magnesium case head studs
Thread Starter
Track Day
Joined: Feb 2013
Posts: 19
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From: USA
magnesium case head studs
My son is rebuilding a 74 911 engine and is looking for somebody who can install head stud inserts. ("Time Serts" or "case savers"). Original studs have not pulled out, but he wants to do a job that is reliable. Case is disassembled, clean and ready to ship. (He lives in north east Montana).
Any suggestions on a shop that is experienced in this particular job? Also, what should my son expect as far as machine work costs for this operation? A friend of my son said he heard of a semi retired Porsche machinist in Idaho. No name or location known for this person if the story is true.
Any help on this would be appreciated.
Jack
Any suggestions on a shop that is experienced in this particular job? Also, what should my son expect as far as machine work costs for this operation? A friend of my son said he heard of a semi retired Porsche machinist in Idaho. No name or location known for this person if the story is true.
Any help on this would be appreciated.
Jack
Rennlist Member
Joined: Mar 2012
Posts: 17,250
Likes: 2,219
From: SoCal
are you sure the case is straight, doesn't need to be line bored, aligned, etc?
I just got a case back from Ollies machine shop. 3mo lead time. LOT of work on a mag case.
Another is competition engineering
You really, since you are going through the efforts, want to have a qualified machine shop evaluate the case and do the work it needs. There is some work you won't do unless you are hot rodding the car (like shuffle pins).
https://rennlist.com/forums/911-foru...l#post16544504
You can see post 421, etc.
I just got a case back from Ollies machine shop. 3mo lead time. LOT of work on a mag case.
Another is competition engineering
You really, since you are going through the efforts, want to have a qualified machine shop evaluate the case and do the work it needs. There is some work you won't do unless you are hot rodding the car (like shuffle pins).
https://rennlist.com/forums/911-foru...l#post16544504
You can see post 421, etc.
Drifting
Joined: Nov 2014
Posts: 2,172
Likes: 215
From: Orange County, CA & Tucson, AZ
^spyerx is correct. The Mag cases generally will need a lot of work. Mine is with Ollies (been there since end of December). They let me know a few weeks ago that it needs an align bore. When I dropped it off, they were pretty clear that they pretty much all do. The mains wear in an oblong shape and once you separate the case and 'relax' the magnesium, you cannot reassemble it without the crank, etc binding. I think the average machining costs for these cases is $2k-$3k for cleaning, exam, align bore, time certs/studs. This link will allow you to get a sense of the potential work and associated costs http://www.olliesmachine.com/uploads...March_2019.pdf
Call Ollies to talk to them - they are great guys
Call Ollies to talk to them - they are great guys
Thread Starter
Track Day
Joined: Feb 2013
Posts: 19
Likes: 0
From: USA
^spyerx is correct. The Mag cases generally will need a lot of work. Mine is with Ollies (been there since end of December). They let me know a few weeks ago that it needs an align bore. When I dropped it off, they were pretty clear that they pretty much all do. The mains wear in an oblong shape and once you separate the case and 'relax' the magnesium, you cannot reassemble it without the crank, etc binding. I think the average machining costs for these cases is $2k-$3k for cleaning, exam, align bore, time certs/studs. This link will allow you to get a sense of the potential work and associated costs http://www.olliesmachine.com/uploads...March_2019.pdf
Call Ollies to talk to them - they are great guys
Call Ollies to talk to them - they are great guys
Thank you and spyerx for the informational help. My son located the man in Idaho who is a Porsche machinist and does work for some major players in the US and other countries. My son (engineer for an aerospace design & machining company) is trying to get a day setup to meet with the machinist soon. We will see what transpires.
Jack
Rennlist Member
Joined: Mar 2012
Posts: 17,250
Likes: 2,219
From: SoCal
Good. Just have him ensure he's familiar with the processes needed for the Magnesium case motors. The 'typical' process is: replace all studs with inserts and studs, line bore case, align anything that needs to be aligned.
The link that myflat6 linked to is pretty helpful on the long list of things they can do. Ollies is very good about getting your case, measuring it out, understanding what you need/want to do with it, and them making recommendations on what is needed (vs not).
The link that myflat6 linked to is pretty helpful on the long list of things they can do. Ollies is very good about getting your case, measuring it out, understanding what you need/want to do with it, and them making recommendations on what is needed (vs not).
Thread Starter
Track Day
Joined: Feb 2013
Posts: 19
Likes: 0
From: USA
Good. Just have him ensure he's familiar with the processes needed for the Magnesium case motors. The 'typical' process is: replace all studs with inserts and studs, line bore case, align anything that needs to be aligned.
The link that myflat6 linked to is pretty helpful on the long list of things they can do. Ollies is very good about getting your case, measuring it out, understanding what you need/want to do with it, and them making recommendations on what is needed (vs not).
The link that myflat6 linked to is pretty helpful on the long list of things they can do. Ollies is very good about getting your case, measuring it out, understanding what you need/want to do with it, and them making recommendations on what is needed (vs not).
We checked out the shop. Very, very impressive indeed. This gentleman's credentials are beyond what anyone would be expecting. Yes, he knows Porsche's well and has a world wide reputation and clientele. Spotless shop.
We were told we could only take pictures of a few items in the office. Many cloth covers were hiding things in the main machine area. All sorts of special jigs and fixtures visible. One was a 911 case fixture that was quite unique indeed.
I took some pictures of drawings (CAD) on one wall of the office. He has a seat in SolidWorks and Fusion 360, and some other design and engine performance software.
I am running short on time but will post some pictures later. The machinist strongly advised my son and I to please keep him anonymous. He relocated to the boondocks to get away from the rat race.
Jack
