Posted by Rootsy on September 17, 2008 at 09:22:18 from (24.176.37.149):
In Reply to: M vibration posted by ckfarmall on September 16, 2008 at 15:37:49:
C-248 engine originally came equipped with cast iron pistons. Generally when replaced the new ones were Aluminum. If the engine is balanced for a heavier cast iron piston / rod assy then by going to an aluminum piston / rod assy will cause the rotating assembly to be out of balance. Generally at low rpm, such as these engines run, it isn't all that noticeable. Start pushing rpm up a bit, say the 1900 - 2000 rpm area and it becomes noticeable. My M w/ firecraters is exactly this way.
Over the years who knows what has been done to your engine. It very well might have a mixture of parts from bore to bore if maybe only one piston was replaced, etc. This would have a more adverse effect on harmonics within the engine.
An M is an internally balanced engine meaning that the balance is achieved via the crankshaft by removing or adding material to the crank throws to balance against the piston / rod assembly. There is no harmonic balancer on the front of the crank (unlike the majority of your car and truck engines) and flywheel balance is neutral.
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