Eric's cam challenge

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Very interesting. Comp cams quality control has been in a downward spiral for a few years now.
 
replicaracer43 said:
Very interesting. Comp cams quality control has been in a downward spiral for a few years now.
Click to expand...
This spring I had a customer who thought there was a problem with a BBM roller I’d sold him.
I had Comp run it thru the Adole 911 laser camshaft measuring machine……..way more accurate than a cam dr.

That particular cam measured out excellent, not just the lobe accuracy, but bearing roundness and runout, lobe runout, bank angle accuracy, etc………he had other issues.

What I found interesting is Eric was comparing data derived from two different machines.
I wonder if he would accept flow numbers from someone else’s bench, or if he’d want numbers from his own.
Oh wait, we know the answer to that.

I can only think of a few of cams that I measured that strayed pretty far from the specs on the card.
This was like 25 or so years ago.
One was a Herbert roller for a SBC, and two were NHRA stocker cams for a Pontiac.
 
PRH said:
This spring I had a customer who thought there was a problem with a BBM roller I’d sold him.
I had Comp run it thru the Adole 911 laser camshaft measuring machine……..way more accurate than a cam dr.

That particular cam measured out excellent, not just the lobe accuracy, but bearing roundness and runout, lobe runout, bank angle accuracy, etc………he had other issues.

What I found interesting is Eric was comparing data derived from two different machines.
I wonder if he would accept flow numbers from someone else’s bench, or if he’d want numbers from his own.
Oh wait, we know the answer to that.
Click to expand...
Very good point
 
I’m not saying that what Eric found is impossible, but If I were Joe Carrol I’d be sliding that cam in a block and measuring it up for myself.
 
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PRH said:
I’m not saying that what Eric found is impossible, but If I were Joe Carrol I’d be sliding that cam in a block and measuring it up for myself.
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I think the biggest take away, is if you dont measure it, you dont know for sure. Common sense really, but the vast majority of DIY engine builders and hobbyists look at the cam card and assume the cam is ground to those specs.
 
PRH said:
I’m not saying that what Eric found is impossible, but If I were Joe Carrol I’d be sliding that cam in a block and measuring it up for myself.
Click to expand...
Eric and Daniel (Powell machine) both said they see that a bunch from comp cams. I sure hope that isn’t true.
 
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