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The bit that causes melted pistons is that lean mixtures extend the combustion duration due to the slow flame speed,
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I don't buy that... it is my experience that
lean mixes should burn faster and hotter...run too lean you detonate which hammers the hell out of your engines internals....run to rich your changing plugs but the engine's fine....it's really no different from cranking the oxygen too high on an acetylene torch eventually you reach the point where you get machinegun like reports or one big bang that's the leanest of lean super hot super quick.....course at the other end is the sooty pure acetylene flame which burns fairly cool but very sluggishly...even the sound of this flame lighting is very sluggish and sounds a lot like a bubble in mud.
