akelly000 Posted December 28, 2011 Report Share Posted December 28, 2011 What determing factors come into play when deciding on the octane of fuel I need to run? It seems to be soley based on compression. True?? Quote Link to comment Share on other sites More sharing options...
gh2010ism Posted December 28, 2011 Report Share Posted December 28, 2011 What determing factors come into play when deciding on the octane of fuel I need to run? It seems to be soley based on compression. True?? Yes compression is the reason you do not want the charge to detonate to early so you use higher octane gas because it burns slower.. I believe 150 is pretty much the limit on pump gas but I could be wrong. Mine has 135 and I run 21cc domes. Hope this helps.. Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted December 28, 2011 Report Share Posted December 28, 2011 Higher octane fuel, while it does burn slower, is actually needed to run higher compression motor because it is more stable. It helps stop detonation because it is actually harder to ignite with compression and heat......but it does burn at a slower rate. I believe that the pump fuel is usually good (depending on your setup) for up to about 155-160 psi......however there have been cases where people on here have been able to get away with pump fuel on JUST a little bit more compession... Quote Link to comment Share on other sites More sharing options...
2004LEBanshee Posted December 28, 2011 Report Share Posted December 28, 2011 Timing and dome shape also play a factor. Quote Link to comment Share on other sites More sharing options...
guns4children Posted December 28, 2011 Report Share Posted December 28, 2011 im running 24cc domes and im at 160psi. i rode it a trip and dont see any deto with 93 pump gas. but some guys would say im still over the limit. Quote Link to comment Share on other sites More sharing options...
Coupelx Posted December 28, 2011 Report Share Posted December 28, 2011 All of you need to read this. The only thing slow burning in this thread is your brains. http://en.wikipedia....i/Octane_rating im running 24cc domes and im at 160psi. i rode it a trip and dont see any deto with 93 pump gas. but some guys would say im still over the limit. exactly. there is so much more than cranking psi that determines what to run. mine is around 150 on 91 and i beat it like it owes me money. Quote Link to comment Share on other sites More sharing options...
coryv4 Posted December 28, 2011 Report Share Posted December 28, 2011 (edited) Yes compression is the reason you do not want the charge to detonate to early so you use higher octane gas because it burns slower.. I believe 150 is pretty much the limit on pump gas but I could be wrong. Mine has 135 and I run 21cc domes. Hope this helps.. i might be mistaken but isnt it bad when gas "Detonates" or what some idiots call pre det? isnt gas suposed to ignite not detonate? Edited December 28, 2011 by coryv4 Quote Link to comment Share on other sites More sharing options...
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