Has anyone used a reground cam? What was your experience?
Dave
"It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance." -Thomas Sowell
June 28, 2022, 03:20 PM
Roger McGinnis
quote:
Originally posted by David Covey: Has anyone used a reground cam? What was your experience?
Dave
I think it's okay if the original would have been to much to start with. I would use LSM for such a deal.
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June 28, 2022, 03:27 PM
Mike Rietow
Lunati did one for I. Had a little tiny nick in the nose of the cam, from a rod bolt.
sbc 434 no raised cam block, of course.
I'd imagine any good cam grinder can do it, with their eyes closed.
June 28, 2022, 03:33 PM
Goob
Bullet Have your plan in mind and call.
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June 28, 2022, 03:34 PM
183N
quote:
Originally posted by David Covey: Has anyone used a reground cam? What was your experience?
Dave
Had a very similar cam reground in to what we needed. 50 runs later during routine inspection we found a lobe that was wearing out. Conclusion we came to was the regrind went through the hardening and they either didn’t harden it again or thought it didn’t need it.
June 28, 2022, 03:41 PM
TOP38
That's a depends question. I would not do it without talking to the original cam company, they need to know the core they used and the new profile you want. If it requires to much grinding which causes the surface to get to close to the extent of the hardening, it will fail shortly in use.
If it's a tool steel core, you are good to regrind!
June 28, 2022, 03:42 PM
wideopen231
Had one of my Blower cams reground for my Hemi and so far so good. Only half dozen runs on it , so probably to early to say good or bad. Now I only had 10* ground out of cam in hopes of not needing too much removed and being ground past hardness.This message has been edited. Last edited by: wideopen231,
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June 28, 2022, 07:21 PM
David Covey
It is a LSM roller cam, billet steel.
Going past the hardening is my concern. Oregon cams said they would not harden it cost more than buying new.
I have a comp cam that I think will clean up no problem but the LSM one was hit fairly hard. I would like to use the LSM cam.
"It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance." -Thomas Sowell
June 28, 2022, 07:42 PM
SCDIV1
Scrap....
June 28, 2022, 07:55 PM
Wooley
What’s the possibility of getting a new cam ground to match the lsm cam you want to use? In my opinion that cam is already beyond re use.
June 28, 2022, 08:16 PM
Curly1
I am pretty sure that is past saving.
https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge.
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June 28, 2022, 08:24 PM
David Covey
quote:
Originally posted by Curly1: I am pretty sure that is past saving.
That's pretty much where I'm at. Just hate to not see what I could do.
Wooley, This is the 2nd exact cam I have bought from LSM. Looks like they will get to grind me another one..
Dave
"It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance." -Thomas Sowell
June 29, 2022, 06:06 AM
SCDIV1
I had a valve train issue that bit me twice and I tossed 2 R-M #420-116 cams in the dumpster
Reground cams will end up smaller and weaker The deeper the damage the more it would need to be ground The more it gets ground it will reduce the O.D. of the base circle
Years ago we had cams reground and those cams broke more parts.....led to valve float and bad harmonics up into the top end...
Todays cams are going bigger to better deal with higher spring pressures commonly run....
June 29, 2022, 03:15 PM
wideopen231
I would call it kids souvenir at that point and I am broke dyck.
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June 30, 2022, 05:52 AM
434 olds
Throw that shyt in the garbage.
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June 30, 2022, 10:18 AM
1320racer
a repaired/reground cam nor a repaired/welded/ground crank belongs going back in a race engine.
June 30, 2022, 10:24 AM
RPROGAS
There's no correct answer for every case, some can be saved and some are going in the scrap bin. I've experienced both cases and been successful with a marginally damaged cam, just be aware that it can influence the valve train geometry.
Bob
June 30, 2022, 12:32 PM
David Covey
OK Guy's I got it.. Not worth doing, so I will just get another one, and toss the ones laying around.
If I could melt the broke dyke cams I have laying around I could probably build a car with the metal. I just hate to throw them away IF they could be used. This is actually the first time I had thought of regrinding them.
Dave
"It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance." -Thomas Sowell
June 30, 2022, 01:44 PM
Al Alguire
You can have cams reground but there is not really any real room to change things much due to the heat treat, it simply does not get that deep. Also some of these companies seem to like to grind new stuff really close to the base circle new which leave nothing. Having said that the one you pictured is now "art".
"I am not ashamed to confess I am ignorant of what I do not know." Marcus Tullius Cicero
June 30, 2022, 01:46 PM
Canted Valve
Not knowing the limitations of regrinding, I sent a cam in, for analysis, with much less damage and all I accomplished was wasting money on freight. While they didn't laugh to my face I always suspected they were chuckling under their breath at such a rookie.
