Quote:
Originally Posted by duxthe1
I've seen broken rings in these engines before. It happens something like this.... Grandma puts it around for years and years. The engine develops a bit or ridge at the top of the cylinder. Car gets passed on and being as they are slow molasas the next owner runs it quite a bit harder than Grandma did. Higher revs stretch the rods and slams the rings into the ridge worn into the block. Result is a hard starting engine that no amount of tinkering is ever going to fix.
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The greatest force on the rod is when the fuel ignites during the compression stroke, when the piston is forced downwards. Compressive forces makes things shorter while tensile forces makes things longer in general, if the parts are malleable enough for the forces involved. Please explain when the tensile forces are great enough to stretch the rods.