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Weight/throttle question.


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cause of the friction between the bearing and the crank , created by the force of the piston(weight), decelerating and accelerating away again. the turnover. almost like the crank is turning faster than the piston can go up and down , like its falling behind. that or was low on oil maybe , lol.

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Somewhat.

 

The big end deforms slightly causing the bearing to come in contact with the crank, and you have yourself the beginning of a spun bearing.

 

Lighter pistons will help against this.

 

Aftermarket rods will if they are designed correctly. Look at OEM rods (we're talking big end here). They have one rib in the center. Now look at a RM/Eagle/TT rod, they have two ribs, one on each side. This keeps the big end from deforming.

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Not rod stretch. The big end distorts, but the rod doesn't stretch. Kind of weird. I thought about this a few weeks ago then called up Brad to see if he has done any testing. Showed me a vid made with a high speed camera.

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