"Sweet Spot"

[Eric Aos]

> If you set up a series of tests such that the only thing that 
> varied was the
> spark advance,  and you moved it such that the pressure peak 
> varied from 10 to
> 20 degrees atdc

Just imagine for a moment though if you could change that to 73 degrees
(for a 350 Chevy 3.48 stroke, and 5.7 rod) this is where leverage is
maximum (90 deg between rod, and crank throw). For a 228% increase in
leverage...