911 camshaft regrind reccomendation

erobinson · 11-11-2004, 08:07 PM

Engine: CIS 2.7 of 76 vintage

Issue: Trashed lobe+rocker

Was reassembling part of my topend tonight when I came across one of my cams has a series of flat spots on the high area of the lobe, and the pad on the rocker has a series of flat spots as well. I know the rocker and cam is probably garbage but I wanted to ask if it (and its mate) could be reground to the 964 grind. The flat spots are not too bad, but could be signifigant if the grind is close to original.

Also, i have heard of reconditioning rockers for running on a new/reground cam, I KNOW this one can not be reconditioned, but I what exactly does that entail? Do the reconditioners regrind the pad?

As a last note, are the sources given in the extracting power from a CIS rebuild still valid and considered good sources? What about the guy who sells 911 cams on ebay? Anyone had any dealings with him?

jluetjen · jluetjen's Garage

As far as the guy selling cams on E-Bay -- do you mean Cam Dr? If so, John posts here all the time. Do a search under "Cam Dr."

Jim Richards · 11-12-2004, 03:35 AM

or under his Pelican name "camgrinder"

erobinson · 11-12-2004, 04:16 AM

cool, I will look into it thanks

jluetjen · jluetjen's Garage

Thanks Jim -- I stand corrected. His user name is "camgrinder", think his business is called "Cam Dr."

jpnovak · 11-12-2004, 07:56 AM

You can also find him at his new business. he lists which cams can be reground on cores and which are welded and reground. Look at the application notes.

www.drcamshafts.com

kstylianos · 11-12-2004, 08:42 AM

Check the cam squirters in the tower for blockages, or you could be doing this exercise again.

erobinson · 11-12-2004, 09:24 AM

yeah, I had actually placed my cambox+cam in the parts washer and applied fluid to look at this and saw where I had a few that were partially clogged, that one is completely clogged

kstylianos · 11-12-2004, 10:31 AM

Good find. Better now than later (again).

erobinson · 11-12-2004, 10:34 AM

I am looking at maybe also using my cams+boxes off the other 2.7 with the trashed cylinders.

Eli

hobieboy · 11-12-2004, 10:36 AM

sorry to be a bit off-topic...

Now I am confused - I thought camgrinder used to be with Elgin Cams? Guess he started a new, independent business? Or is there still a relationship?

camgrinder · 11-12-2004, 07:09 PM

I havent tried to grind a 2.7 into a 964 in a long time. I will look at my records and see if it can be done. I do have plenty of SC profile on 2.7 cams in stock.
To clear things up about me, I am no longer at Elgins. I do have my own business now. Dougherty Racing Cams, www.drcamshafts.com

Thanks Jamie, you always post nice things about me!

erobinson · 11-12-2004, 07:45 PM

are the SC profiles a worthwhile investment on a 2.7 with stock compression and CIS?

I rummaged through my other engine and found two very servicable stock 76 cams and boxes.

The other boxes are slightly worn, has anyone ever tried lineboring and fitting these with knockin sleeve bearings?

jluetjen · jluetjen's Garage

Or you could line bore them out to the larger SC-and-later ID and then use some 964 cams.

jpnovak · 11-13-2004, 05:07 AM

John, I don't mind spreading the word when a vendor comes down to our DIY/tech area and provides excellent information. I feel its important to keep your resources around.

Yes, you can bore them out to the larger diameter. I would suggest this over the bearing sleeve. Doing this would cause you to run a 4 journal cam in a 3 journal housing. I have heard this does not cause any problems.

Another option is to pick up new (used) cam towers. These are usually very cheap since there is not a big market for them.

MotoSook · 11-13-2004, 05:15 AM

Who's put a 4 journal cam in a 3 journal housing? I'm intrigued.

erobinson · 11-13-2004, 06:30 AM

if I have them line bored to the larger diameter (49 mm vs 47 isnt it?) Then I would only need locate 964 cams and preferably rockers matched to the cam then remove the power steering drive and I am in business.

My housings have the place for the fourth journal, just the oil hole hasnt been drilled through. I assume this would be the only thing to do. Press out the squirter bar(to prevent metal chips from entering the squirter bar and clogging a nozzle) , drill the hole, reinstall squirter bar.

Yeah...and pigs fly using antigravity. I imagine that bar would be a PITA to get out.

I think I may get a set of 964 cams, or get some of those SC cams from John a little later.

camgrinder · 11-13-2004, 06:40 AM

Another option is new billets. I do have blanks with 4 main journals that are 47mm. Some 47mm cam housings only have 3 journals so the extra journal isnt used, some have 4 main journals and that journal would have to be drilled for oiling.