Mercedes Created The World’s Most Efficient Racing Engine

Mercedes Achieved A 50% Thermal Efficiency Engine
Awesome Car Products:
Subscribe for new videos every Wednesday! –

Mercedes has developed the world’s most efficient internal combustion engine used in automotive racing. With a test engine developed for Formula 1, Mercedes has exceeded thermal efficiency greater than 50%, a remarkable achievement for the automotive world.

This achievement is a result of many, many different technological strategies and improvements throughout the power unit. Two of the major strategies will be discussed in this video, which include the MGU-H, as well as pre-chamber ignition allowing for lean burning.

Engineering Explained is a participant in the Amazon Influencer Program.

Don’t forget to check out my other pages below!
Official Website:
Car Throttle:
EE Extra:



  1. Post By baliktad8

    MGU-K stores energy from braking, not the MGU-H. The MGU-H is used to keep the turbo spinning to prevent turbo lag.

  2. Post By DersNoNem

    For some reason I always have in thought that by learning to improve the car performance, it will help us to improve the economy of an engineDo a CVCC video after this!

  3. Post By Chrx x

    Such a basic concept, but a brilliant idea.

  4. Post By rallyrat

    Maybe all the fuel is injected into the pre chamber and then ejected into the cylinder upon ignition. That would cool the wall separating the pre and main chambers. Much of the fuel injected during the intake stroke might find its way into the main combustion chamber, while the air entering the pre chamber during the compression stroke might tend to keep fuel inside. That would allow the fuel ratio between the two chambers to be tuned: earlier injection for a greater proportion in the main chamber, later for greater proportion in the pre chamber.

  5. Post By Fir3Chi3f

    Love it EE! I did not even know I wanted to know this

  6. Post By Frenk Vortice

    i enjoyed this. im now angry at automotive industries, for not making good cars.

  7. Post By Keita Linden

    huehuehue. you said "shaft" ( ͡~ ͜ʖ ͡°)

  8. Post By Shawn Raymond

    injector points at an ​opening in pre-chamber when the valve is open, the rest is obvious

  9. Post By Patrick Co

    This guy is good he should make youtube videos

  10. Post By Mycel

    and here I was thinking that they just used very fast cars.

  11. Post By Death Seeker

    How much would it affect performance if the pre chamber was made bigger or smaller? Is there a fixed ratio of size of pre chamber to the cylinder for maximum efficiency? Thank you.

  12. Post By Anthony Quattro

    Please try and include a TL;DW that would be pretty cool

  13. Post By porkpig350

    a little like honda's CVCC…"compound vortex combustion chamber" of the 80's

  14. Post By DylanCanDream

    Wheres BMW? Oh yea still being fixed

  15. Post By rijste94

    What about the added mass of the shaft. I imagine it would hamper the spooling up of the turbo. Perhaps it isn't such a problem. Keep the speed up. Or make it lighter with a composite.

  16. Post By crazywright83

    So it works like the idi diesels form from the 30s to 90s but with gas

  17. Post By Daniel Jensen

    Will we see the pre-chamber thing in consumer vehicles boosting mpg any time soon? I assume the mhgu is not that different from a Hybrid.

  18. Post By zuccheromorte

    Couldn't you mechanically cause a higher vacuum level in the pre chamber to cause a richer air fuel mixture while still using a single fuel injector??

  19. Post By Colin W

    I think two other big reasons on why Mercedes are so dominant in F1 right now separating of the hot side from the cold side of the turbo with channeling passing air directly on said cold side(the compressor) and prioritizing getting the hot exhaust gases directly to the hot side(the turbine) with the shortest route possible and not worry about the timing of the exhaust pulses by means of unequal length header exhaust manifolds. I could be wrong but I think Renault and Ferrari F1 engines still have a nest of snakes type headers channeling their exhaust to their turbos.

