Notices
928 Forum
Sponsored by:
Sponsored by: 928 Specialists

GT Cam Damage - Endless Spending

 
Old 02-01-2012, 05:02 AM
  #31  
Z
Addict
Rennlist Member
 
Z's Avatar
 
Join Date: Dec 2002
Posts: 1,051
Likes: 0
Received 0 Likes on 0 Posts
Default

Just to clarify exactly what's in the first picture of this thread, is that an exhaust cam lobe on the 5-6 cylinder bank, being looked at from the front of the engine?
Z is offline  
Old 02-01-2012, 08:23 AM
  #32  
heinrich
928 Collector
Rennlist Member

Thread Starter
 
heinrich's Avatar
 
Join Date: Jan 2003
Location: Seattle
Posts: 17,263
Likes: 0
Received 0 Likes on 0 Posts
Default

Z, correct. Those pix are 5 and 6 second exhaust lobe.

From what I can see without turning the engine more:

3, 5, 6, 7, 8 all have damage to the second exhaust lobe (and lifter), and some of those show damage to both exhaust lobes and lifter,

All damage is on the trailing edge of the lobes, except perhaps 6, which seems to be pretty much on the peak.
heinrich is offline  
Old 02-01-2012, 08:51 AM
  #33  
heinrich
928 Collector
Rennlist Member

Thread Starter
 
heinrich's Avatar
 
Join Date: Jan 2003
Location: Seattle
Posts: 17,263
Likes: 0
Received 0 Likes on 0 Posts
Default

How usable would these be? They are not the GT cams. They appear to have no damage, but there are feint discolorisations across the bearing surfaces, maybe wear? These cams are dry. The apexes appear to be in excellent health. I don't know cams well... thoughts from cam experts?
Attached Images     
heinrich is offline  
Old 02-01-2012, 10:46 AM
  #34  
Cosmo Kramer
Addict
Rennlist Member
 
Cosmo Kramer's Avatar
 
Join Date: Jan 2009
Location: On boost
Posts: 4,278
Likes: 0
Received 3 Likes on 3 Posts
Default

I am no expert, but I would say they look OK. Looks like the journal is just polished from the bearing. I would double check by measuring them. Lobes look good.
Cosmo Kramer is offline  
Old 02-01-2012, 11:47 AM
  #35  
928er
Addict
Rennlist Member
 
Join Date: Jul 2001
Posts: 611
Likes: 0
Received 0 Likes on 0 Posts
Default

you could do a base circle grind on the s4 cams and have a better profile than the GT... it would be worth thinking about.
928er is offline  
Old 02-01-2012, 11:52 AM
  #36  
IcemanG17
Super User
 
IcemanG17's Avatar
 
Join Date: Sep 2004
Location: Stockton, CA
Posts: 15,996
Likes: 0
Received 0 Likes on 0 Posts
Default

H
I have a set of S4 cams you can have for free...........granted its not ideal, but free is free

Did you check the rod bearings when you installed the pan? With that much metal missing, some of it must have gone through the bearings....
IcemanG17 is offline  
Old 02-01-2012, 12:45 PM
  #37  
heinrich
928 Collector
Rennlist Member

Thread Starter
 
heinrich's Avatar
 
Join Date: Jan 2003
Location: Seattle
Posts: 17,263
Likes: 0
Received 0 Likes on 0 Posts
Default

Sterling, thanks ... didn't know that. Brian, thanks, I may need those
heinrich is offline  
Old 02-01-2012, 12:49 PM
  #38  
heinrich
928 Collector
Rennlist Member

Thread Starter
 
heinrich's Avatar
 
Join Date: Jan 2003
Location: Seattle
Posts: 17,263
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by andy-gts View Post
arghh!!!!!! I wish I could help some how. . I have a set of gts cams you could have but that wouldnt do too much. My gts engine is arriving from gregs shop friday and it has gts cams with base circle grind that with 5 psi gave me 426 rwhp on mustang dyno. I could get those off the heads if you wanted( they were dr nicks)

just thinking .

andy
Andy, looking at specs, this may actually be a very good option for me. GTS lift is at least better than S4, though I know the exhaust cams are supposedly not good at all, more than just lift. Do you know how much lift your cams offer?

