Variable valve springs are common.

For the life of me, I have yet to understand why they don't use this in large diesel engines for road trucks.

"Bear" ? Not "bare"? (Sorry, but ....grammar.) Thanks, fun interesting video. Cheers from the Pacific West Coast of Canada.

That is a jet btw. All you need to make a jet is a length of heated pipe, fuel, and air. Well, we call it a jet, but if Im not mistaken, it's classed as a rocket.

Thanks Renault.

After seeing Drivetribes heavily dissapointing video on the Mazda Furai, it's sweet seeing someone who actually cares about cars enough to go as far as to debunk myths, thank you so much!

I remember the first time I climb into a Mini as a kid. I said, it's like a TARDIS. I was amazed.

Cool

And they sound crap. F1 sold it's soul and threw away the greatest soundtrack in sport. Very sad. 🙁

Smart, thanks for the good infos .

this "rocket" is more like combustion chamber in turbojets

History lesson ends and explanation starts at 5:40

We need to develop rotary valves for IN and EX, those will require only a fraction of the torque needed to operate

Is there an other kinds of gases that have been tried???

Big rock hammers like that go on big trackhoes...450 or bigger...that rock hammer has a nitrogen filled bag that can develop 80,000 pounds in to the bit that hits the rock...that bit Takes three men just to roll it around....

Valve float....chey bad about it at higher rpm spring just can't bounce back fast enough.... cause loss of valve control which leads to rpm loss or whores

Modern f1 engines dont rev over 13k rpm. Bmw first winners turbo charged championship. Rotax 2 strokes rev 25k. Try to be coherent plz. Ty🎉

Pressurized coolant. Very interesting. I like how one guy makes a turbo into a jet engine with remote ignition chamber and puts it on a gokart, while rally teams do the same thing but attach it to an air pump and drivetrain.

Great video, and an enjoyable watch, although I think you've compressed Volvo's entire BTCC engine programme into just the 850 estate years. That wedge-shaped head didn't see its ultimate evolution, and 300bhp+ output until the 1998 season and it was in the S40 by that time. I think you're probably citing the same document I read though, with Charlie Bamber in Race Car Engineering. It's interesting that the original cylinder head design was settled upon because it meant opposing valves could be machined at the same time, and not for any good performance reason. Again, an excellent video.

F1 is dying

The f1 engine is designed to rev that high. Same as motorcycles designed to rev higher than car engines. The reason is that torque is not needed for f1 engines, i.e. racing up a hill or up a very high mountain pass plus being very lightweight racing cars property all F1 cars nowadays are under 1 ton (2000 lbs). Most FIA F1 tracks have very little elevation changes. Spa has the most elevation changes 102.2 m. However, there is no clue if the slopes are a gradual rise or a sudden/fast rise. Maybe someone has information and can share slope ratio information for Spa.

Why not a Desmodromic setup ?

so its a pulse jet?

Rocket = polsjetengen

Why not pipe engine exhaust pressure thru check valve to fill valve chamber?

Why don’t the factory make the stiffer sway-bars? What is the negative side of the harder sway-bar?

My favourite is v8 Supercars

Why no mention of desmo?

I think I know what film I'll be watching later on this bank holiday Sunday...

Those 1.6 liter V6s only turn about 6500 to maybe 7000 rpm. Watch any formula 1 race where they show the engine rpm and throttle application as well as what gear the cars are in. The V-10s that used to be the engines are the ones that turned around 18,000 rpm. But they didn't have the turbo chargers nor the battery assist that the modern F1 cars do. The pneumatic valve trains have been in use for decades.

Great video. Picked up a GR86 Trueno. Love what today is doing with the line up. Also have a 2007 FJ Cruiser TRDSE with over 300k miles and going strong.

Amazing history, narration and explanation! These wonderful videos deserves our like, comment and gratitude. 100/100

This Kiwi's favourite Roger the Dodger story. He went to McLaren in the UK in 1967 and talked Bruce into selling him a CanAm McLaren. An M6B I think. McLaren was not selling customer cars at this time. So old Rodger probably emptied his pockets! LOL He took it back to the States and spent another two fortune's on it. Americanizing it. That is, chroming everything, painting and pinstriping everything. In the first race in 1968, he showed up with his baby and parked it next to Denny's car. Bruce's and his boys efforts over the winter. Their completely new version, M8A, hurriedly given a splash of papaya orange paint. And easily 20-seconds a lap faster than the Penske and Donahue's Sunoco trailer queen.

Sorry, but you hit one of my sensitive points. A spring fatigue failure is not like bending a paperclip until it breaks. A paperclip breaks because you are plastically deforming the metal (stressing it past its yield point) and this causes work hardening, embrittling it. Fatigue failures are cyclic failures of a material that has been stressed below its yield point (you haven't plastically deformed it), but causes accumulated damage. These are two separate failure mechanisms.

I have ADHD and I really enjoy technical videos

Is that a precision fabritcated inconel rocket tube in your pocket or are you just happy to see me? 😏

This was so cool!!!🎉 I love racing engines so much! Please cover some V12 race engines someday❤

3D printing rockets could open up some creative possibilities. Like the 3D Tesla valves in the new rotary combustion engines from NASA could be an interesting

Very informative!

When Penske's IndyCar program got busted for cheating recently you heard people saying "that's so unlike Roger Penske, he's above that". I was like "What Roger Penske do you know? Penske has been pushing the rules for decades now."

No coil bind & valve float

When Agassi still had hair

Renault did not invent pragmatic springs. It was used way earlier in low speed marine diesel engines.

the lower pressure at low lift, means the valve seats are not slammed and beaten to fail.

My dream car... 06'

Why not use the Ducati valve train?

Penske and Chevrolet weren't the only ones acid dipping, most of the rest of the competition did it too. Sam Posey tells of the time his team left the body in the acid bath a bit too long. No problem until an official who had been looking over the car leaned on the roof with his elbow and it just buckled. "Oh, what's this" he said, we can't have this! Team Posey got permission from Chrysler Corp. to go to a local dealer and cut the roof off a showroom car and put it on the race car to get through tech inspection. Trans Am, with its strong factory backing at that time, tried anything they thought they could get away with to improve their chances!

Nice insight on every major racing series. As a Bangladeshi 🇧🇩, motorsport culture isn't big here. It has very niche fandom (we have Avik Anwar who races in UAE 🇦🇪 organized races), perceived to be a rich man's sport because of it's barrier to entry involving a vehicle. From 20 years ago, I have casually watched almost all the racing series you mentioned here except the Mazda series maybe. Been watching Formula E since around 2015, awaiting this series to become the pinnacle because FE is great to watch from an Engineering perspective.

I would like to see a video with and without sway bars on a car

what is name of song at 3:09?