I see what your saying, the centrifugal force created by the crank would basically be allowed to throw the piston up higher due to the lack of bearing material on the bottom half of the rod. The piston going higher would then cause a higher compression. It makes sense that this could happen when the engine was actually running and that would acount for the slapping sound if/as the piston was hitting the bottom of the head due to the extra travel allowed by the loss of bearing material. The problem with the higher compression caused by that in this instance is that I checked compression by just turning it over with the starter. I guess anything is possible but I don't understand how the crank would have developed enough force to throw the piston like that at such a slow speed.
Taking that idea one step further, when I got the nozzels changed and the cylinders all firing like they should be there would have been more force on the top half of the rod from a better burning fuel/air mix. It's possible that the better, quicker burning charge would have allowed the downward motion of the piston to keep up with the cranks movement thereby reducing the severity of the knock just like I saw happen.
What really happened inside the engine I guess I'll never know. This particular machine also had other issues such as a worn out center pin, worn rear axel trunions, etc that the customer wanted me to eventually repair after it was running. Given that and the fact he has three others he can also use it's just not economically feasible to spend money getting the engine rebuilt on a machine with so many other costly problems. Ultimatly all I can do is chalk it up to a learning experience where $hit really did happen.
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