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Old 01-15-2014, 01:44 PM   #29
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Quote:
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Well, the pin is simply there for initial alignment; it's the bolt's job to hold things tight enough to keep anything from slipping. Something would have had to seize suddenly to break the clamping force of the bolt enough to allow the pin to shear. Or, the bolt simply stretched or loosened for whatever reason. Still, only speculative.

I had my three-bolt up and running and, out of paranoia, rechecked a couple of specs. I found out that the torque I applied to the cam bolts was incorrect, because the spec I used was incorrect. I had to take the front cover off a second time to correct it.

There were a few swear words incorporated during that second endeavor.
Ugh....... i know what you mean. I enjoy working on my cars to make them better.

I HATE going back and fixing broken shit to just put it back the same or having to go back in for a mistake.

Or something you forgot. I forgot to torque a cam sprocket on my sons Jeep a few months back. Sucked but it's an overhead cam to I was able to lift the valve cover.
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Old 01-15-2014, 02:18 PM   #30
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Decel and then a quick accel?

I'd think they'd engineer these better. This is nothing to play with. So easy just to go 3 bolt in the first place.
A local car had his bolts back out of his 3 bolt cam.
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Old 01-15-2014, 02:20 PM   #31
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I really want to put a cam in but really most people are getting 20-50k miles before something goes boom in the engine? Is that really what a lot of you are dealing with? I know you gotta pay to play but Damn.

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Old 01-15-2014, 02:43 PM   #32
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I really want to put a cam in but really most people are getting 20-50k miles before something goes boom in the engine? Is that really what a lot of you are dealing with? I know you gotta pay to play but Damn.

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I don't think that at all...if someone has a problem with a motor you're far more likely to see them posting about that vs. "been driving my cammed car for 60k and it's still great". So I think what you are seeing are a lot of horror stories.
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Old 01-15-2014, 02:46 PM   #33
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I don't think that at all...if someone has a problem with a motor you're far more likely to see them posting about that vs. "been driving my cammed car for 60k and it's still great". So I think what you are seeing are a lot of horror stories.
I agree with this as well. And you really don't hear thaaat many stories about people's cams failing compared to the number of people who have a cammed car.
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Old 01-15-2014, 03:18 PM   #34
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Quote:
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A local car had his bolts back out of his 3 bolt cam.
Yikes. But it would make the timing cover leak before the cam advanced. OR the cam bearings would wear.

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I don't think that at all...if someone has a problem with a motor you're far more likely to see them posting about that vs. "been driving my cammed car for 60k and it's still great". So I think what you are seeing are a lot of horror stories.
Yup. Agreed.

TONS of aftermarket cams installed out there. Lot's of failures but lot's of different reasons for failure too. And still a relatively small number of failures to installs.
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Old 01-15-2014, 04:12 PM   #35
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However I do think that there is a much higher percentage of after market cams fail to factory installed cams.
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Old 01-15-2014, 04:20 PM   #36
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However I do think that there is a much higher percentage of after market cams fail to factory installed cams.
Agreed, although the majority of OEM cams that fail do so because of a locked-up lifter roller.

Again, speculating...maybe our OEM lifters aren't as up to the task as we think they are. Added load from increased valve spring tension and higher lift may be causing the lifters themselves to initiate the failure of the cam.
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Old 01-15-2014, 04:33 PM   #37
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Agreed, although the majority of OEM cams that fail do so because of a locked-up lifter roller.

Again, speculating...maybe our OEM lifters aren't as up to the task as we think they are. Added load from increased valve spring tension and higher lift may be causing the lifters themselves to initiate the failure of the cam.
Could be but I changed my lifters, pushrods and springs when I had the cam done. LS7 lifters. Fairly mild cam.

I had 2 lifters pit up (still rolling) and slowly grind 2 cam lobes to where the finite metal wore the bearings out. Plus a few bits of metal got into the system as well. I'd have never known there was a problem if I hadn't lost oil pressure.
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Old 01-15-2014, 04:37 PM   #38
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I, too, ran Mobile 1 on my car. May be irrelevant but many of these failures seem to be running this particular oil. I don't know if it's actually related.

Mine started with the lobes/lifter rollers as well.
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Old 01-15-2014, 08:18 PM   #39
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A local car had his bolts back out of his 3 bolt cam.
Local car should have used loctite and a set of arp cam bolts. Bet it wouldn't of happened.
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Old 01-15-2014, 08:31 PM   #40
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I never got why gm veered off the 3 bolt path. Is it lighter, or were they just saving money?
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Old 01-15-2014, 08:32 PM   #41
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Loctite and a locking plate, my bolts aint going anywhere.
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Old 01-15-2014, 08:53 PM   #42
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Local car should have used loctite and a set of arp cam bolts. Bet it wouldn't of happened.
Yeah couldn't tell you. He had a few odd problems..
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