gofast5 Posted June 23, 2010 Report Share Posted June 23, 2010 I should be getting some big bore cylinders all ported by trinity soon theyre a stock cylinder with big bore sleeves. Im in the pittsburgh area sorry don't know elevation but would like to stay on pump gas. I was thinking like 21cc domes? Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
gofast5 Posted June 24, 2010 Author Report Share Posted June 24, 2010 elevation wis supposed to be about 300-400 ft where were locateed if that helps. Quote Link to comment Share on other sites More sharing options...
shakar Posted June 24, 2010 Report Share Posted June 24, 2010 (edited) elevation wis supposed to be about 300-400 ft where were locateed if that helps. http://www.nossmachine.com/banshee_heads.htm scroll all the way down to the elevation chart . i believe ive heard that you want to stay under 160 for pumpgas.i run 20 cc domes at selevel on a ported motor and end up with around 150psi .hope this helps good luck now that i think of it not sure if bigbore would be diff??askaround?? Edited June 24, 2010 by shakar Quote Link to comment Share on other sites More sharing options...
AKheathen Posted June 25, 2010 Report Share Posted June 25, 2010 actually, big bore makes a big difference. probably 21-22cc, but i would check with trinity first, to see what they say for their porting. Quote Link to comment Share on other sites More sharing options...
gofast5 Posted June 27, 2010 Author Report Share Posted June 27, 2010 Ok thanks bud I think im going with 21 or 22 just to be safe. Quote Link to comment Share on other sites More sharing options...
firebanshee Posted June 27, 2010 Report Share Posted June 27, 2010 Ok thanks bud I think im going with 21 or 22 just to be safe. How big of bore are you going to run?68mil bore with a 4mil crank at sea level with a 21cc dome will pump around 180psi. Quote Link to comment Share on other sites More sharing options...
gofast5 Posted June 28, 2010 Author Report Share Posted June 28, 2010 How big of bore are you going to run?68mil bore with a 4mil crank at sea level with a 21cc dome will pump around 180psi. The cylinders are 69.5 If I remember correctly and it will be on a stock stroke long hot crank. The bike has dyno port big volumes and t5s have to test both, pwk 28s with pods soon to switch over to a cfm box, +4 or +5 timing havent decided which to use yet, trinity stage IV porting and thats about it. It has boyesen dual stages and ill probably port the stock cages and mabey the cases if I get a chance. Thats about all I can think of hope that helps. Quote Link to comment Share on other sites More sharing options...
firebanshee Posted June 28, 2010 Report Share Posted June 28, 2010 The cylinders are 69.5 If I remember correctly and it will be on a stock stroke long hot crank. The bike has dyno port big volumes and t5s have to test both, pwk 28s with pods soon to switch over to a cfm box, +4 or +5 timing havent decided which to use yet, trinity stage IV porting and thats about it. It has boyesen dual stages and ill probably port the stock cages and mabey the cases if I get a chance. Thats about all I can think of hope that helps. To stay on pump gas with that bore you might need 23cc or 24cc domes. Quote Link to comment Share on other sites More sharing options...
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