Good article with Jon Kaase on piston balancing.

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Re: Good article with Jon Kaase on piston balancing.

Post  rmcomprandy on March 8th 2018, 7:21 pm


That is the main reason that production connecting rods break just below the pin.  When running, the rod is usually not centered in the piston, (front to back), so at overlap, the tensile forces on one side is greater than the forces on the other side which causes the rod to bend very slightly just below the pin and after a while it breaks.
Making one side of the piston lighter than the other can help some however, getting the rod-offset to place the rod pin end in the center of the piston is really what it takes.

A smaller offset of the rod pin end in the piston usually won't matter much at a lower RPM but, as RPM gets greater it will make more and more difference.

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Re: Good article with Jon Kaase on piston balancing.

Post  bruno on March 9th 2018, 11:53 am

Thank you for the read Doug !!
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Re: Good article with Jon Kaase on piston balancing.

Post  Frank Merkl on March 14th 2018, 1:20 am

All I know is Kaase is my mentor ! my engine god!
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