What is a Jake Brake and How Does it Work?
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- Опубликовано: 5 апр 2022
- A Jacob's brake, jake brake, compressions release brake, whatever you want to call it, is actually fairly simple in how it works. To put it really simply, it just uses the engine's compression against itself to slow down the engine speed and ultimately slow down the vehicle.
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Diesels do so have engine braking. more engine braking than gasoline engines; though much more still with the Jake brake, which is useful when running as much as 250 lbs per horsepower.
...and now for the skill-testing question:
_Why do they call it a "Jake" brake?_ 🤪
Ummmm, i got a BIG hammer smashed the like button...now i can't watch anymore videos on this phone/device...😬 🤭 oops
@@MickPsyphon because Jacob’s is the name of the company that makes it. There are other brands, Blue Ox, Williams, although those names are probably relics of the past. There are exhaust brakes, essentially closing the exhaust off. And there are engine brakes, that basically turn the engine into an air compressor.
pumpkin time
Studies have proven that the sound of a Jake Brake is significantly quieter then the sounds of a truck coming through your house or car! I live in the mountains, and love hearing trucks on the Jake!
Well of course it’s quieter then the sound of a truck coming through your house well or at least i would hope
I’m just joking dude I know what you mean
I like to hear when the driver has his foot in it and we see the burning coal, and the jake brake sounds like the laughter of children to me.
#1 comment lol amen!!
Used to be a truck driver and I still like hearing them also
Listen officer…. I can do it slow or I can do it quiet…. You can’t have both… you pick… I’ll drive the truck… you write the tickets🤙🤙
I’ve lived close to a highway for over a decade and there is nothing better than hearing a fully loaded, pre-emissions log truck hammering on the jakes.
And you want everyone to hear that sound you love whether they want to or not.
Freedumb!
@@andywomack3414 ~
Andy's pisst off and we're going to hear it also.
@@A.R.77 I don't like having to pause conversation or otherwise adjust my life due to some juvenile driver hammering their jakes on the flat highway a few hundred feet from where I live. And I feel even more ire toward the idiots who tune their puny automotive Diesels to maximize noise and smoke. And there are those masculinity-challenged men children who full throttle their pretend race cars all the time just to make some sort of stupid point about their man-hood.
@@andywomack3414 ~
"...ire toward the idiots who tune their puny automotive Diesels to maximize noise and smoke."
Well, we both agree on that one.
Worst noise ever. Especially when your local truckers do it to piss you off at 4am and they ignore the “No Jake” signs for over 15km. Idiots.
Growing up, my dad owned a grading company and at his peak he had 25 Mack trucks with belly dump trailers and 6 end dump trucks, all with Cat engines. Sometimes on days when I was off school, I’d ride around with the different drivers, or sit in the cab of a bulldozer with the operator. Sometimes they’d let me drive a big twin engine 627 Cat scraper or 953 front end loader or some other pieces while sitting on the lap of the operator. By the time I was 14, I was pulling those big Mack’s into the lube bay at the shop, doing oil changes and greasing them under supervision of one of the mechanics. I loved the sound of the Jake’s coming on, man. That quick little clip brought back many fond memories.
We had a service manager who would always pull the wire connectors OFF behind the dash. Shut of MACK engine brake. I would carry a wrench to pull off the Dash plate and hook the wire back up. If I drove the MACK dump that day.
The Kingdom of God is at Hand
John 3:16
King James Version
16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
Jake brakes. Designed by Cummins founder Clessie Cummins and was about the only thing he was able to take with him when he lost his company.
After loosing the company, he knew his financial salvation was to be the engine brake, unfortunately, he didn't have the money to build them. He went everywhere trying to come up with financing to make it happen. Finally he approached Arthur Jacobs of Jacobs drill chucks, who was thrilled by Cummins invention. He promised to bankroll the operation....one condition being his name would be front and center in all advertising and communications .hence 'Jacobs engine Brake'....or 'Jake Brake' for short
what a story, nice
Nice
Good, Cumming Brake wouldn't have been so successful
@@bioemilianowould be helpful though 😂😉
@@bioemiliano"gotta use them kum brakes"
I'm too excited that i found people who love the sound of Jake Brakes as much as I do.
