Originally Posted by z-adamson
The distributor can easily be locked out and the ignition system has the ability to retard timing by 20* during cranking.
How do I decide it I want to use a timing curve or just lock the timing out?
Under what conditions is lock out timing most desirable?
I would imagine that certain combos work better with lock out timing than others, I am not clear on which combos that would be though.
Big cams and race engine's are best suited to locked in timing advance a manual transmission makes living with this arrangement a lot easier. Cams getting into the range of 300 degrees of duration and over a half inch of lift are getting into this category.
Electronic systems have the ability to both control advance and retard eliminating the need for vacuum or mechanical advance within the distributor. These are great choice as the engine can be very closely tuned for RPMs and loading.