k&b 7.5 ob compression ratio for 65% nitro

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k&b 7.5 ob compression ratio for 65% nitro

Postby chris henderson » Sun Oct 14, 2007 8:14 am

I have a water cooled K&B outboard 7.5cc that I want to run on 65% nitro. How do I determine the correct compression ratio for this engine / fuel combo? Do I adjust shims untill I get the correct psi with a compression gauge, or is there a specific known head clearance I need to set? Can somebody please help? Thanks, Chris
chris henderson
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Joined: Sun Oct 14, 2007 8:03 am
Location: cleveland, ohio

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