ignition advance curves

[BUTLER, Tom]

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?

Tom Butler


> -----Original Message-----
> From:	Robert Humphris [SMTP:r.humphris at indigo-avs.com]
> Sent:	Tuesday, March 24, 1998 1:01 PM
> To:	'diy_efi at efi332.eng.ohio-state.edu'
> Subject:	RE: ignition advance curves
> 
> Out of intrest how can you prove this statement?
> 
> >The optimum advance is just before the "onset of pre-detonation" in
> the 
> 
> Rob Humphris