CadillacBanshee Posted December 3, 2005 Report Posted December 3, 2005 My friend just checked his compression and it is 189psi with coolheads. Whats the best octane to run? With yamauibe belray synthetic. Quote
FASTOYS Posted December 3, 2005 Report Posted December 3, 2005 I would say with almost 190 lbs of compression he will need at least some 110 octane! Or alky ! Quote
420 RACING Posted December 3, 2005 Report Posted December 3, 2005 I have 180psi on mine and have about 25-30 hours with no problems running during the summer and winter. I use turbo blue 110 leaded mixed 32/1 with klotz supertechnaplate. just my .02 good luck Quote
CadillacBanshee Posted December 3, 2005 Author Report Posted December 3, 2005 checked again, its 185. Is there a disadvantage to having compressoin that high? Quote
Shee-Male Posted December 3, 2005 Report Posted December 3, 2005 checked again, its 185. Is there a disadvantage to having compressoin that high? 444349[/snapback] pinging...and putting sunroofs in both your pistons Quote
blueshee03 Posted December 3, 2005 Report Posted December 3, 2005 yeh it takes away from topend,but higher compression does give more bottom end.165-175 is a great compression range. Quote
hittintrees srh Posted December 3, 2005 Report Posted December 3, 2005 checked again, its 185. Is there a disadvantage to having compressoin that high? 444349[/snapback] What domes are you using? Quote
CadillacBanshee Posted December 4, 2005 Author Report Posted December 4, 2005 my bad, 20cc domes Quote
hittintrees srh Posted December 4, 2005 Report Posted December 4, 2005 my bad, 20cc domes 444638[/snapback] damn that a lot of compression!!! Ive got 19cc. domes and im around 130psi. Though I do have a good size port, I still think it might be time for a new top end. Quote
rocketboy Posted December 4, 2005 Report Posted December 4, 2005 octane requirements are not just reliant on compression or dome size alone ,the exhaust port height , the ignition timing ,and squishband clearance all come into play . 100ll aviation fuel would be my recomendation for you,id say bout anything over 105 will work ,youl lknow if its detonating ,plugs will have tiny aluminum specks on them and youll hear the bike popping/pinging and hesitating Quote
lonestar Posted December 5, 2005 Report Posted December 5, 2005 (edited) checked again, its 185. Edited December 5, 2005 by lonestar Quote
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