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Location:
Brisbane
Registered:
May 2002
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Re: Another Idea (exhaust pump)
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Sun, 23 June 2002 12:50
 
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I think you'd reach a certain point where a vacuum in the exhaust would do more harm than good, ie suck unburnt fuel/air out of the combustion chamber if your cams have a bit of overlap.
As has been mentioned, a well designed exhaust system can use pressure waves to create a vacuum in the exhaust ports (this is the idea behind "extractors"), so there isn't much more to be gained by pulling the exhaust out of the engine.
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