RCU Forums - st40

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SchoolRoomSpads

03-11-2003 03:32 PM

st40

What % nitro should I run this engine on. It is my first ringed engine and I'm wondering if it requires different fuels than my abc's. I run my other engines on coolpower 15% nitro. I live in new mexico, elev 5000' (if that matters). Thanks!
Tommy

ramcharger

03-11-2003 04:50 PM

st40

We run 4*40 races and the only engine allowed is a ST 40 with a stock muffler and 10x6 MAS prop and all run 15% Cool Power. You should get between 14,000 and 15,000 rpm. If engine is new run 2 tanks (6 oz/tank) sloopy rich then let her rip. Keep fuel tank outlet on same level as carb inlet for best performance.

SchoolRoomSpads

03-11-2003 05:51 PM

st40

Thanks ramcharger. Will stay with the 15%

bignasdy-RCU

03-11-2003 05:56 PM

st40

imo: switch too omega. My St s dont like cool power.
d

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