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Old 16-09-2009, 03:52 PM   #58
Cosmo Dude
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Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
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Quote:
Originally Posted by 70NYD View Post
oh tru kewl, i just learned something, i didnt know cams can be too agressive for turbo
I'm sure others will have an opinion but here goes mine...
An NA engine can use the inertia/flow of the exhaust gas leaving the engine to create a vacuum effect. If the inlet valve opens just before the exhaust valve closes then you can use tht inertia/flow to drag more mix into the engine and create more power, this is called overlap. In a turbo charged engine this can cause some of the air/fuel mix to blow through the engine and be wasted so you send expensive petrol out of the exhaust (also called polution) and get no power benefit.
There is much more to the story but you're going to have to find it yourself.
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Last edited by Cosmo Dude; 16-09-2009 at 03:54 PM.
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