The Peterbilt 🤤😍🤯😘
Engine braking is fundamentally linked with compression ratio. In Europe we can also compare this pretty easily since we often drive manual transmissions and petrol, as well as diesel cars. A diesel has a lot more engine brake compared to a petrol engine of similar size. Jake brakes, exhaust gas brakes, retarders, etc. are used only on trucks since the available engine brake would not be enough for the weak power to weight ration of a fully loaded truck.
Having driven petrol and diesel 4x4's off road, I refuse to own a petrol 4x4 because of the diesels superior engine brake, due to its high compression ratio.
I'm also a truck driver familier with exhaust brakes and engine retarders.
The point of an exhaust brake is to block air flowing out and thus increase the engines compression ratio.
These systems help a lot when you are in the WRONG GEAR.
Going down a hill in a high gear causes the transmission to over power the engines compression, hence the auxiliary braking systems to increase that compression.
The compressed air in the compression stage doesn't "spring back" all that efficiently.
Sure, it's not as effective as a Jake brake, but it's still 10x more effective then a petrol engine.
BTW, anyone who thinks a thin air intake butterfly valve is strong enough to slow a couple ton of moving vehicle on its own is an idiot.
There is a lot more physics behind it all.
Yeah. Thought the same thing. My diesel has more engine braking than a comparable gasoline engine. Only problem is that a truck wheigs a lot more and thus is accelerated a lot more downhill. So you can't compare a car, where need to bring the energy of 1.5 tons into heat, to truck where you need to convert the energy of 40 tons into heat.
@@dragonfire3289 did I forget to mention the part about where I drive trucks and auxiliary braking systems are meant to be used when you stuff up and use the wrong gear going down a hill?
Yes, trucks weight more, but they also have larger engines often with much longer bore strokes, have larger boxier aerodynamic profiles, more tires in contact with the ground etc.
All the things that hurt efficiency and fuel economy, actually help slow down a truck.
Yes they take longer to slow down and yes auxiliary braking systems help a lot, but with the correct use of the foot brakes and the right gear selection, not a single truck on this planet ACTUALLY needs Jake brakes, exhaust brakes, engine retarders etc.
@@35manning Dummy!You have never driven a fully loaded truck down a mountainous road!--Reality with the real possibility to die is different to a video game!
Same comment here. My 2.2 liter Diesel Rav4 has way better engine braking than my wife's 1.6 Petrol Kia.
Whaaaaat??? Who wouldn't love that sound??
The sound of that Jake brake is music to my ears.
Once place I lived there was a road behind my street, I'd hear trucks used their jakes all the time, always a symphony of various engines, miss that place, loved the sounds.
I live in the country! Id love to hear that symphony coming through my town! Especially that Kenworth rolling across the screen!
Same
You explain what a Jake Brake is but don't even give a real world example throughout the video. Kudos my man.
A jake brake is a really cool sound and it works when you flick the switch
I definitely DO want to hear Jake Brakes in my town. I grew up next to a hill on a major highway in Central Pennsylvania and I absolutely loved hearing those Jake Brakes all day and night!
True story: the inventor of the "Jake Brake" was one Clessie Cummins. Yes, THAT Cummins. He couldn't convince the executives at the company he founded to buy his idea, so he sold it to the Jacobs company. Hence the name.
I was litterally watching jake brake videos last night. Love me some loud jakes
During my short trucking career in the 1980’s I drove an Isuzu truck with an exhaust brake. I loved it. Thanks for the great lesson on braking.
