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Original Message
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| That is an odd failure. |
| By Dave Shoe - 09/21/2002 1:06:33 AM; IP 67.4.128.212 |
I suspect the lifters were not designed for that cam. Whether the spherical diameter at the face of the lifter was incompatible with slope on the lobe, or it was maybe a mechanical cam matched to hyd lifters, or maybe a set of lifters with defective induction hardening, I can't say.
Dirt in the passages would not likely kill all the lifters. It wouldn't likely score the faces of any of them. It would just make some function poorly after a while.
I have heard for a while that there are some bad FE lifters out there. I can't see FM offering them for sale, though.
I don't quite understand the "continuous 2000 RPM" technique. It's been a while since I've reviewed cam break-in procedures, but I recall varying the RPMS during the first several minutes of break-in to prevent hot spots(?) on the lifter or lobe. I don't know where I read this, or whether it's good logic, but it worked in my case. I seem to recall that holding one steady RPM was not recommended by mthat particular cam manufacturer.
How long before you first noticed the noise?
Also, how did the oil pressure look (if a gauge was hooked up)?
I suspect a full teardown is in order, but that's just my way of doing things.
Shoe. |
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