Camshafts, idle quality, driveability and LSA-REAL WORLD EXP and OPINION

yellow rose said

They say in the text that the intake closing is what is affecting idle.

Didn't I say that? Damn, I need to print that thing off and look it over very close.

Just like I have said, the correct LSA will NOT affect the idle as much of the rest of the parameters are correct. It's all about intake closing.

And just like I've said, guys are pissing away a bunch of horsepower and torque right where we all want it.....MID RANGE.

Click to expand...

So we can ignore the overlap period altogether? Idle vacuum is all about how long (duration) and how high (lift) BOTH the intake and exhaust valves are open. This is viewed on a cam graph as the overlap triangle. The overlap triangles area (how large or small it winds up) is a by product of the LSA and what determines idle characteristics of that cam to a very large degree--even more so than duration, IME. J.Rob