  20. Post By stickloaf

    taking recent German cheating and lying into account im going to be the first person to call BS on this…the 50% number is just propaganda to keep the ICE alive longer…diesals are 30 perecent! im not buying 50 from a gasoline powered engine

  21. Post By George Fox

    Can you say 70's Honda CVCC? What's the difference except turbo, Jason? 'Splain dat!!

  22. Post By Colin W

    Jason, this Mercedes F1 engine scheme looks like an updated version of Honda's CVCC engine introduced here in the 1970's with the Civic with super rich prechamber supporting ignition of the main combustion chamber which is using a super lean A/F ratio hence great gas mileage. Can you speak on my observation???

  23. Post By Nicholas Contey Jr.

    If the cylinders burn a leaner fuel-air mixture (oxygen rich), is Mercedes changing the way this engine is cooled? I'm sure the materials chosen are already capable of transferring these harsher F1 environments (pressures & temperatures), but I'm curious to know the downside to this operation.

  24. Post By justin vistin

    These f1 engines are a marvel of enginnering but no so much a marvel of entertainment. Thanks jason.

  25. Post By Thefarmhelp

    Why is regular cars not using this tech? It would be good for the environment and the economy to use this…

  26. Post By Húni Sighvatsson

    I wonder how this rich fuel mixture will affect emissions? Will soot be formed in the pre-chamber?

  27. Post By RandomDude

    Sounds like Mazda SCCI

  28. Post By Sam Gray

    Not to make you reveal your sources, but I'm curious where this information is for the public? Is there an MB F1 release and I'm just lazy to look it up?

  29. Post By Nate Caraway

    This reminds me a bit of how Mercedes had their prechamber setup with some of their indirect injection diesels

  30. Post By Jonathan Smith

    I really enjoy the whiteboard videos man. If these videos were available back in 2003 when I started the university, I would have chosen to be an automotive engineer/mechanic. Keep up the good work!

  31. Post By Eugene Tuorto

    I wounder if Mercedes is using 1 fuel injector in F1, by feeding both the pre chamber and the port at the same time via a y pipe of some kind. makes you think or at least speculate.

  32. Post By ThEcRaZ3dGaM3R

    Just as efficient as a 2-stroke diesel…

  33. Post By SlickRickOne

    Kinda looks like a modern and refined version of Honda's CVCC.

  34. Post By Arthur Henrique Mendes Berté

    Awesome video!I just have one question…If they somehow put a stronger fuel injector (that pumps in more fuel, perhaps dumps the fuel on the intake time, because vaccum), the pre-chamber will get a very rich mixture, while the excessive gasoline will somehow pour into the main chamber, and make the mixture lean, while the pre-chamber is rich?That way you would not need two injectors, just one with some very large holes, or better fuel flow…

  35. Post By roguedogx

    I can't wait to see this on a production car. I'm guessing some version will make it on to the project 1.

  36. Post By 1320crusier

    The injector is a 'conventional' direct injection injector. What they do is spray through the TJI manifold then calculate a second injection event accounting for fuel that remained in the manifold and such. So the second event may not spray the entire added 3% due to fuel still within it. The 2014 C7 Corvette (which is direct injection) ECM has provisions for dual injection events and would likely be able to run this sort of system if the cylinder head could fit the manifold.

  37. Post By Milky Way

    Mannn you are kinda boring

  38. Post By Absolute Nonsense

    i wonder how does this chamber perform with burnred exhaust gasses when exhaust valves open ..

  39. Post By shinybaldy

    I know a lot of F1 traditionalist hate this era, but I love the improvements in performance being made despite no refueling and increasingly small displacement engines.

  40. Post By AGHIL nadaraj

    i think merceded wasted their money and time for a short term profit.tesla will lead the automobile industry. They should concentrate on electric car technology

  41. Post By the_L3G.

    Sponsored by Mercedes

  42. Post By Benjamin Engleman

    Wonder why you don't see this in road cars. Maybe not as reliable? I can imagine you have to use some pretty clean fuel to avoid carbon buildup plugging the ports from the pre chamber.

Comments are closed.