400ex piston/ compression ratio HELP!
#1
400ex piston HELP!
I recently bought a CT racing built 440ex engie and it has a 13.5:1 copression ratio which requires race gas, i ride alot and cannot afford race gas, now my question is....what i the best piston/compression ratio for me? i dont want to run race gas, just premium with octane booster and i ride alot so i dont want to take all he reliability out of my engine or have to upgrade the rod.
#2
#3
400ex piston/ compression ratio HELP!
i would not recommend running octane booster. i would just buy a 10.8:1 ross or je piston and maybe even lower than that if your running a 440 with the extra heat made. with much higher than that, you will want race fuel, not octane boost, heavy duty studs, stronger rod, etc. many of the octane boosts are more harmful than helpful. most have chemicals that are rough on valve seals. many others barely raise the octane of the fuel even though they say they do. you might get away with the 11:1 compression with pump gas but it might detonate at higher temps.
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