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Turbocharging and Blow-Off Valve Explained

13:14
54:08
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At 13:14 in

The Indianapolis Motor Speedway Museum: INSIDE The "Off Limits" Restoration Shop! (Indy 500 Winners)

What happens here

The speaker then explains the functionality of a blow-off valve, mandated by CART (Championship Auto Racing Teams) to regulate turbo boost pressure. He details how teams would attempt to manipulate these valves to gain an advantage in qualifying, aiming to get as close as possible to the pressure limit without triggering the valve and losing boost. This section ends by showcasing a 1968 Johnny Lightning Special with a visible turbocharger, emphasizing the evolution of turbo technology.

Goal: Learn about turbocharging technology and the purpose of mandated blow-off valves in racing.

Tools and materials

  • Blow-Off Valve N/A — Regulating turbo boost pressure
  • Turbocharger N/A — Forced induction system on the engine

What they say

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they ordered that what they call the wastegate be placed on top of the manifold . And this was a sanctioning body at that time, it was called CART, championship teams for automobile racing. So they all had a regulated flush valve . So if I overcame a certain pressure, I would jump. Of course, teams tried to manipulate them, especially in qualifying, but the key was that you wanted to get as close as possible because if that thing came loose, you lost all the boost pressure. And then you had to wind it up again. So the teams were trying to do this dance of getting as close as possible without triggering the alarm . Once it fired, did it come back down or did it get stuck and you were screwed? He went back down. It works with springs, so it's actually mechanical. Then it closed again, but when I released it, I'm sure it lost a little more pressure than the maximum . I think Tim's family, I think his father invented a machine to make tunnels under roads to lay pipes and things like that. I believe that's where Tim Richmond's career was funded . Well, they say that to make a small fortune in racing, you have to start with a big one. So. Yes. Do any of these cars race? In this exhibition, I mean, almost everyone can run. Lately we have focused on winning cars. The Lotus can race. I think the VPJ can work. But these will be further down our list. Our top priority was to get as many Indy 500-winning cars racing as possible. You can pause and read this. If they have any liquid, you'll see it on the floor. That's how things are. But we pickle all engines, especially, you know, the ones that run on alcohol. So we have to wash all that off because it can cause a lot of corrosion if it's on the block. And we used the Sneva car this year. Ah, yes, here's one of the Foyt engines. You can see that it says Foyt on the cam cover. Oh. I just saw the FO. I imagined he was saying Ford. I hadn't even realized I had n't seen it before. Mhm. Good point. It's the same as Ford's. You see the FO and you accept it.

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