ws6 Posted August 10, 2008 Report Posted August 10, 2008 i just installed a pd coolhead with 21cc domes,FMF gnarly pipes and silencers, i did a compression test with a mac tools compression tester and both sides tested between 160,165 psi is this within normal range? what octane fuel should i use and what mix ratio? i'm running a 2 into 1 setup with a keihin 34mm PE carb with a 185 main 52 pilot and a cgl needle on 3rd clip from bottom @ 480ft ASL is this a good start for my setup? thanks in advance i wouldn't have got this far without this site and all you guy's help Quote
LiftdT4R Posted August 10, 2008 Report Posted August 10, 2008 Wow, that seems really high, for only 21 cc domes. Are you sure they are only 21cc? Can't help you with the octane. Quote
ws6 Posted August 10, 2008 Author Report Posted August 10, 2008 my bad i just did another test i was reading it wrong it's at 155psi both sides Quote
LS1Inferno Posted August 10, 2008 Report Posted August 10, 2008 I don't exactly remember but i think that is safe for 91 octane. And your compression doesn't have a lot to do with the jetting its still the same amount of fuel and air coming in,its just being squeezed harder Quote
xXBlessedWithDeathXx Posted August 10, 2008 Report Posted August 10, 2008 I had kinda the same set up but will bills pipes and 19cc domes then went to CPI. my main was a 165 4th clip not sure about the pilot tho. i would also use 93 octane but yea you wont be to lean if thats what your shooting for. i`m not sure about your elevation but i would say you will be fine and i`m sure you will have to lean down some on that main. Quote
xXBlessedWithDeathXx Posted August 11, 2008 Report Posted August 11, 2008 ratios are a touchy subject but i ran 32:1 belray for the first few months and went to Amsoil 44:1 i`m also no expert but the last two posts is how i ran the shee. Quote
_Hex* Posted August 11, 2008 Report Posted August 11, 2008 just run 50/50 race gas and pump, i had the exact same setup you have before but i always ran full race gas no need tho, definately 50/50 on 32:1 Quote
RollinRhino Posted August 11, 2008 Report Posted August 11, 2008 just run 50/50 race gas and pump, i had the exact same setup you have before but i always ran full race gas no need tho, definately 50/50 on 32:1 Sunoco race fuel mixed at 28:1 is what a guy who worked for Evinrude told me is the best setup for a racing type engine. The higher oil mix keeps the rings seated properly. Problem with race fuel though is that it costs some money to buy so I use Shell 93 as a substitute. Quote
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