Thanks for the excellent graphics and explanation. I’m a new CDLClass A, and looking for a dump truck to start out. This was by far the best explanation of how a Jake brake works I’ve seen.
I’ve tried watching videos on how Jake brakes work and never really got a good understanding until this video. Finally I understand Joe they work. Thanks
Greatest view at night: trucks with open stacks, with Jake brakes on, going down "the grapevine " in California in the early 80s. Flames three feet high coming out the stacks.
Thanks for this informative video! I had heard of Jake brakes and now I know how they work. I have heard the sound of a Jake brake all of my life, and I like the sound of them, as long as they aren't in my neighborhood. Good video, sir!
For those that enjoy the twisted history of diesel engines, the story of Clessie and his betrayal by the Miller family (again) led to the formation of the company we know as Jacobs, as in Jake brake. That personal story of the Jake brake is even more interesting than the Jake brake by itself. The betrayal and feud exists to this day, a century later.
And a new twist to this is that Cummins is in the process of purchasing Jacob's vehicles system that manufacture the current Jake brake!
The manufacturing rights were sold to the Jacob's Manufacturing Company, yes the drill chuck company. There was no new company formed
I heard that Jacobs is now split between different new owners, Danaher and Cummins.
Who the fuck is classie?
@@benjaminturpin2749 Clessie Cummins, original founder of the Cummins diesel engine company. One of the biggest researchers into the early development of the diesel engine.
This is the best explanation of jakes I’ve seen so far. Big fat thumbs up 👍🏼
Since we’re going down the diesel rabbit hole here, you gotta do “run aways”…
That would be interesting. Years ago I went over Donner pass and grapevine almost every night and I saw many trucks in the run off ramp. Always felt bad for those drivers. I'm sure some of them had to change they're drawers after they got stopped
@@alanbrown2666 I think he means the conditions where a mechanical fuel pump keeps adding fuel to an engine that won't shut off
@@zenjon7892
Oh. I probably would have known that if I would have paid more attention to the video. Thank you
~2:20 I used to work on fighter jets. We had a mneumonic to remember the 4 stages of jet engine operation, which are pretty analagous to 4-stroke engine operation.
"Suck, Squeeze, Bang, Blow" - Intake, compression, combustion, exhaust. This was taught in the official training.
Interesting!
That was a pretty good explanation.
Years ago I worked for a major motor coach manufacturer. There were 3 basic types of auxiliary brakes offered. Jacobs brakes, transmission retarders (Allison), and magnetic driveline brakes.
When a Diesel engine is under no fuel, the engine works to compress the air in the cylinder. If no fuel is added, that compressed air will push back down on the piston making for neutral braking. On a Jake brake with no fuel yes the engine works to compress the air in the cylinder, but the exhaust valve opens near top to expell the compressed air hence their is no air pressure left in the cylinder to push the piston back down again-and you get all the compression strokes working as a brake-usually around 400hp of braking.
400Hp of engine braking only at High RPM with all cylinders actively providing braking effort. Also not all engine brakes pop the exhaust valve open near the top of the compression stroke some will actively partially open the valve at the start of the compression stroke and will remain partially open through nearly the entire compression stroke. The piston has to work against the restriction of the valve and sometimes also and exhaust brake downstream of the turbo. This is done to cut down on noise
@@j.m.5995 The original Jake brakes were activated by the injector-hence they opened the exhaust valve near top dead center and at the highest compression pressure-which made for a noisy Jake Brake. Now most Diesels have a separate lobe on the camshaft to operate the Jake brake making them both more effective and quieter.
@@Tchristman100 Was this on overhead Cam engines? I can see how the injector lobe on a pump injector setup could be rigged up to Piggly back off the mechanism to pop open the exhaust valve as it essentially fires fuel at the same time you would want to activate the exhaust valve. I don't know how they could do this on a injector pump setup but I guess where there's a will there's a way lol cheers to Jacobs and their Engineering whose work has spare many a countless life through out the span of time
@@j.m.5995 On engines with an injection pump (like my Caterpillar 3406B mechanical) the Jake brakes work off cross activation. For instance number 1 cylinder is on compression but number three is on exhaust. So number one gets Jake Brake activation by the exhaust valve activating the Jake brake from cylinder 3 to work one. It works OK-just not very strong.
