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Author Topic:   Camshaft operations
jammin
Administrator
posted January 28, 2001 02:31 AM
Something I ran into this week...I put a new crane cam in a 383 I was working on...just a hydraulic camshaft. I had a rapping noise...just like a bad lifter coming from the engine....i took it down...thought the lobes might have been gone or something....that wasn't the case....I put two more lifters in and got it back running...same thing. I found a problem with the back of the cam...the surfacing was not turning the lifters correctly and it was causing a terrible lifter racket...it was a defective camshaft...I didn't realize how important the rest of the rotation was to keeping the lifter turned to keep the pressure off of one spot..I guess I know now, I just thought I would share that info with everyone so if the run into it one day..they might not have the trouble I have had.
I did forget to state that the lifters had a wear pattern on them as if they were not moving either.....you could see the small indention on the lifter where it was hitting every time. On the back side of the cam....all of the wear patters were showing up on right side of their travel...which showed that they were contacting offcenter of the lifter, which causes them to circulate and redirect the pressure....the ones that were bad, had a very even distribution of wear...no where near what the other had, which showed us that the cam was not circulationg the lifters...it was on the face flat..in which it would not circulate under those conditions. I thought it was very interesting.
hope i didnt put you to sleep.

jammin

[This message has been edited by jammin (edited January 28, 2001).]

awkwardjeff
Member
posted January 29, 2001 09:54 PM
Jammin, If you called the people that built the cam they will tell you, You didn't hone the lifter bores that is why they didn't turn in the bore like they needed.......It's NEVER their fault........we always hone ours and never had a problem after the first one years ago........Just a thought for everyone


jammin
Administrator
posted January 29, 2001 10:08 PM
Jeff....actually I did...

jammin

jammin
Administrator
posted January 29, 2001 10:12 PM
I did check for the movement when I put the 2 new ones in also...no problems...I have 4 lifters to show what the problem is. I have never run into this..but the cam definitely is at fault here. I usually buy my cam's through summit...they are replacing it, not costing me anything but teardowns...LOL I have never had problems with Crane cams, but I guess you have lemon's in even cady's.



awkwardjeff
Member
posted January 29, 2001 10:21 PM
Jammin, I'm glad to be a member of this site, especially NOW that I know you have a ton of pull with these people......I agree that most manufactures all have good products, but when it comes to racing parts none of them stand behind their stuff to much when dealing with a local Saturday night Joe....
I'm glad to hear they are willing to work with you on this problem...It say's a lot of you and them....Jeff


fury
Member
posted January 31, 2001 01:10 AM
All camshaft companies don't produce all the cams that are in their caltalog. I used to work for 2 different camshaft manufacturers in Grand Haven, MI. One is Engine Power Components and the other is Federal Mogul (was Weyburn-Bartel). They both made camshafts for Comp, Crane, Isky, etc. The quality control on aftermarket camshafts at those facilitys aren't the best. They get most of there work from the OEM's. Do you still have the camshaft Jammin? If so, what is the casting number? It is usually found by the rear bearing.

[This message has been edited by d4490 (edited January 31, 2001).]

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