What causes this damage to a cam?
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What causes this damage to a cam?
I just pulled this cam out of my car because Im going with a different setup. I noticed some rough spots on two of the lobes. I dont really know what causes this (bad lifter?), or if the cam is usable anymore. I had intentions of selling it, but dont want to screw anyone.
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Im replacing the lifters either way, but I found very minor abnormal wear marks on only 1 lifter, and the rollers on all of them seem fine (may not be fine at engine rpm though). Heads are removed already, they are at the shop being cleaned and inspected. New lifters were in the plans already, custom grind cam will probably be ordered this week.
Thanks for the replies.
Thanks for the replies.
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Likely causes:
1. Insufficient valve spring seat force and stiffness to keep up with cam
2. Pushrod flex
Less likely but could also be:
3. Improper heat treatment of cam
4. Improper heat treatment of lifter roller
5. Inadequate lifter roller material properties (less expensive steel)
If only two lobes, check the valve springs. Also, lifters likely need replacement as well.
1. Insufficient valve spring seat force and stiffness to keep up with cam
2. Pushrod flex
Less likely but could also be:
3. Improper heat treatment of cam
4. Improper heat treatment of lifter roller
5. Inadequate lifter roller material properties (less expensive steel)
If only two lobes, check the valve springs. Also, lifters likely need replacement as well.
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Full-Force: Its not a futral cam.
vettenuts: Im running GTP Stage 2 heads which come with springs that should be able to support the lift on this cam. Along with that I have comp chrome moly push rods, but have stock lifters. Most of my valvetrain is being replaced either way: cam, springs, pushrods, lifters, & timing chain. Thanks.
vettenuts: Im running GTP Stage 2 heads which come with springs that should be able to support the lift on this cam. Along with that I have comp chrome moly push rods, but have stock lifters. Most of my valvetrain is being replaced either way: cam, springs, pushrods, lifters, & timing chain. Thanks.