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Advice on cam failure

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Posts: 194
Joined: Fri May 19, 2006 12:05 am
Location: Western Australia

Re: Advice on cam failure

Post by blown265 »

"Almost sounds like these holes needed to be graded in size with the largest at the back running down to the smallest at the front."

That's very close the way I modify them- the two rear "primary supply" holes from block to head I open up to 9/16", and the first two rear steam holes are taken to 3/8" and 5/16". The remainder are left at a clean 1/4". Not quite graduating/grading, but the same principal as you describe.
Next block I do for myself, I'll look into taking the passages out closer to a "largest to smallest".
Posts: 1155
Joined: Fri Jun 30, 2006 9:37 am

Re: Advice on cam failure

Post by stealth »

Someone dropped the cam ..Crack took time to propagate .... mark in bearing is from end of life dance just before complete failure.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.
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