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Old 08-06-2016, 01:06 PM   #1
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Default 100 mile break in checkup, odd cam wear?

Hey guys, I put a little over 100 miles on my freshly built motor this week and I'm in the middle of changing the oil (posting from my phone).

I noticed an oval pattern on the cam lobes, is that normal? I googled it quick and there was some disagreement on other forums. These are bp4w cams out of a car with 130k. Running Pennzoil's SAE 30 for the first few oil changes.

While we're at it, anything else I should check on? I retorqued the head (65ftlb) already since it's been through a few heat cycles.

If I'm being paranoid, just tell me to shut up and drive it.

Thanks guys.
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Old 08-06-2016, 06:44 PM   #2
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I dug around a bit more after I got home and this appears to be totally normal. GFM.
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Old 08-07-2016, 04:52 PM   #3
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I have two VVT heads that have cam wear identical to that. I am still cautious of it, but I can't seem to find out why it happens.
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Old 08-07-2016, 11:23 PM   #4
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I'm going to keep an eye on it for sure. I was looking for any signs of oil contamination, etc. From what I googled this is work-hardening of the cam lobes. Probably worse with heavy springs.
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Old 08-08-2016, 01:02 PM   #5
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I went back through my emails and found where the a Spec Miata engine builder told me it was possibly the cam journals going bad. I inspected them and nothing was out of spec. I ended up buying a machined head from him, that has the cam journals line bored and they show the same wear pattern.
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Old 08-08-2016, 08:35 PM   #6
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My Kelford Cams look just like that, I have 3 stock heads on the bench...they all look like that. Don't sweat it.
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