Tommygunn Posted January 21, 2015 Report Share Posted January 21, 2015 Trying to figure out if I'm doing the right thing here. I have 66mm pistons, 19cc domes, cool head, drag ported cylinders, etc. etc. My compression checks out to be 195lbs in each cylinder. My timing has been set to +5 degrees but I'm told to move it to between +7 and +10 degrees. I'm running straight 100 race fuel because it's easy to get, I can buy it right at the pump 2 miles from home. Is this enough? Or should I be running 110? Elevation is 500ft Thanks Quote Link to comment Share on other sites More sharing options...
91coupemike Posted January 21, 2015 Report Share Posted January 21, 2015 I would think you would be on the edge with that much timing. But I don't know squat! Quote Link to comment Share on other sites More sharing options...
Tommygunn Posted January 21, 2015 Author Report Share Posted January 21, 2015 So I guess I should either leave it at +5 be looking for some 110? Quote Link to comment Share on other sites More sharing options...
nastyracing Posted January 21, 2015 Report Share Posted January 21, 2015 4 degree of timing max on that. your and the bitter edge of the fuel. if you wanna add that much timing switch to 110 oct min. in my opinion with that much compression advancing the timing that far is actually gonna fight the top end. 1 Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted January 22, 2015 Report Share Posted January 22, 2015 I've heard mixed ways of doing things. I'd talk to your builder. I call my builder before any drastic change like that. He knows more then I do what my motor does and doesn't like. Quote Link to comment Share on other sites More sharing options...
Nightmare Posted January 22, 2015 Report Share Posted January 22, 2015 I'd run the 110. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 22, 2015 Report Share Posted January 22, 2015 4 degree of timing max on that. your and the bitter edge of the fuel. if you wanna add that much timing switch to 110 oct min. in my opinion with that much compression advancing the timing that far is actually gonna fight the top end.Yahtzee^ Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted January 22, 2015 Report Share Posted January 22, 2015 Yahtzee^ X3^^ Quote Link to comment Share on other sites More sharing options...
Tommygunn Posted January 22, 2015 Author Report Share Posted January 22, 2015 Thanks. I believe I will leave it at 5 degrees and run 110 to be safe Quote Link to comment Share on other sites More sharing options...
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