Quote:
Originally Posted by dmjlambert
The detonation (or ping or knock) on my truck sounded very much like a rattle from under the hood. I could hear it while accelerating on a test drive. So I retarded by timing by a couple of degrees and took it for a test drive again. I repeated retarding the timing until the pinging was gone. I ended up at 7 BTDC and my vacuum advance gives 23 degrees of advance. I had a separate thread here on the forum about those numbers and using the timing light.
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Just imagine how it would run with 14 initial and 15 from vacuum. Way more power and likely better mpg’s too.
You can easily limit the vac advance with a limiter shown in here. You could even make your own.
http://www.crankshaftcoalition.com/w...EI_distributor
Sorry for the sorta highjack!
That link might help the op in the long run!