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Originally Posted by dozer
Again, a turbo-turbine is NOT just a windmill....NOT just a simple propeller...it IS a HEAT ENGINE.
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I'm sorry but the above is flat-out incorrect. If that were true then a turbo would not be able to make any boost if run immediately after a cold start. The simple fact I can make 5+psi with my VNT by revving the engine right after starting disproves your heat engine idea.
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verify for yourself that what I'm saying here is true.
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I'm sorry but it isn't. They
are simple fans.
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It's also a partial factor in why adding an intercooler tends to reduce the boost a few psi at the same engine conditions as before.
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It reduces boost a few PSI because the air is more dense for the same amount of airflow as well as less boost is needed. Measure before and after an intercooler and you can see the drop.
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The same factor is why it's an advantage to wrap the headers....i.e., to maintain the gases as hot as possible going into the turbine.
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No, its to maintain the gasses velocity. As the gasses cool they slow down, wrapping headers keeps heat in to keep the exhaust from slowing inside the pipes and causing restriction.
I'm sorry, but you study up a little bit more on the fundamentals of how these things work.
07-29-2008, 06:03 PM
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