CadillacBanshee Posted December 3, 2005 Report Share 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 Link to comment Share on other sites More sharing options...
FASTOYS Posted December 3, 2005 Report Share Posted December 3, 2005 I would say with almost 190 lbs of compression he will need at least some 110 octane! Or alky ! Quote Link to comment Share on other sites More sharing options...
420 RACING Posted December 3, 2005 Report Share 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 Link to comment Share on other sites More sharing options...
CadillacBanshee Posted December 3, 2005 Author Report Share Posted December 3, 2005 checked again, its 185. Is there a disadvantage to having compressoin that high? Quote Link to comment Share on other sites More sharing options...
Shee-Male Posted December 3, 2005 Report Share 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 Link to comment Share on other sites More sharing options...
blueshee03 Posted December 3, 2005 Report Share 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 Link to comment Share on other sites More sharing options...
hittintrees srh Posted December 3, 2005 Report Share 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 Link to comment Share on other sites More sharing options...
CadillacBanshee Posted December 4, 2005 Author Report Share Posted December 4, 2005 19CC domes. Quote Link to comment Share on other sites More sharing options...
CadillacBanshee Posted December 4, 2005 Author Report Share Posted December 4, 2005 my bad, 20cc domes Quote Link to comment Share on other sites More sharing options...
hittintrees srh Posted December 4, 2005 Report Share 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 Link to comment Share on other sites More sharing options...
rocketboy Posted December 4, 2005 Report Share 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 Link to comment Share on other sites More sharing options...
lonestar Posted December 5, 2005 Report Share Posted December 5, 2005 (edited) checked again, its 185. Edited December 5, 2005 by lonestar Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.