Quote:
Grunterhunter wrote:
Quote:
A14force wrote:
I disagree that an s/c14 is too big. The bigger the blower the better.
I was right about your setup though? 1:1 and 8 psi?
if you assume 100% engine volumetric efficiency you should be seeing 13.5 psi (even more if you adopt the 80% vol. efficiency that is usually used for 2 valve engines)
so if that's right, the blower is only about 60% efficient give or take??
Sort of. There are a few variables that aren't taken into account though.
One, would be that my blower has unknown K's on it. As the wear, the efficency drops.
Another variable, would be that my boost gauge is a peice of chinese sh1t. It once sufered a nasty backfire, and took to reading 2 inches of vaccuum at rest. (So I pulled it apart and screwed the needle back around)
Perhaps the most important variable that has been overlooked, is the question of "what IS boost"?
Boost is only a measure of FLOW RESISTANCE/RESTRICTION between the pump, and the head of the valve. The local cylinder head guru told me that they id a blown V* race boat motor. It made 7psi. They swapped the heads for some real kick ass ones, and the boost fell to 5psi. Boost only accrues when the charge is slowed down and allowed to build up in the intake tract. The easier the flow can enter the cylinder, the less boost will there be.
Doesthat make sence?
I'm not saying that my engine is free flowing, but the bigger intake ports on my gx head probably flow better than the standard a15 head my old motor had.