quote:Originally posted by jackcarter1971:
All in by 5000 rpm? I have heard and read so many different points of view on this. Most seem to suggest all in by 3000. Some a little lower than that, depending on engine spec and vehicle weight ... That said, I would love to get some thoughts and experience on this subject ...
Jack
There is a curve that many engine builders, distributor repair shops, etc like to use. The centrifugal curve starts advancing between 1000 and 1200 engine rpm and reaches 24 degrees full advance between 3000 and 3200 rpm. A static advance of 8 to 16 degrees is then dialed in depending upon the needs of the motor for a total advance of 32 to 40 degrees.
The curve Ford recommended for the 351C in 1970 was based upon springs included in a dual point distributor conversion kit. It started advancing between 800 and 1000 engine rpm and reached 20 degrees full advance at 2800 rpm. The kit recommended 16 degrees static advance for a total advance of 36 degrees. The maximum advance recommended by Ford was 38 to 40 degrees, and they recommended retarding the static advance setting if detonation occurs. Detonation can put holes in pistons, bend connecting rods and spin rod bearings.