Worn GT Cams - Can they be fixed?
07-24-2015, 10:50 AM
#1
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Worn GT Cams - Can they be fixed?
Have a set of GT cams from a 250k mile car. The lobes are worn to the minimum specs.
Can these be fixed?
Can these be fixed?
07-24-2015, 11:41 AM
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07-24-2015, 11:54 AM
#5
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Most sets of GT cams that I have seen are worn and pitted. Why I have no idea - that applied to both low mile and high mile.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
07-24-2015, 11:58 AM
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Roger.. that. I attribute to less than optimal maintenance and the high miles.
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07-24-2015, 01:23 PM
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Worst case scenario - $2500. I need to see if all the lobes need to be welded.
07-24-2015, 05:29 PM
#10
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can webcams take care of my missing tooth GT cams ??? (the original Holbert cams?)
after seeing andersons and Fans cams with bolt on gears it made me think that something might be possible. plus there is a 944 cam guy from canada that has been doing that modification and repair for many years with no issues.
after seeing andersons and Fans cams with bolt on gears it made me think that something might be possible. plus there is a 944 cam guy from canada that has been doing that modification and repair for many years with no issues.
07-24-2015, 05:46 PM
#11
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Mark, do you have a picture of the stamped numbers on the (rear) ends of the Holbert cams? Would be interested to know what the two digit numbers are.
I have been meaning to take the exhaust cams from the Zombie out to have 1 tooth fixed on each of them, Webcams quoted $275 a cam to do it last fall but I haven't managed to get out there. Greg was dubious that it would be a lasting repair but otherwise they're bricks.
I have been meaning to take the exhaust cams from the Zombie out to have 1 tooth fixed on each of them, Webcams quoted $275 a cam to do it last fall but I haven't managed to get out there. Greg was dubious that it would be a lasting repair but otherwise they're bricks.
07-24-2015, 08:33 PM
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07-24-2015, 10:15 PM
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.....DLC the lifters. Cam lobes look like they've been polished, after a few miles.
Calling Rob Edwards for a picture....
Calling Rob Edwards for a picture....
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greg brown
714 879 9072
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Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
07-25-2015, 12:17 AM
#15
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...I have been meaning to take the exhaust cams from the Zombie out to have 1 tooth fixed on each of them, Webcams quoted $275 a cam to do it last fall but I haven't managed to get out there. Greg was dubious that it would be a lasting repair but otherwise they're bricks.
can webcams take care of my missing tooth GT cams ??? (the original Holbert cams?)
after seeing andersons and Fans cams with bolt on gears it made me think that something might be possible. plus there is a 944 cam guy from canada that has been doing that modification and repair for many years with no issues.
after seeing andersons and Fans cams with bolt on gears it made me think that something might be possible. plus there is a 944 cam guy from canada that has been doing that modification and repair for many years with no issues.
when they arrived damaged. They are perfect and unused, but at the moment they are nothing more than wall art. I will never throw them out ... but I will also never give up on trying to find a way to fix them.I have spoken to the best race cam guys here in Australia, and they all tell me that welding would not be a lasting or reliable repair on such a fragile projection, no matter how well it was done or heat treated. One company I spoke to (https://www.harrop.com.au/), who I've dealt with for over 40 years, and make engineering masterpieces, share GB's view.
This is also why I've shown interest in bolt on sprockets .... but the limiting factor, is that the fitment would be pointless if the profile has to be destroyed, to get the sprocket on. Ake's sprocket seems the best, with its standard tooth count, but the cam lobes have to be rebuilt ... which doesn't make sense for a tooth only repair.
Who is the 944 cam guy Mark? Link?