mesa banshee Posted August 31, 2007 Report Posted August 31, 2007 I Am in the process of purchasing a cool head(PT). I live in AZ with an elevation of about 1800ft. My engine is .40 over and mildly ported, Fatty pipes and K&N. Every one in a while i go to elevation of 7000 ft but not often. Which size domes do I buy. All help appreciated..... Quote
RIPRuck Posted August 31, 2007 Report Posted August 31, 2007 What octane gas do you run and whats your compression? Quote
mesa banshee Posted August 31, 2007 Author Report Posted August 31, 2007 What octane gas do you run and whats your compression? 145 lbs and 91 octane Quote
RIPRuck Posted August 31, 2007 Report Posted August 31, 2007 I would say 21cc domes but let others give input. Quote
letsgetthisdone Posted August 31, 2007 Report Posted August 31, 2007 did you mill your stock head, cuz your compression has already been raised to higher than stock.. what elevation do you most of your riding at, and are you willing to run racegas, 50/50, or do you wanna stay on strait pump fuel.. Quote
Snopczynski Posted August 31, 2007 Report Posted August 31, 2007 did you mill your stock head, cuz your compression has already been raised to higher than stock.. what elevation do you most of your riding at, and are you willing to run racegas, 50/50, or do you wanna stay on strait pump fuel.. Ditto. Quote
mesa banshee Posted August 31, 2007 Author Report Posted August 31, 2007 did you mill your stock head, cuz your compression has already been raised to higher than stock.. what elevation do you most of your riding at, and are you willing to run racegas, 50/50, or do you wanna stay on strait pump fuel.. Yes stock head is milled but not sure how much. Mostly at 2000 ft elevation and I would like to run still on pump fuel. thanks for the input Quote
letsgetthisdone Posted September 1, 2007 Report Posted September 1, 2007 (edited) 21cc will put you safely in the pump gas range. 20cc will prolly put you on the edge of runnin 50/50. I'd just get the 21's, and if your compression is still around 140, you can go down to 20's. most builders will just trade domes with you, so you don't need to worry about paying for a second set of domes.. EDIT: if you haven't already, buy an adjustable timing plate and set it ot +4 degrees.. Edited September 1, 2007 by letsgetthisdone Quote
mesa banshee Posted September 1, 2007 Author Report Posted September 1, 2007 21cc will put you safely in the pump gas range. 20cc will prolly put you on the edge of runnin 50/50. I'd just get the 21's, and if your compression is still around 140, you can go down to 20's. most builders will just trade domes with you, so you don't need to worry about paying for a second set of domes..EDIT: if you haven't already, buy an adjustable timing plate and set it ot +4 degrees.. thanks for the input, i will run the 21's Quote
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