[DeTomaso] 351C (ignition) timing

JDeRyke at aol.com JDeRyke at aol.com
Sun Apr 12 15:25:41 EDT 2009


IMHO you're on the right track: for best acceleration, try to get the 
centrifugal advance all-in by 3000, with not more than 36 degrees total: initial 
plus centrifugal plus vacuum (if used). The exact amount will vary with the 
engine setup. Total initial advance is easily varied by moving the 
distributor body but be very sure the primary mark on your harmonic balancer hasn't 
shifted so its still true TDC. The springs only vary the rate of advance, not 
the amount, but total centrifugal advance is usually variable by means of a 
pin that sticks thu the fixed plate in the distributor and has a sleeve 
that can be varied in thickness. Total vacuum advance is often variable by 
sticking a small allen wrench thru the hose connection pipe and adjusting a 
bleed hole. Vacuum advance sometimes can 
increase mileage at cruise but seldom WOT power. Finally, be aware that 
electronic timing lights vary (especially the dial-back types), so amounts of 
all three advances that work fine on your engine-with your light, may not 
work exactly the same for someone else. And I added to your post-title, 'cause 
timing the camshaft is a whole 'nother subject which can affect best 
ignition timing, too. Good luck- J Deryke 


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