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.
Posts: 752 | Location: Upstate NY | Registered: July 02, 2013
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!
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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Posts: 4440 | Location: United States of Texas | Registered: April 02, 2011
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....
Posts: 2735 | Location: Where ever I am, I'm here and it's me | Registered: March 15, 2007
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
Posts: 3307 | Location: Lakeside, Ca | Registered: February 15, 2003
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
Posts: 3384 | Location: American By Birth Texan By The Grace Of God | Registered: April 29, 2004
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
Posts: 1071 | Location: Las Vegas, NV | Registered: April 14, 2004
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.
Illegitimi non carborundum
Posts: 2399 | Location: OKC, OK | Registered: February 15, 2008
