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Fixing a cam?

General engine tech -- Drag Racing to Circle Track

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econo racer
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Fixing a cam?

Post by econo racer » Mon Feb 10, 2020 12:53 am

I have a BBC solid roller with one damaged lobe. Not real bad but ground down some. How much does it cost to repair this? Or is it better to buy a new one?

rebelyell
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Re: Fixing a cam?

Post by rebelyell » Mon Feb 10, 2020 10:42 am

JMO: If your BBC solid roller cam is an off-the-shelf piece, it could be cheaper to buy a new one.

Suggest you ask one of the many re-grinders for advice: CamCraftCams, Crower, Egge, OregonCamshaft etc

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Re: Fixing a cam?

Post by pdq67 » Mon Feb 10, 2020 11:37 am

rebelyell wrote:
Mon Feb 10, 2020 10:42 am
JMO: If your BBC solid roller cam is an off-the-shelf piece, it could be cheaper to buy a new one.

Suggest you ask one of the many re-grinders for advice: CamCraftCams, Crower, Egge, OregonCamshaft etc
May I add, "Delta", out in the NW if they are still around?

pdq67

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Re: Fixing a cam?

Post by 1972ho » Mon Feb 10, 2020 12:36 pm

I had a flat tappet solid cam welded and reground and still have it running it was welded by webcam in Riverside Ca and sent back to bullet to be ground it was 75.00 for the welding and 75.00 for the grind.

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Re: Fixing a cam?

Post by Krooser » Tue Feb 11, 2020 1:55 pm

Mike Jones can fix it...
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CamKing
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Re: Fixing a cam?

Post by CamKing » Tue Feb 11, 2020 2:10 pm

Krooser wrote:
Tue Feb 11, 2020 1:55 pm
Mike Jones can fix it...
It would depend on how bad it's damaged.
The other issue would be, having a lobe profile close to what's on it.
It's always best, to contact the company that made the cam, since they'll have the exact profiles to grind back on it.
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jeff swisher
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Re: Fixing a cam?

Post by jeff swisher » Tue Feb 11, 2020 8:13 pm

Or the guy grinding it could cut a master off of a lobe that was good.

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Re: Fixing a cam?

Post by mt-engines » Wed Feb 12, 2020 12:18 pm

jeff swisher wrote:
Tue Feb 11, 2020 8:13 pm
Or the guy grinding it could cut a master off of a lobe that was good.
Yeah, im sure thats more cost effective than going to the person with the original master.

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Re: Fixing a cam?

Post by jeff swisher » Wed Feb 12, 2020 1:01 pm

Yeah, im sure thats more cost effective than going to the person with the original master.
[/quote]

People brings cams into the local cam shop all the time with bad lobes and some of those cams have been around longer than the company that built the cam.
If you have spare masters and the cam is a pretty nice profile that you do not have you cut a master and now you do have it.

But you are right if the cam can be sent back to the guy with the master it should be more cost effective.

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Re: Fixing a cam?

Post by CamKing » Wed Feb 12, 2020 1:17 pm

jeff swisher wrote:
Tue Feb 11, 2020 8:13 pm
Or the guy grinding it could cut a master off of a lobe that was good.
You never want to do this, unless there are no other options available.
When you grind a lobe off of a master, that lobe is a copy of the master lobe, but tolerances and wheel size variations make it less then a 100% accurate copy.
Now if a cam company makes a master off of one of the cam lobes, that master is now a copy of a copy, and the accuracy drops even more. If the lobe he measured to make the new master was worn at all, that also drops the accuracy.
Now he takes that master, and grinds the bad lobe, so now that lobe is a copy of a copy of a copy, with so many copying errors that it could cause major issues to the rest of the valvetrain.
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Re: Fixing a cam?

Post by jeff swisher » Wed Feb 12, 2020 4:56 pm

Thanks CamKing I can see all that happening now that you said it.

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Re: Fixing a cam?

Post by econo racer » Thu Feb 13, 2020 12:29 am

It is an old Lunati.

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Re: Fixing a cam?

Post by CamKing » Thu Feb 13, 2020 9:38 am

econo racer wrote:
Thu Feb 13, 2020 12:29 am
It is an old Lunati.
Take a couple pictures of the bad lobe, and email them to me: tech@jonescams.com
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Re: Fixing a cam?

Post by steve316 » Thu Feb 13, 2020 9:45 am

A new cam is the cheapest up grade you can do for high performance engine. With the new profiles that available you may pick up some HP with the new cam while your at it.

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