[quote]
Originally posted by: TheNadine
your not suppose to run low grade gas in the raptor engine man, 91 octane or higher

yes but higher octane burns faster so it would increase engine temp if you run higher octane with regular gas it burn crappier and slower there for the engine wouldnt be so hot

 

higher octane generally burns cooler because it burns in a more exact fashion, also the only reason you'd need 91 or higher octane is if your compression is above 12:1

 

thats not true at all!!!


with 11-1/2:1 compression you half to run it! and on the 400ex the dealership tells you to run it in it!!! and im sure for the raptor its the same!!

THE dealership dont tell you these things just to hear themselves talk!!!!


yes jetting should fix your problem!

hope you get it worked out

 

at 12:1 compression you half to run Race gas with 11-1/2:1 compression you have the option and with 13:1 compression you half to run race gas also!!!

thats just what advanced machining and powroll said to me when i sent them my engine!

 

sorry about that....i was meaning 11.5:1...that's what i have in my mojave and they sent a little chart that shows when detonation occurs and you can still run 91-93 with 11.5 and then you can run race anything above that with 12:1 or higher...didn't mean to ruffle you up...but if your putting premium in somthing that's not detonatating or running high compression there is no benifet...you're just spending money