I love the sound that old trucks make while engine braking. active sound design can probably replicate it but at a tolerable noise volume for newer trucks
I’ve always heard that sound but never knew what it was. Always thought it was a rad sound so thanks for explaining it!!
absolutely love the sound of jakes
Love that sound, I lived next to a highway hill section. It would shake the house, awesome. It would give me enough time to see a decked out rig go buy.
Love that Jake brake sound!
can't understand why any one would object to the sound of a jake brake. to me it is like the laughter of children. I actually feel a boost of energy when i hear a jake brake. i guess energy is never lost, acording to issac newton.
Used to drive OTR, loved the sound of the Jake Brake especially going down
MT. POCCONO ON MY MAIDEN voyage !
There's a story on the net about how Clesey Cummins (yes, that Cummins) came to invent the jake brake. He was in California in the 1930's with a truck going down hill and narrowly missed a train when he couldn't stop. Cummins invented the jake, but his own company refused to buy it, so he sold it to Jacobs. Clesey Cummins only worked for Cummins, he didn't own it.
The story i heard from a person that was a personal friend of clesey & tested the engine for clesey . The story is the bankers that financed the engine co would not back the engine brake , because they thought it would comprise the engine & ruin the engine & its reputation . So there you go bankers screwing things up AGAIN!!
Thank you... big time. From time to time I've tried to find out how a Jake brake works and only found idiot phrases like 'changes the airflow thru the engine to provide braking', as if the audience had no idea what goes on inside an engine.
Your explanation was superb.
Very well explained, Thank you.
Most excellent explanation.
I love that sound
I love the Jake brake sound!
Who doesn’t love a Jake brake and who starts looking all around when you hear one to see what kinda old school beautiful rig that’s Jake Breaking lol I do
Oh the sweet sound of the jake brake send chills through me
Gotta love the sound of the Jake!!!
2:15 combustion in an ICE is not an explosion, it is called deflagration which is a controlled flamefront.
Which just sounds like a fancy way of saying Explosion, Megumin would be proud :D
Yep, it's not an explosion, it's a controlled burn. It just happens rather quickly.
I used to live near a highway when I was a kid... I miss this sound so much.
Great explanation.
You are extremely well spoken. 👍
love the sound of loud Jakes!
Thanks for the video!
A Diesel engine provides much more engine braking than a spark ignition engine. Compression of the air with 18:1 Compression ratio generates plenty of heat. All that heat energy results in the vehicle slowing down.
Hell yeah, just try crank starting one of those old farm diesels.
electrical retarders are more effective though. the best is to have both obviously
Thank you ahaha when I heard that I was like wtf ahaha diesels are great for the fact that they engine brake, the Jake’s are just an even better brake so you don’t have to use your service brakes and fade them out on a hill
No diesel has a butterfly in the intake unless you have a jake or some kind of engine retarder they will run right past the governor even in low gear going down a steep hill
Nonsense. I've been driving trucks for 35 years and can tell you that loaded or empty, if you lift off the power there's no noticeable drag at all. Remember that compression pushes the piston back down with the same force.
Current engine brakes involve the turbo creating back pressure. They are not only quieter, they are a lot more effective than the old Jakes. I can take a max weight truck down the Grapevine and only occasionally touch the brakes.
