Originally Posted by BarelyAWake
edit: again no offense, but I've now searched for anything to substantiate xlite's findings and I can't seem to find anything - could ya maybe point me in the right direction? I'll never
get this past my technician friends elsewise
I was also skeptical that less oil runs cooler when I ran across that in more than one of the Yahoo ultralight and engine forums. Personal experiments showed it was true. I suggest trying the popular 16:1 mix and then 100:1 with IR thermometer handy.
Theory states that much of the cooling on these engines is not due to air flow but vaporization of gasoline. Oil does not contribute hence the less the better temperature wise. Lubrication is a separate issue.
One of those rare cases where theory lines up with practical results.