Re: Advice on cam failure
Posted: Thu Jan 07, 2021 3:22 am
Quote:
"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".
Regards
Paul
"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".
Regards
Paul