If you want to continue this Diesel engine series you could talk more about cylinder head stuff like timing and valve overlap, glow plugs etc
You can always tell a rookie trucker, they are always the one that leaves the Jake brake on while driving through Cities, towns and Metro areas 🤪
Or he's just a menace to society 😎
Thank you
Well done
Best sound ever
I use my jakes all the time big brake saver honestly best thing ever
i love that sweet sound 👌
Had a Jake brake fail on a mountain pass in Colorado. My boss was driving. We were 80,000 lbs. To keep from runaway he kept it low gears and was pumping the brakes. Motor stressed and blew close to the bottom. I imagined what sitting on a bomb would be like. I bounced off the headliner. Speed was OK at this point, let it let run out on the flat & got it pulled over, oil trail behind us.
No cell phones back then. Hitched a ride to a phone & called the agent we rented the tractor from. He wanted to know if we were prepared to pay for the blown motor. I ask him if they would've been prepared to pay for our funerals. They towed another tractor to us & dragged the casualty away. We didn't hear about paying for that motor again.
There are a lot of truck drivers who use the jake brake as a weapon against people who live on lakes, they go really fast and then jake brake for about an 8th of a mile while going by our lake, just to make as much noise as possible. The difference between cowboy's boots and a truck drivers' boots, $hit on a cowboy's boots is on the outside.
Ngl I had no idea what Jake breaks were I just loved hearing this sound growing up in the woods living off the road. But WOW this happens every second maybe more??? Engines are beautiful
I live in an apartment that's 20 feet from a downhill road where trucks drive and there's nothing worse than being woken up constantly at all hours of the night to this sound. Waking up in a panic not even being able to hear myself think
I love the sound of the Jake Brake.
In most diesel commercial car (at least as old as 2002 I would say) there is a throttle valve at the intake for the EGR. This throttle is also used for engine breaking
A throttle at the intake can't generate net braking. It just determines the fraction of incoming air that is fresh vs EGR. Either way, the intake will get a given quantity of air and no braking will result.
However, you CAN produce braking by throttling the exhaust and this is often used to "push" EGR up to the intake manifold. Today, you'll often see a VG turbine used for that same effect, although the throttle is more versatile and less limited.
I always wondered how that worked. Thanks!
Ditto
I never knew diesels have minimal engine breaking. Always assumed the high compression provided high braking, too. Glad I checked this out.
Compression is only half the story-- the piston expands too, so the net braking effect is very weak.
Nothin stopping airflow. Now what if there was a intake shut off? Honestly idk but with diesel compression idk if it would do harm or not.
Very educational
Some of the city buses here in the 90s had jake brakes i think, but heavily silenced. There were a sound from them that were very similar to jake brake. There are also other solutions, like retarder brakes that acts on the axel to the wheels
Usually buses and european trucks use hydraulic retarders.
im not much of a diesel guy but theres something satisfying about hearing jake brakes. like car guys hearing turbo backfires
A lot of towns have ordinances outlawing engine braking.
I only ran my Jakes when I needed them, but you see drivers bobtailing or between gears when upshifting with the jakes on!!
I had a functional Jake Brake installed on my 2 stroke dirt bike. I used the bike for enduros, which is like rally where one can encounter weird and wild terrain.
The best and most laugh inducing way to describe a four stroke engine cycle is SSBB or Suck, Squeeze, Bang, Blow.
Never fails get a snigger out of at least one person in the room.😁
When I was a kid we did a lot of camping up in Siskiyou County, Mount Shasta, Lake Siskiyou, McCloud River, take a ride out to Burney Falls just beautiful country. One of my fondest memories is sitting around the campfire in the late afternoon telling jokes/stories/lies and hearing the logging trucks rolling down off the mountain Jake Brakes blasting,
Jake brake and the air horns are the only reason I drove Big rig in the 1990's
Pretty awesome! I got to work as an applications engineer in their plant in Connecticut!
Back in the JB Hunt, and a few other companies, didn't have Jakes on their engines. We would see them in the litter box, with their brakes smoking, nearly every day. For some reason they thought all of us log truck drivers in the Cascades, were insane. They could be right but, gravity is free, and brake shoes cost money.
