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Registered
Join Date: Aug 2005
Location: sydney australia
Posts: 138
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cams hardenning chipped
When I pulled the cams out I noticed that on one lobe of each cam I had about 1/8" square in area of delamination of the hardening. Does anyone know if this type of damage can be repaired? Has anyone else had this problem? Has Porsche had a bad batch of cams gone through do you think? Could this be a lubrication issue? (I use 25W50 Valvoline GP50 and this has been the lube before I got the car) although there is no signs of scuffing on the other lobes or rockers.
Any opinions appreciated.
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'83 911SC |
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06-02-2006, 04:59 PM
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Join Date: May 2003
Posts: 3,346
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This seems to be common. The cams can be reconditioned and should be fine after. You need to recondition the rockers as well so they wear together.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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06-02-2006, 05:02 PM
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I have the same thing on 3 exhaust and 2 intake lobes on the 2 cams. They have 235,000 kms on them. I will just run it for another couple of years (only 10 - 15,000 kms) and then redo the cams with new rockers. As I understand it, there is a good place in California that reconditions (weld and regrind) the cams.
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1982 911 SC Targa - Rosie....my Mistress. Rosewood Metallic on Dark Brown and Black. Long distance road warrior and canyon carver. A few mods - a little interior, some brakes, most suspension and all of the engine. |
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06-02-2006, 05:18 PM
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Join Date: Jan 2003
Location: Langley,B.C.
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John (camgrinder) is your man for cams and rockers....
This wear is quite prevelant on the SC motors.... Cheers
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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06-02-2006, 05:58 PM
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Join Date: Oct 2001
Location: Momence, IL 60954
Posts: 1,911
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If the engine has lots of miles, I could say that it is normal wear and tear, but we've seen lots of cam problems in the last few years, as the EPA has mandated a reduction or elimination of ZDDP from motor oils. Most definately it could be a lubrication problem, but it might not be the sole cause of the wear. Also proper break in has lots to do with wear patterns and accumulated wear.
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Charles Navarro President, LN Engineering and Bilt Racing Service http://www.LNengineering.com Home of Nickies, IMS Retrofit, and IMS Solution |
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06-02-2006, 06:01 PM
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Join Date: Mar 2005
Location: Northern CA
Posts: 4,703
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contact camgrinder...on this forum
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Sold: 1989 3.2 coupe, 112k miles |
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06-03-2006, 08:09 AM
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Join Date: Aug 2005
Location: sydney australia
Posts: 138
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thanks guys your ideas have been helpful. I will try to find someone local (in Sydney) to look at rebuilding the cams.
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'83 911SC |
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06-03-2006, 01:18 PM
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Location: Northern CA
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you may want to check the cost of shipping compared to issues with unproven cam repair shop... of course if there is a guy that really knows these cams and cam fix in Sydney...by all means.
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Sold: 1989 3.2 coupe, 112k miles |
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06-06-2006, 04:13 PM
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Rosie
