ignition advance curves

[Clive Apps Techno-Logicals 416 510 0020]

> 
> Any time peak cylinder pressure occurs before top dead center, some
> perfomance is lost.  Whether detontation occurs or not.  The only way to
> tune the spark advance to be on the razor's edge is to put a pressure
> transducer in the cylinder and monitor the pressure in relation to crank
> rotation.  Flames anyone?

exactly
usaully want peak prussure to occur around 5-10% ATDC to produce max power

Clive