ESE's works engine tuner

[F5 Dave]

That's real interesting and introspective empirical information, so thank you.
But why did you spell realised with a 'z'? I assume autocorrect.

[JdG]

Thanks a lot for the detailed information Wobbly!

Very interesting to know that one can vary quite a lot with the oil : fuel ratio without having to change the jetting.

Also like you said: no race engine should run 50:1, but there’s still heaps of people around that think that more oil reduces power (because of less fuel, if you don’t consider the oil to be a good fuel also) and who are scared that their engine will foul in no-time because of the additional oil.


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[lohring]

On our 26 cc race engines we found doubling the manufacturer's recommended ratio to 16:1 increased power significantly. Power still increases up to around 10:1 and the big end bearings live longer at 16 to 19,000 rpm. More oil doesn't seem to increase power further. We tested several different oils at the same ratio and there was no power difference. All this i believe comes from better sealing on our 36 mm, single ring pistons. I would expect this to make less difference on larger pistons. Below is our fuel test data.

Lohring Miller