Originally Posted by
Charley
Because gasoline is oily to begin with. Also the air:fuel ratios are different.
CR
You mean to tell me that gas is 8 times oilier than the actual lube?
The A/F ratios for methanol are almost 1/2 that if gasoline (twice as much fuel) so let's just use 2:1 for simplification.
For a given WOT run of similar duration (X) in similar glow fuel/gas engines.
10oz of glow fuel @ 20% lube = 2oz of lube for X.
5oz go 20:1 gas mix = .24oz of lube for X.
The glow fuel engine supplied 8 X as much lube during X. Add the fact that the glow fuel engine will be running dramatically cooler than the gas engine.
I suspect that there is more than just "lubrication" involved in the extremely high oil content of glow fuel. Perhaps the glow ignition has something to do with it?