I love the sound lol
I have a exhaust brake on my 2500 Cummins and a 5in unrestricted pipe and when I'm coming home you hear it sounds like a big rig love that sounds... and when I go to the city the sound bouncing off the buildings is great
Do that here in Oregon and you’d be subject to a $2000 fine.
@@SodaAnt7 that's vwhy I don't live in a comie state
Actually small diesels have plenty of engine braking by expending energy compressing extremely lean mixture (newer engines can cut off fuel injection completely). And since petrol engine throttle body cuts air intake, in comparison diesels have even better braking. Checked many times in practice.
Cheers from the Pacific West Coast of Canada
Good vid.
Is it necessary to use them in truck stops or entering them ,especially the trucks with straight through stacks.
Great graphics
Hello!! I have a peterbilt 335 with the paccar x6 engine with engine brake, my question is my transmission sometimes fails and the scanner showed low voltage but we couldn't find the problem, whenever the transmission fails the jake brake doesn't work either. Have you had any experience like that?
Funny, I have never heard of a "jake brake"..🤔 In Sweden we use exhaust brakes, that just shuts down the exhaust flow from the engine and let the engine just compress it's own exhaust over and over again. Very effective brakes and it's controlled by a big valve driven by a aircylinder on the exhaust pipe, and when you touch the brake pedal it activates or you can activate it with a button, but it shuts down below 1100rpm..
I love it.🤩
Hearing a peterbilt jake braking on the freeway going downhill hill sounds awesome
Ok, great explanation. Now, how is the exhaust valve timing changed?
I love Jake brakes
They also have transmission braking and quite a bit of that to boot. Like the sign says at the top of all big steep hills that tells trucks to use low gear. There's plenty of trucks that don't have jake brakes.
Question. Are you losing fuel in that compression cycle? Since the compression is released at the top of the compression stroke is the sound of the compression braking caused because the ignition detonation is released directly into the exhaust system? Thanks
Can you do an explanation of the mack version of braking,because it dont work half as well?
I'm not thin skinned. I love the sound of diesel engine and a jake brake.
I'm sure they might come in handy in extreme situations, but drivers around here - a sparsely populated rural area - just LOVE to use them as they go by. No reason - we're on a gentle slope, not a hill, no turns... just being annoying because they can.
Many years ago the exhaust connector just after the header pipe came off resulting in a very loud C16 cat engine, when I used the Jake brake OMG it was crazy loud. That was the greatest day of my 30 yrs driving a truck, driving past kids walking home from school and using the Jake as I passed them set them in a instant panic dropping the books and running in terror from the unbelievable sound. I remember taking the engine all the way to redline and braking as I drove through the short tunnel in my town creating the most awesome terrifying insanity loud Jake exhaust sound Imaginable. Was awesome!!! Good times.
That sound can be deafening when you are outside right next to it- like those kids were. Always wondered what retards did for fun. Now I know...
I can't agree that diesels don't have any engine braking without an exhaust brake. I use engine braking all the time in my manual transmission 5.9 cummins. The engine braking come from all of that diesel compression ratio. It's not like having an exhaust brake but trust me, its there and I have used it to slow down trailers for years now.
Agreed but people complaining
about Jake's but there important
I like the sound 😂
Thanks for the explanation. I always thought it was something special, like a special horn, that the truck driver uses to be obnoxious.
I would absolutely love to hear the Jake brakes in town lol
i just learn jake brake
thanks you very much
from singapore lah
We motor home drivers are mostly amateurs about our machines, and we frequently are towing a car behind our coach. Fifth wheel style RV trailers have another different set of problems. It would be interesting to see an overview of the various brake systems employed by RV. My RV, for example, is a 40 foot coach, towing a Chevy SUV, with an added braking system for the towed car, brand name Air Force One. It works great, but don't ask me to explain how it works! And the coach has an electric switch to engage "engine braking," same story.