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The few lines of mine you didn't quote stated in no fewwer words that the turbo will not turn over most efficiently (In terms of generating boost) without either flow or heat. I never said heat would turn the wheel by itself. I said that it would make the greatest contribution to making the turbo more efficient and responsive. You ask where in Maximum Boost this mentioned; here you go: Pages 117, 119, and 129, just to name a few.
You quoted someone else who paraphrased a passage from Corky Bell, trying to correct them for saying that exhaust heat is a portion of raw energy dumped out the lait pipe; I ask you: how much energy it takes to exhail? None is the answer, you relax to let the gas out. The engine does not work to allow gas to escape, the exhaust system operates off of residual rotational motion from the crank, and reciprocating motion of the rods/pistons. Heat energy is much easier to lose than maintain, as well, so the fact that exhaust exiting the tail pipe is still warm means that there is more energy left over that the turbo could possibly have made better use of. He (Corky) also states boldly that heat energy works to eliminate a large portion of the lag a turbocharger encounters while spooling to create viable boost pressures. Without the heat (As I tried to explain with my bench test), you would suffer from horendous lag. Again, you tried to use the torch for a testing tool; not smart. Let's just stop with the pyromania. That whole energy cannot be created nor destroyed thing; that's actually a quote about matter. Matter can neither be created nor destroyed. Energy has no mass, so you don't really create it; you generate it, expend it, transfer it, store it, lose it, or gain it. It can be conducted, inducted, insulated, shared, so on and so forth.
Yes, the compressor side gets very hot to the touch because even without using hot exhaust gases to drive the comp wheel, compressing air generates a great deal of heat. The less efficient the compressor wheel, or the more pressure you ask it to generate, the hotter it will get. 400 degrees is possible from a T04E wheel generating 30 psi. My T04E 50 trim can make 248 degrees at 18 psi. You think that might burn your hand? That is from an electrical shaft drive for flow testing, too, not because of the turbine side. The bearing housing has oil and water running through it on many turbos, do you think the oil would withstand coking if the turbine side could heat the compressor side to that temperature? Not likely. Try sticking your hand on the valve cover after a long drive, and then blame it on the exhaust gases in your crank case when you burn your hand.
I could start using equations to explain my points further, but you'd probably try to use a torch to solve them. The point is, unless you can pay someone to agree with you, anyone with half an engineer's whit would likely not. Thanks, though.
John
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Wood/Anderson Racing Development: j.anderson@wardev.com
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