in answer to : > Message: 5 > Date: Tue, 23 Jan 2001 13:30:23 -0800 > From: "stephen lakios" <[EMAIL PROTECTED]> > Subject: Dick > >Air is not pushed into an engine by atmospheric pressure.Air is drawn in by vacuum,created by valve timing.An engine would starve if it relied on atmospheric pressure.As the combustion takes place creating high pressure in the cly, pushing the piston down, the exhaust valve starts to open before the piston reaches the bottom of its stroke. The hot gases rush out,creating a vacuum.Just before the exhaust valve closes, the intake valve starts to open, extending the vacuum into the intake manifold and or the air chamber.This is why timing is so critical,and more so with a racing camshaft.Stephen
stephen, is the following still valid ? p1v1 = p2v2 if so, atmospheric pressure will be greater than the pressure inside the cylinder during the intake cycle, and will 'push' the air in, trying to equalize pressures. that's why turbos make an engine more efficient. they push more air in. same thing happens with 'cold'. there is no such thing, just less heat. regards, dick. Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html To unsubscribe, send an email to: [EMAIL PROTECTED]
