a technical discussion, engine efficiency |
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a technical discussion, engine efficiency |
r_towle |
Aug 15 2005, 08:27 PM
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#1
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Custom Member Group: Members Posts: 24,598 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
so, I have been thinking (not always a good thing)
If an engine is basically an air pump, and the objective is to make it as close to 100 percent efficient, why is the exhaust valve so much smaller than the intake valve? Forget emmisions, forget fuel delivery, just want to understand why this is so...it is so on most engines... Rich |
Jake Raby |
Aug 15 2005, 09:38 PM
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#2
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
......... Because that about 20% of the air fuel mixture is burned completely and the density of a burned mixture is MUCH less than one thats atomized with fuel...
I have built some awesome Turbo engines with the same size exhaust valves as intake, with a really modified cam to promote it... BUT don't ask them to run very well N/A |
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