Thread: Timing Issue? I wish I could get this thing to stop pinging!

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Originally Posted by Mikej

Mostly I have found that you need to retard the timing. Total mechanical timing. Which if I read yours correctly you are at 24 ( int and mechanical adv.) I'm running about 28. Ideal seems to be 34 to 38 to make power. I run the carb alittle rich. Lower engine temp. Not all good for making power. The other guys on here can explain what the Dynamic Compression Ratio is. But it is what you are after to keep the motor from pinging on lower quality fuels. By the way I'm running 11:1 BBC with iron heads on 91 octane fuel. Pinging is a problem from one tank of gas to the next.

Yea, retarding the timing should be my motto these days... Right now I am running around 24* of timing w/o vac adv. I am going to switch weights and springs in my dizzy and blueprint it to get the most out mech adv I can - until a few days ago I ONLY drove it w mech adv and it ran OK, until I changed the plugs... I have a std dist with a pertronix module I could swap back to to test but wanted HEI - always the trouble maker me

In regards to IDEAL timing, 36 seems to be the number to reach, but a total timing of 52* is not out of the question according to Lars Grimsrud, if I read his papers correctly... I would like to get more mech adv and reply on vac less if that is possible - not sure that is even good, just seems so to me

I found a good article on DCR here, time to dig up that cam card

11:1 is really high IMO but not too unusual, I just didn't want the kind of performance/problems associated with high compression engines - as far as the consistency of pump gas goes, that is the one variable we will NEVER have control of so a-tuning-we-will-go all year long

I honestly hope I can run 87 all year long but it looks like not, perhaps 89 in the winter and 91 in the summer cause as we know once the air heats up here in So Cal I get to do this all over again