I may not have the credentials to really weigh in on this one, but since it's a Message Board, why not..., so here goes: I think there is a situation where this could be true, that "an engine runs better right before it blows...." and that would be if a motor was a little fat (rich), but then for some reason (low fuel pressure, air leak effecting multiple cylinders, carb issue, the mixture became leaner... and leaner.... and leaner... and then even leaner still and eventually "too lean!", I do think there is a point somewhere between even leaner still and too lean!" where the engine would actually make more power for a little while (since it wouldn't be as rich as it was)... but because a lean mixture burns hotter than a fat mixture, the leaner you go, if you go too far... the more likely that you would burn a hole in a piston or do some other pretty expensive damage.... If the problem was low oil pressure, or overall engine overheating, then I think the engine would run worse on it's way to blowing up. One last point: does anyone remember how those COX Sand Dragon's or whatever they were called, how they would have a high pitch to the engine and right as they were running out of fuel, the rpms would rev up for about 10 seconds before it finally stalled. I'm thinking that was where it was going from a little rich (normal) to a little lean and that was the cause of the "running better" for a little while.
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