I think I should take you up on this very generous offer thank you
heinrich is offline  
Old 02-01-2012, 01:54 PM
  #39  
dcrasta
User
 
dcrasta's Avatar
 
Join Date: Feb 2009
Location: Washington "Dc"
Posts: 1,810
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Randy V View Post
That's not good. Using 5W40 sure didn't help.

Sorry, H.
This is what I was thinking. Changing Oil once a year? Even if you don't drive oil breaks down from contact with air. Things evaporate. Not good.
dcrasta is offline  
Old 02-01-2012, 02:15 PM
  #40  
karl ruiter
Addict
Rennlist Member
 
Join Date: Jan 2003
Location: Honolulu and sometimes L.A.
Posts: 2,669
Likes: 0
Received 0 Likes on 0 Posts
Default

Not sure what I am missing r.e. rod bearings. Oil from the heads goes back down to the pan and from there to the pickup, oil pump, and oil filter before going out the the bearings. I would think the oil filter would remove any metal residue that did not just sink to the bottom of the pan.

Unless the concern is just that the oil used was not up to the task and thus the rod bearing are suspect. But it seems that this is more of a GT cam issue and less of an oil issue.

Not to say inspecting the rod bearings would be a bad idea if the motor is out on a stand. You would not have to replace them if they look good, so you would only be out the nuts for sure.
karl ruiter is offline  
Old 02-01-2012, 05:55 PM
  #41  
Randy V
Addict
Rennlist Member
 
Randy V's Avatar
 
Join Date: Jun 2000
Location: Insane Diego, California
Posts: 40,147
Likes: 0
Received 5 Likes on 4 Posts
Default

Have you requested a refund from the seller?
Randy V is offline  
Old 02-01-2012, 06:00 PM
  #42  
IcemanG17
Super User
 
IcemanG17's Avatar
 
Join Date: Sep 2004
Location: Stockton, CA
Posts: 15,996
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Randy V View Post
Have you requested a refund from the seller?
This really isn't a bad idea.....you did pay TOP DOLLAR for this motor, since it was advertised as excellent..... I would discuss it with Larry.....
IcemanG17 is offline  
Old 02-01-2012, 07:26 PM
  #43  
heinrich
928 Collector
Rennlist Member

Thread Starter
 
heinrich's Avatar
 
Join Date: Jan 2003
Location: Seattle
Posts: 17,263
Likes: 0
Received 0 Likes on 0 Posts
Default

Randy, Brian ..... I did call him when I found the damage, and did request that he do right by me. He said he would think about it.
heinrich is offline  
Old 02-01-2012, 07:46 PM
  #44  
86'928S MeteorGrey
User
 
86'928S MeteorGrey's Avatar
 
Join Date: Jun 2008
Location: Surprise, Arizona
Posts: 1,914
Likes: 0
Received 0 Likes on 0 Posts
Default

Can a set of 86.5 cams be modified to work? They might be easier to come by...
86'928S MeteorGrey is offline  
Old 02-01-2012, 09:21 PM
  #45  
Randy V
Addict
Rennlist Member
 
Randy V's Avatar
 
Join Date: Jun 2000
Location: Insane Diego, California
Posts: 40,147
Likes: 0
Received 5 Likes on 4 Posts
Default

Originally Posted by heinrich View Post
Randy, Brian ..... I did call him when I found the damage, and did request that he do right by me. He said he would think about it.
That doesn't sound promising.

Dude is looking at a Douche of the Year Award if he doesn't step up.
Randy V is offline  

Thread Tools
Search this Thread
Quick Reply: GT Cam Damage - Endless Spending


Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: