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Message: <blockquote data-quote="synchron" data-source="post: 700121" data-attributes="member: 115">A centrifugal pulley works liike its step up gearbox too? to make a single rotation from an outside force seem like a thousand (just exaggerating, dont mind it)?I think you should read the pass thread, I have shown calculation on it. A turbocharger turbine is propelled by exhaust stream, and a centrifugal is turned by the crankshaft and its step up gearbox.A centrifugal also needs to spin fast to pump efficiently. However, without step up, a turbocharger can be pumped nicely.So we can deduce that exhaust stream rotates the impellor faster than directly driven from the crankshaft?As you can see turbo has lag in low RPM, with the step- up gear centrifugal s/c can reduce the lag time.But how come centrifugals must spin fast to pump efficiently, and roots dont have to?I was told it is the design. How does the design affect it??Centrifugal and Roots are different all together even they are belt driven. I have posted the different in my last posting. At the begining the Roots chargers can pump in more air, but all the air is not compressed in the charger itself but in manifold. Until high RPM the roots tense to loose it grip because they just run out efficientcy because the Roots charger will generate alot of heat.Centrifugal are different because they need to compress the air in the compressor housing. At high RPM the air inside the compressor housing will have a very high pressure. It is pretty to understand, you will need to read alot. I cant really explain much myself.</blockquote>

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