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Originally Posted by dood  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. |
Ho do you figure that you are getting close to 14:1? According to CP the stock setup only specs out at around 10.7 despite what honda claims. You can safely take off .020 on the stocker but that doesnt get there. The cp 13:1 piston puts the valves at .050 from the piston. How close are you running it? More displacement maybe?