RE: Cam Advance

["Ken Keith" <Ken.Keith@SpecialDevices.com>]

ptimmerm@mashtun.JPL.NASA.GOV wrote:
> 
> Anyone play with cam advance on DOHC engines,
> e.g. More over-lap for example?

Someone mentioned that the factor affecting performance is the intake 
valve timing.

This would be supported by the fact that the BMW M3 Evolution cam gear 
only affects the intake timing.  It moves the powerband higher, and bump 
the max hp as well, IIRC.

I have heard and mentioned before, but can't remember where from, that too 
much overlap will result in sending modulations in the airflow back to the 
fuel distributer airflow meter (flap).  But then again, if you've got a 
DOHC engine, you prolly have a hotwire instead of an airflow meter, I 
think.

Ken