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Old 11-24-2011, 05:29 PM
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RPM's, Torq,HP cause main caps to walk??

What is the primary culprit in Main caps "walking"
Is this mainly a derivitive of high rpm and HP?
I would think sustained high rpm would be a big factor.
If you have a low rpm 650hp motor at an occasional 5000 rpm vs a 500hp 7000 sustained rpm motor like in a circle track car, i would think the Mains would ?walk" first in the lesser HP motor ??


Last edited by bigalow; 11-24-2011 at 05:40 PM.
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Old 11-25-2011, 08:07 AM
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I'd say... poor cap fitment, incorrect fastener torque, rotator imbalance, and sustained high RPM's could all be factors.

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Old 11-28-2011, 12:21 PM
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Lets say the caps start walking at 6500rpm, I would think that the caps would "walk" anytime the engine is at 6500rpm, sustained or not. Obviously if the rpm at which the caps walked/deflected was held for a sustained period of time, a greater amount of wear would occur.

Wear related to capwalk is directly proportional to the duration of time that the caps are walking/deflecting.

I guess that this is where a GEN 3/4 engine would shine with its 4 vertical bolt, 2 horizontal bolts that hold the caps in place, along with the caps fitting tightly between the lower portion of the deep skirted engine block.

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