yes rich is the condition that would allow that and at the same time crud up the combustion chamber and possibly wash the lubrication off the cylander walls. Greatly decreasing the life of your engine. I have heard of it being done. I have never personally seen it except in a movie.

Could be done with a small tank of propane with no damage if a nozzle was put into the exhaust before the end maybe.

I learned all I need to know about life by killing smart people and eating their brains.
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