yanPR22 Posted December 4, 2018 Report Share Posted December 4, 2018 I recently got this Trinity head from kawa110 and was wondering if I can run 20cc domes on pump gas or should I go with 21cc? Right now I’m running 66mm pistons with no port, vforce4, Tomey T6, 28mm PWKs and pods Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Ayesully810 Posted December 4, 2018 Report Share Posted December 4, 2018 (edited) Your going to want 22 23 cc domes mcdermott racing will take care of you pretty sure they have to make the domes for that style head since its trinity Edited December 4, 2018 by Ayesully810 1 Quote Link to comment Share on other sites More sharing options...
97Screamer Posted December 4, 2018 Report Share Posted December 4, 2018 You need to do a compression check to answer that. 20cc will be close to the limit but every motor is different. I'd also run stock timing with that small of domes on 91. 1 Quote Link to comment Share on other sites More sharing options...
ZillaFreak Posted December 4, 2018 Report Share Posted December 4, 2018 First what is your pump gas? 91, 93, 94? 15% blend, no ethanol? Static compression is just one part of the formula for required octane. 20cc is too high for a non ported engine. Quote Link to comment Share on other sites More sharing options...
Schweet97Z Posted December 4, 2018 Report Share Posted December 4, 2018 Also elevation of where you ride. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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