2strokespirit Posted August 8, 2008 Report Share Posted August 8, 2008 HI there I am about 1000m (3280ft) above sea level. Running 20cc domes I am right at 154 compression. Will it be safe to run 4 degrees timing advance without detonating? I figured I should maybe go down to 21cc domes if I advance the timing? I am running 93 octane gas. I never had any problems with detonation with the 20cc domes ever, just worried if I advance the timing to 4 degrees it might start detonating especially on longer straights when going WOT while its pulling hard in the last few gears.. Thanks Quote Link to comment Share on other sites More sharing options...
KlotzBanshee Posted August 8, 2008 Report Share Posted August 8, 2008 You should be fine advanceing the timming. If it does detonate, increase your octane level. Quote Link to comment Share on other sites More sharing options...
mdhc500 Posted August 8, 2008 Report Share Posted August 8, 2008 (edited) wow... you are getting 150+ psi compression at over 3000' with those size domes??? Are you testing on a cold engine? ANd yes you should be good at +4, just be sure you are running some higher octane fuel at anything over 150 psi... Edited August 8, 2008 by mdhc500 Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted August 8, 2008 Report Share Posted August 8, 2008 You should be fine. I ran 150 PSI at +4 on 89-90 octane fuel. Mx ported engine. Quote Link to comment Share on other sites More sharing options...
2strokespirit Posted August 8, 2008 Author Report Share Posted August 8, 2008 Yes, if you check out the Noss site you will see they actually say 156. The thing is I do not want to run anything higher than 93, it is to much of a hassle to get the higher octane fuels here... Quote Link to comment Share on other sites More sharing options...
mdhc500 Posted August 8, 2008 Report Share Posted August 8, 2008 Yes, if you check out the Noss site you will see they actually say 156. The thing is I do not want to run anything higher than 93, it is to much of a hassle to get the higher octane fuels here... The 156 is for 1000' not meters, and I misread... I thought you said 22cc domes... I was wondering! lol :biggrin: Sea Level 1000' 2000' 3000' 4000' 5000' 18cc 197 178 171 170 165 145 19cc 183 167 160 158 152 137 20cc 169 156 149 146 140 129 21cc 156 145 138 134 128 121 stock 130 125 118 112 106 100 Quote Link to comment Share on other sites More sharing options...
2strokespirit Posted August 8, 2008 Author Report Share Posted August 8, 2008 Ahh thats why I am so confused, we work in meters, not ft over here... makes a lot more sense now... Thanks guys.. Quote Link to comment Share on other sites More sharing options...
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