Banshee 79 Posted April 21, 2006 Report Share Posted April 21, 2006 Hey guys I just advanced my timing to +4, my compression is at 158 p.s.i., do you guys think I can get by with 93 octane without having detonation. Thanks!!!! Quote Link to comment Share on other sites More sharing options...
Animalman294 Posted April 21, 2006 Report Share Posted April 21, 2006 I would run higher octane. Once you get to 160-165 you have to fun race fuel and since you advanced the timing also you should be running race fuel. You may get away with 100LL, but you will need to check your plugs and pay attention to the motor. The 100LL may even be too low, but I think that someone else will chime in if this is wrong. If you step up to race fuel it is usually 110 octane, and with your increased pressure you are going to need the higher octane and your engine will run cooler too. Anyway good luck man......... Quote Link to comment Share on other sites More sharing options...
watkins Posted April 21, 2006 Report Share Posted April 21, 2006 With 21cc domes and +4 Timing I blew a set up pistons due to detonation. You may get away with it, you may not. I'd rather error on the safe side and mix race gas with pump gas. Quote Link to comment Share on other sites More sharing options...
nutcase Posted April 21, 2006 Report Share Posted April 21, 2006 I'm running 93 octane with the following mods. Ported and polished prolite pistons reed spacers power reeds 18cc domes procircuit pipes I had a adjustable timing plate on but when i started mine after the rebuild its so freakin sick that i didnt need to advance it.Throttle response from a idle to wide open is an instant crack of the whip without any hessitation Quote Link to comment Share on other sites More sharing options...
Animalman294 Posted April 21, 2006 Report Share Posted April 21, 2006 Nutcase what is your compression, because if it is as high as I think it is, you are playing with fire . You are on the crazy side if this is what you are doing with 93 octane. Good Luck guys Quote Link to comment Share on other sites More sharing options...
Banshee 79 Posted April 21, 2006 Author Report Share Posted April 21, 2006 Thanks for the replies, I figured I would be cutting it close Quote Link to comment Share on other sites More sharing options...
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