The Engine That Was Banned From Racing😭 | Explained Ep.29

What engine should I do next?

I own a twincharged Volvo. Known as the B4204T27 engine, I believe it to be the only successful implementation of twincharging on a mass scale. Most people, when I tell them it's twincharged, think I mean twin turbo. You'd be surprised just how many people, even enthusiasts, have never heard of this technology. The car is awesome, and embodies just what you describe. You get the low end torque of the supercharger, with the high end supplemented by the turbo. You can physically feel the switch between the two at around 4,000 RPM. It truly gives you the best of both worlds, without turbo-destroying anti-lag. Plus, the induction sound when the intake resonators are removed is absolutely out of this world.

Even in sim-racing, driving Group B rally cars close to their limits is terrifying, I can't imagine actually driving one on those tracks with the spectators everywhere.

Rip to the lives lost in Group B rally. What a time for engineering crazy engines, but disappointing the safety aspects were definitely overlooked

"It's said there's no replacement for displacement, but in actuality there is. It's called boost." One of the best lines ever

I operate locomotives for a living. When I started out, I was talking with the mechanic about the turbo on these monster engines. He explained that the turbo is shaft driven by the engine until we reach Throttle 7 or 8 (full throttle) then the shaft disengages and the turbo spins off exhaust pressure. I made the comment, that's kind of like twin charged engines! He looked at me like I was nuts... I knew then, we were not the same kind of engine nerds.

I'm always floored with the quality of your videos. 337 SPEED is cruising into the highest echelon of automotive content.

Italian here. The car or the engine didn't get banned because of its crazy power, but because spectators kept dying because they would often place themselves on the outside of turns or even inside the road itself. You can find some group B rally videos where cars crash into dozens of spectators killing many. Whoever decided to close group B, focused on blaming the cars, but instead it was the spectators. Modern rally is faster than group B, but it's nowhere close to being canceled. They just have more strict rules on spectators. Side note: engine has never been tuned above 600-650HP for actual races, and most of the times it was set to 400-450

Another interesting thing about the Delta S4's engine was that the block and head were cast in one piece like a prewar Bugatti.

1:40 It wasn't the Lancia or its engine that got banned from rallying, it was the whole Group B class that was banned. The class was spiralling out of control with deaths of drivers and spectators the result of lax safety of the time and cars that were simply too fast for the conditions, tyre and suspension technology and indeed, the drivers who had to steer them.

For the sake of completion and information, the twincharge system for the Lancia S4 was developed by eng. Claudio Lombardi, who later went at Ferrari Racing due to Lancia's "WRC" quit in early 90s.

Some aircraft were actually twin charged in the later half of WWII. They used turbos mostly to raise their flight ceiling and less performance gradient. They started feeding superchargers with turbos as a means to start with sea level pressure before multiplying it for more power. This was also being done on MASSIVE diesel V12 engines before the computer age.

That's what Lancia really was. It's heartwrenching to see where they are now

your delivery on these videos with the graphics is next level....I love it

volvo has a twin charged engine in production right now, i believe its the T6 lineup of engines

The evolution of this engine is the triflux engine.2 turbos on a 4 banger,where the valves are located in an X pattern,In a way that every side has 4 intake and 4 exchaust valves,made by the engineer Claudio Lombardi,the very same man who designed the Aprilia RSV4 engine.I think you just found your next video.Nice quality by the way.

Group B and all its glorious cars deserve a video, reminding us that some of the cars and car technology we have today was obtained through blood, sweat, tears, loss, and cheating. Love your videos, keep it up man.

Glad to see someone giving this engine so recognition. It’s crazy how many enthusiasts don’t know about this systems existence, and just how revolutionary it was, and still is in some ways

Volkswagen had a twincharged 1.4 engine a few years ago, a Polo GTI had 180HP. They had great power delivery but against a normal 2.0 Turbo they didnt get great fuel milage and suffered from lots of design faults which made them unreliable and unbuyable today...

Man your videos are really really good. Explaining how stuff works while telling a story about how it was employed. Very interesting stuff man. Keep it up.