101Diesel Posted January 18, 2013 Report Share Posted January 18, 2013 421 Cub drag ported, 20cc domes with 170 psi and squish at .055, Shearer sb in-frame, 39 pwk's on alky. I would like to pick up some more low to mid but don't want to run the risk of burning a strap or a hole in the piston. I dune the bike hard and then drag at banshee hill. Currently my timing is at +5, can I add more timing if I keep the power jets fat? Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted January 18, 2013 Report Share Posted January 18, 2013 Your half way to where it should be. Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted January 18, 2013 Report Share Posted January 18, 2013 You can def run more timing Imo Quote Link to comment Share on other sites More sharing options...
Turbo Chassis Posted January 18, 2013 Report Share Posted January 18, 2013 agree with n2o....your almost half way there in my opinion...almost Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted January 18, 2013 Report Share Posted January 18, 2013 shit I think most of the alky guys on here are running up near 10* of timing if not a little more Quote Link to comment Share on other sites More sharing options...
101Diesel Posted January 18, 2013 Author Report Share Posted January 18, 2013 Cool Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted January 18, 2013 Report Share Posted January 18, 2013 Bump it up a few at a time and check your tune each time you change. Quote Link to comment Share on other sites More sharing options...
101Diesel Posted January 18, 2013 Author Report Share Posted January 18, 2013 What tune do I want to avoid hearing? Quote Link to comment Share on other sites More sharing options...
101Diesel Posted January 18, 2013 Author Report Share Posted January 18, 2013 What tune do I want to avoid hearing? Quote Link to comment Share on other sites More sharing options...
camatv Posted January 18, 2013 Report Share Posted January 18, 2013 KAPOWW!!!!! thats the tune you want to avoid hearing.. alky with that much squish clearance you can peg a +12 plate no problem if the squish band is really wide you may have to back it off some Quote Link to comment Share on other sites More sharing options...
101Diesel Posted January 18, 2013 Author Report Share Posted January 18, 2013 Great, I don't want it pinging or sounding like marbles in a can because of detonation. I run for a lot longer distances then 300'. Builder recommends not going past 6 because of dunning it. He did set the squish wide and compression lower for that reason. So you guys are saying its not going to get to hot at +10? I read that every 4* of timing is about 2hp, and people prefer to advance timing over using a smaller dome. Is this in correct? Quote Link to comment Share on other sites More sharing options...
Paulie B Posted January 18, 2013 Report Share Posted January 18, 2013 Hellz I run +10 on race gas. Quote Link to comment Share on other sites More sharing options...
101Diesel Posted January 18, 2013 Author Report Share Posted January 18, 2013 Hellz I run +10 on race gas. What size domes and squish? Quote Link to comment Share on other sites More sharing options...
Maklerd Posted January 19, 2013 Report Share Posted January 19, 2013 ^ look up! Quote Link to comment Share on other sites More sharing options...
Paulie B Posted January 19, 2013 Report Share Posted January 19, 2013 What size domes and squish? Stock 22cc dome, milled to 155 psi. 110 octane race gas Quote Link to comment Share on other sites More sharing options...
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