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Old 07-02-2008, 03:39 PM
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How does my old cam look?

Took this out due to losing a few thou off the lobes and suspect wear on the lifter faces. It's an Edelbrock Performer RPM hydraulic flat tappet. How does it look in terms of wear patterns, etc? It was in for 6k miles. You can't really see, but in the last pic, there was just the beginning of some pitting starting to appear on the edges of the lobe. A couple of other lobes were like this, too.

















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Old 07-02-2008, 04:14 PM
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Looks like it was not getting enough oil. Almost looks like it got hot. Hard to tell from pictures. They can be deceiving

Chet
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Old 07-02-2008, 04:18 PM
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Exact same cam failure

Hmmm... That's interesting. I just replaced the very same cam in my project car also. How was yours performing before replacement? Was it operating normally? When and where did you purchase and install that cam? I had less than 1000 miles on mine and it was terrible.
When I removed the cam, I noticed some very similar wear marks. I'm no genius when it comes to divining cam wear patterns, but something was wearing unevenly, I can only venture a guess and say that it may be due to bad heat treatment or possibly bad break-in procedure (i.e. oil breakdown, overheating during break- in, lack of zddp in oil, etc.).
Let's see if we hear from some of the experts out there.
TR
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Old 07-02-2008, 04:44 PM
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Quote:
Hmmm... That's interesting. I just replaced the very same cam in my project car also. How was yours performing before replacement? Was it operating normally? When and where did you purchase and install that cam? I had less than 1000 miles on mine and it was terrible. When I removed the cam, I noticed some very similar wear marks. I'm no genius when it comes to divining cam wear patterns, but something was wearing unevenly, I can only venture a guess and say that it may be due to bad heat treatment or possibly bad break-in procedure (i.e. oil breakdown, overheating during break- in, lack of zddp in oil, etc.).
Your last pic looks pitted (ctr)
Quote:
Hard to tell from pictures. They can be deceiving
can you post pics of the lobes/lifters close-up (worst)?

That heat treat theory has no merit, IMHO most failures are from not doing it right, using the wrong oil, or too much pressure.
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Old 07-02-2008, 04:51 PM
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Quote:
Originally Posted by Stroke
Your last pic looks pitted (ctr) can you post pics of the lobes/lifters close-up (worst)?

That heat treat theory has no merit, IMHO most failures are from not doing it right, using the wrong oil, or too much pressure.
Here's a pic of a lifter face...




This is typical of all the lifters that were in there (except for 2, which were normal-looking... shiny with a concentric circular wear pattern).

The last pic does indeed attempt to show pitting (minor) in the peak of the lobe. Most of the lobes have minor pitting towards the distributor end of the lobe.
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Old 07-02-2008, 04:54 PM
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Quote:
Originally Posted by 540z
Hmmm... That's interesting. I just replaced the very same cam in my project car also. How was yours performing before replacement? Was it operating normally? When and where did you purchase and install that cam? I had less than 1000 miles on mine and it was terrible.
When I removed the cam, I noticed some very similar wear marks. I'm no genius when it comes to divining cam wear patterns, but something was wearing unevenly, I can only venture a guess and say that it may be due to bad heat treatment or possibly bad break-in procedure (i.e. oil breakdown, overheating during break- in, lack of zddp in oil, etc.).
Let's see if we hear from some of the experts out there.
TR
The engine was performing fine.

I've only recently acquired the car. The cam install was done professionally by the guy that built the engine 6k miles ago. Not sure if he broke it in, or if it was broken-in by the customer.
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Old 07-03-2008, 06:19 AM
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I thought 4X beer was only sold in Australia....where did you get that stuff?
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Old 07-03-2008, 06:22 AM
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Quote:
Originally Posted by Double_v23
I thought 4X beer was only sold in Australia....where did you get that stuff?
From the local supermarket... it's available off the shelf here in the UK

Cheers,
Ian.
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Old 07-03-2008, 06:33 AM
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We can't get it over here but I liked it when I was in Brisbane on leave from the Marine Corps.
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Old 07-03-2008, 07:02 AM
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Did you check the lobes with a micrometer or a dial caliper? That would give you a good idea of how much wear was in the cam.

Looking at the lifters if they all had the same cirular pattern then they were acting like they were supposed to and I would assume operator error on the break in.
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Old 07-03-2008, 07:06 AM
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Quote:
Originally Posted by Double_v23
Did you check the lobes with a micrometer or a dial caliper? That would give you a good idea of how much wear was in the cam.

Looking at the lifters if they all had the same cirular pattern then they were acting like they were supposed to and I would assume operator error on the break in.
Checked lobes with a digital vernier caliper and the worst lobe was about 0.010" down. The lifters all looked like the pic I posted above, except for 2, which looked shiny with concentric circular wear pattern. The dull looking lifter face was common to 14 of the 16 lifters.
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Old 07-03-2008, 07:28 AM
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I would say that is pretty normal wear, but may be a little much for a low mileage motor.

I would say definate signs of improper break in then.
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Old 07-06-2008, 12:49 AM
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what were the condition of the cam bearings?
because I got a motor with low mies but the cam looked like your but a little worse and the bearings were just totally grooved, chipped, and carved lol I wanted to know if it happened to you because we both know we had a bad break in but would that usually also cause the bearings to go bad to like from to much heat or no lubrication? or this is just because my oil pump got plugged or something, but my main bearings were pretty nice. how were the rest of the bearings in your engine?
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Old 07-06-2008, 02:42 AM
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looks like the cam might have sat sometime before the engine was built and got some surface rust on it maybe...
or maybe a bad forging..
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Old 07-17-2008, 08:49 PM
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v8hed,

what did you finally figure out with your cam/lifter wear pattern?
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