Postby Phil Clark » October 14th, 2017, 9:02 am
50:1 on BelRay & regular supermarket unleaded on all my Zenoah's........and I fly HARD in prolonged full throttle Warbird slots.....never had an issue.
40:1 on a new engine for the 1st gallon......drop to 50 after that.
More oil does not mean safe.......Zenoah's are industrial derived engines from chain saws and the like, in this environment, they are run far harder, in a harsher environment than a model aircraft & rarely if ever get cared for by their owners. High oil content will just gunk up your engine, give excess mess from the exhaust & reduce your power output. A failure of an engine such as this will be far likelier due to poor installation/lack of cooling that low oil content. Oil does not cool your engine.......air flow & fuel do that.
Phil