Don't understand cams

That's not true.

I have 2 engines, same cubic inch, same compression, same heads. One has a 104LSA and the other a 112. The other specs (lift and duration @.050) are all the same. One idles like a top fuel dragster, the other like a puppy.

The ability of it to start properly and be throttle responsive, yes, tuning has a very large part to do with that.

An email from Jim Laroy...

"The wider lobe separation angle closes the intake valve later and reduces cylinder pressure, so that is where it's detonation resistance comes from. Really wide lobe separation angles are used in boosted applications. Many later model engines use wide lobe separation angles to reduce overlap for idle quality and fuel economy.

The only reason I use a wider lobe separation angle is to smooth out the idle and increase idle vacuum. "


Yellow rose and I disagree on this, starkly. You'll have to decide for yourself. But look at some Thumpr cams from comp and check out the LSA's.