Quote:
Originally Posted by Frank Miller
I went to a chevy conversion on my stock 49. Have not had a chance to really try it out. I am running the vacuum advance as well. As I understand it it will retard the timing a few degrees when stepping on the accelerator to prevent pinging allowing a little more advance at cruising speeds. Similar to how your wipers stop working when you stomp on it. What I do end up with is a little more advance at idle.
Bubba, What is the total advance of the chevy distributor and how much is centrifugal and how much is vacuum?
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Centrifugal is 16 to 24 degrees and vacuum is 14 degrees on a stock setup. May vary a little.
The issue is that the vac and centrifugal overlap each other as you couldn't have full vacuum at wot or full centrifugal at idle. So combined they would provide a constant 15-24 degrees all the time after the engine was started.