more!
What about VR6 ? It has only 10,6°
Let’s say you have a 3.0 liter v6 and a 3.0 liter v8. What’s the benefit of having the 2 extra cylinders when displacement is the same?
More power stroke overlap, smoother power delivery with less pulsation. Different number of cylinders and equal displacement also means different bore and stroke so you also get different power and torque characteristics (not necessarily more of any, just different). Downsides? More moving parts, more friction, physically larger engine, likely also worse economy.
I owned a Mercedes 2.8 L6, A Lexus 3.0 L6 and an Alfa Romeo 3.0 V6. All great 6-bangers, the Lexus L6 being the best.
Well it is a JZ.
@@ItsDaJax Yup! Those are the best. 😎
Careful about the audio, resonating ring throughout the vid. Great vids overall . Keep up the good work
Close mic is the key. Yes, he needs a close mic.
So does the Jesko engine use the same balanced flywheel idea?
u know this was the kind of stuff that kept me up at night so thanks for making a video about it
Frankly, I'm amazed that V6 crankshafts with splayed crank pins aren't weak brittle garbage. It must be some impressive metallurgy to make such a sketchy design robust.
man i admit that you're super underrated
Great explanations, and your animations are great !!!!
Great Video! I was hoping it would show the different engine balances between a V6, V8, and V10. And how much of a difference it would be with a flat-plane crank compared to a cross-plane. Guess ill have to wait for future videos.
Thanks, been waiting for this one and also looking forward to the other two videos on the topic
Rotary fans: We have the smoothest engine 🤣😂🤣
Also rotary fans: But not for more than 50-70k km, then we won't have compression any more ;-)
@@stefanguels that´s pretty good going, I was thinking more like bang, oops...
Wow. Explaining engineering in ways that we can all understand is just not talent..it's an art!!! Now I understand why my sister's 1976 V6 Buick Regal shook like mad and my 78 downsized Regal was smooth! Thanks.
Id love to have one episode about the V10.
I’ve always wondered why BMW made their halo S85 V10 a 90 degree engine. Guessing it must have lots of counterweights to smooth out it’s inherit imbalance. 72 degrees would likely have been the smoothest setup here?
10-15 ° single head v6 gang
I stand corrected to what I said in the last 6 Cylinder Balance video!! 😵😳 You covered the odd fire V6 brilliantly!
i6 has always been my personal favorite engine. They're smooth, and they sound great! Only thing better is a v12... which is basically two i6 slapped together.
60 or 90 degrees V12?
@@francoisthailande2440 A V12 can be any angle, it's just about packaging even 180, like the flat 12 Ferrari used in the Testarossa and Boxer which ironically wasn't a boxer engine but a flat V12.
@@ineffable1129 how can it be both?
use darker background. its too bright.
You just made it so I can teach this to kids and I thank you
So A 90° V6... Does The Balance Shaft (If Equipped) Reduce Vibrations That Could Wear Main Bearings? My 3800 V6 Had One From Factory. In Order To Run A Dual Roller Timing Chain (cam in block engine) The Balance Shaft Gear Needs To Be Removed And You Dont Run A Balance Shaft. Is The Balance Shaft A "Cosmetic" Engine Balance Feature Or Is It Crucial To Engine Life????
“the 120 degree V6 is useless and stupid”
Ferrari: hold my beer
The claimed problem with the 120 degree V6 is packaging, but packaging - in a hot-vee configuration - is exactly why it was chosen for the Ferrari and McLaren engines.
Thank u so much sir for this valuable information which makes this alien technology more understandable. Thank u so much...
I left my Probe GT with the Mazda KLDE 60 degree V6 running one day when I was half-asleep and stumbled into work that winter morning. It was so smooth running that 8 hours later when I got back in the car, I tried to start it and ground the starter after it had been turning all day.
:( You utterly ignore the best 6: THE FLAT SIX!
The self-balancing flat-six is the lightest power unit you could possibly build, without chopping off two cylinders and making a Subaru motor. :P
The old straight-6 is essentially British, and therefore stupid.
The V6 is decent and sounds OK, and it works a treat.
But, a twin-turbocharged flat-six is THE ultimate engine.
Now, you could take a tiny little 2-litre flat-six, strap two lovely modern boosty turbos to it, put it in the back of a small coupe, and use that power to drive the rear wheels. In the front, to make up some better weight distribution you put in a 50-litre fuel tank and 20KW/h battery which drives the front wheels if you want it to, or if it needs to, or if you gouge on the go-pedal.
You'd put some regenerative braking, and regenerative stuff on the crank, and use that to charge the batteries.
You'd make it all out of carbon fibre of course, and your goal would be to make a car which weighs less than 1,500kg, has 400bhp at the back, and 200bhp at the front, and has an electric-only range of about 60km or so.
Call it the "119". :)
Oh my God!! I wish you were my teacher in real life. Thanks dude, as a mechanical engineering student, this expands my knowledge. 🙏❤❤
The inline 6 is by far my first pick.
Shyt, this is so damn comprehensive, oh my, time well spent! Thanx!
Looks at inline 6 and it perfect balance, looks at v6 and all it's goofy timing and balance issues.
😑....(rubs forehead) bruh...just make your car's nose like 6 inches longer.
This is random, but could you do a video on a V9 engine? Or possibly a V7 engine? I feel like it would be a cool theoretical experiment
well , actually there is a VW ,V5 engine ,it is very similar to the V6 , the one of 15 degrees angle between the cylinders with a single head , but with one cylinder missing , I have seen it in a VW bora while living in London ... look for it in Wikipedia or VW web site perhaps ... I have rebuilt the 6 cyl couple of times ,but never the one of 5 cyl ...
@@olyvertwist07 I know and love the V5! such an interesting concept. I just thought a video on a theoretical V7 or V9 engine for balance might be a cool idea!!
excellent video, thanks. awaiting flat and boxer :)
Wait no more: ruclips.net/video/mTS48jX68YU/видео.html
Thank you for making those so well explained engineering system.
I had headache just thinking on how V6 can be balanced.
Keep up the good job
You rock Dude
#FromMadagascar
So they had to really over engineer a v6 to get the power of a I6,it is no wonder why the v6 dont have a long life, I6 tend to run 30 years, v6 your lucky to get 8