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i have this 2 cylinder 72mm bore 61mm stroke engine.motor have 7:1 stock compression with maximum operating rpm on 4500 to 5500 running on gas.i was going to run it on methanol with 5% nitro blend.any thought what is the maximum compression can i go with this convertion?best regard roy.
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It's been a long time since I've run any nitro and I don't know anything about compression ratios. It was in a 250cc (back then known as 15 c.i.) Konig. I had to run bigger jets and change ignition timing. And as I remember 20% nitro was about the minimum amount to get any increase over straight methanol. So 5% probably won't do much good. Regardless, I would buy a bunch of extra pistons to have on hand if I were you.
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ROY, About Methanol
Roy,
What kind of engine is it? What kind of pistons? What size and make of carburetor?
If you've got descent pistons, I'd go to 9.2/1 compression ratio to start. You'll want much bigger jets and probably a bigger carburetor. I've got all the carb's and main jets, if you need them.
Jim McKean
E-Mail: captainjimmckean@yahoo.comComment
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Nitro %? Very tricky. It's never good when you get it wrong.Attached FilesComment
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Nitro!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Back when we ran 2 cyl Konig's at Depue my owner/mechanic misread the percentage of methanol to nitro to castor oil... 20 percent NITRO...blew my engine borrowed Armond Herbert's B..blew his too !!!!! never used it again.
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