The act of greatest wear on our engines is when the crankpin is just a bit above mid-point and the fuel injected is for max power. This is where the sideways force is greatest piston to cyl wall.
It’s load that wears out engines.
Bad operating, poor maint, and neglect that “kills” engines. Very very few engines in pleasure trawlers get the chance to get worn out.
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Eric
North Western Washington State USA
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