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Old 04-13-2019, 02:26 AM   #21
Beat68CST
 
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After taking shipment of cam, make sure it's straight.

A good engine builder should be able to check and straighten one...
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Old 04-13-2019, 09:11 AM   #22
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Quote:
Originally Posted by DISTURBED View Post
My gut says this isn't a billet steel cam. I can't remember the last time I heard a billet steel cam breaking. Cast is a different story.
X2

Two years ago I had a customer with a 2.5 engine, 4v with a 13mm. He broke a cam similar to what you are describing, one look at the core, never again will I install that brand cam in a competition build. Since switching to no limit cams, I havenít had any questions, concerns or problems.

And 103# at what height? That number means nothing. I understand that itís advertised as such, but testing springs at the installed height is crucial, imo....

Iíd be inspecting the gear lash and thrust on all components, the clearance between the cam and journals, straightness of cam,,, exc. pretty standard assembly.
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Old 04-13-2019, 09:17 AM   #23
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No limit cams is where itís at imo
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Old 04-15-2019, 04:30 PM   #24
Yotadzl

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Quote:
Originally Posted by DISTURBED View Post
My gut says this isn't a billet steel cam. I can't remember the last time I heard a billet steel cam breaking. Cast is a different story.
You are right, I should have just said steel cam. Most of them are advertised as being machined from new steel billets, but I believe it is a cast steel blank. That being said, the manufacturer claimed to have not seen another one break without other mechanical failures causing it to bind and break.
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Old 04-15-2019, 04:36 PM   #25
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Quote:
Originally Posted by TheHammer View Post
X2

Two years ago I had a customer with a 2.5 engine, 4v with a 13mm. He broke a cam similar to what you are describing, one look at the core, never again will I install that brand cam in a competition build. Since switching to no limit cams, I havenít had any questions, concerns or problems.

And 103# at what height? That number means nothing. I understand that itís advertised as such, but testing springs at the installed height is crucial, imo....

Iíd be inspecting the gear lash and thrust on all components, the clearance between the cam and journals, straightness of cam,,, exc. pretty standard assembly.
Ya I'm starting to think I shouldn't trust what I am being told by the manufacturer. I trust my engine builder and have not had this type of issue over multiple builds in the past. I will certainly be checking all those things when I tear it down. Thanks for your input.
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Old 04-15-2019, 06:33 PM   #26
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Do you care to enlighten us on what brand of cam? Not looking to bash, just would like to know.
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Old 04-15-2019, 09:41 PM   #27
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Do you care to enlighten us on what brand of cam? Not looking to bash, just would like to know.


Iíd rather not at this point. I donít want to bash anyone until I figure out what the actual problem is.


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Old 04-16-2019, 07:42 AM   #28
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Iíd rather not at this point. I donít want to bash anyone until I figure out what the actual problem is.


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Understandable.
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Old 04-16-2019, 12:25 PM   #29
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Any pictures of the parts? Stock cam gear?

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Old 04-16-2019, 05:23 PM   #30
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Click the image to open in full size.Click the image to open in full size.
Hereís a few pictures of the first broken cam.


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Old 04-16-2019, 05:53 PM   #31
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Click the image to open in full size.Click the image to open in full size.
Hereís a few pictures of the first broken cam.


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Iím sure thatís cast.
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Old 04-16-2019, 06:10 PM   #32
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OK, after seeing pictures, I'm sticking with my first thought, I believe this is a gear out of concentricity, and cycling side load as it rotates. I would look for an odd or dual wear pattern on the cam gear and those in mesh with it.

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