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post #6 of Old 09-22-2009, 12:13 PM
SkyDork
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He's not trying to do the "block off" mod to prevent the decel popping. Tenn is attempting to gain some Hp by creating a vacuum in the crankcase which in "theory" will allow the pistons to decend quicker on the power and intake strokes and therefore increase power.

I've heard the theory before and I think it's BS. The problem is that when 1 piston is coming down, another is going up. So really the air displaced in 1 cylinder as the piston comes down is actually pushed into the cylinder with the piston going up. If you create a reduced pressure in the case then it's going to hold back the ascending pistons so any gains you might see in Hp by "sucking down" the decending pistons is gone. This is all based on the fact that you could actually create enough vacuum in the case to make a difference.

I'd like to see some hard numbers on this to back up the statement that "the engine is more efficient with the pressure drop"

I may not be perfect, but at least I don't ride a Suzuki.

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