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dood · 12-27-2007, 08:09 PM

I've built a couple 150R's with close to 14:1 CR and the fuel we ran was Ultimate 4 which is only 93 octane. It didn't ping and the only reason I ran that fuel is because I couldn't get a hold of any MR-9 which is only 89 octane. I normally run MR-9 in alot of my RoadRace engines which have nominal CR's in the hi 13's with no issues.

12-27-2007, 08:09 PM	#4 (permalink)
dood 3rd Gear Member Join Date: Sep 2006 Location: Washington Posts: 2,558	Re: 150R High Comp Piston I've built a couple 150R's with close to 14:1 CR and the fuel we ran was Ultimate 4 which is only 93 octane. It didn't ping and the only reason I ran that fuel is because I couldn't get a hold of any MR-9 which is only 89 octane. I normally run MR-9 in alot of my RoadRace engines which have nominal CR's in the hi 13's with no issues.