2.7 case guru

[930cabman]

Most or at least many of us know the short comings of the 911 head stud issue, I recently have found the crankshaft bores in our 2.7 magnesium cases do not return to round/aligned condition after disassembly. Add this to the head stud (overbored and no material left for good anchorage) issue, and it adds up to a mess. I would like to believe someone out there has the ability to get these cases in serviceable condition for reasonable $$.

thanks

[tocobill]

Sounds like a line bore is in order. I have used Peter for casework before. He machined my case for 993RS spigot quad rings.

Peter Dawe is up in the North East PA.
Engines - Dawes Motorsports - Porsche Race Engine Builders

These were a quick search on google for North East Shops.

Bill Pfister
Eurotech Advanced Automotive
14 Grant Street
Framingham, MA 01701
508.879.9911
pfisterbuilt@msn.com
Eurotech Advanced Automotive

Jerry Pellegrino
European Performance Engineering, Inc.
165 West Central Street
Natick, MA 01760
508.651.1316
EPE Home

Chris Musante
Musante Motorsports
1257 John Fitch Boulevard
South Windsor, CT 06074
860 291 9415 FAX: 860 291 9416
chris@musantemotorsports.com
Porsche Service CT - Porsche Repair & Service by Musante Motorsports

[930cabman]

Thanks Bill

[Henry Schmidt]

Originally Posted by 930cabman

Most or at least many of us know the short comings of the 911 head stud issue, I recently have found the crankshaft bores in our 2.7 magnesium cases do not return to round/aligned condition after disassembly. Add this to the head stud (overbored and no material left for good anchorage) issue, and it adds up to a mess. I would like to believe someone out there has the ability to get these cases in serviceable condition for reasonable $$.

thanks

I appreciate your concern for $$ but unless there is a matching numbers issue, at times the best move is to seek a replacement case.
Some of the extreme measures to "save" 2.7 cases a money's poorly spent.

With 8 main bearings in the 911 case, "perfect" main bores become less important. Keep in mind that after a couple of heat cycles the main webs in a mag case engine are no longer round.

Upgraded oil pump to ensure oil pressure at idle, cam feed restricters and quality bearings will make up for a slightly oval main saddle.

[930cabman]

Originally Posted by Henry Schmidt

I appreciate your concern for $$ but unless there is a matching numbers issue, at times the best move is to seek a replacement case.
Some of the extreme measures to "save" 2.7 cases a money's poorly spent.

With 8 main bearings in the 911 case, "perfect" main bores become less important. Keep in mind that after a couple of heat cycles the main webs in a mag case engine are no longer round.

Upgraded oil pump to ensure oil pressure at idle, cam feed restricters and quality bearings will make up for a slightly oval main saddle.

My sense is telling me the same thing. The 2.7 we are attempting to build is being shoe horned into a 914 conversion so the numbers have no meaning. My gut is telling me to find an aluminum case and start over. The minuses of magnesium versus the pluses of aluminum are becoming more apparent.

[Left_coast*9]

Henry you should probably disclose that you have new cases for sale. It seems to me that makes you more inclined to recommend a new case. FYI to the OP

[930cabman]

Originally Posted by Left_coast*9

Henry you should probably disclose that you have new cases for sale. It seems to me that makes you more inclined to recommend a new case. FYI to the OP

Yes, I am aware of the availability of new aluminum engine cases, but $$$$ is a minor factor

[Black 993]

Originally Posted by Left_coast*9

Henry you should probably disclose that you have new cases for sale. It seems to me that makes you more inclined to recommend a new case. FYI to the OP

Henry is selling new 2.7 mag cases? News to me. Can you post a link?

[Henry Schmidt]

Originally Posted by Henry Schmidt

I appreciate your concern for $$ but unless there is a matching numbers issue, at times the best move is to seek a replacement case.
Some of the extreme measures to "save" 2.7 cases are money's poorly spent.
This is just advise to think before you leap
With 8 main bearings in the 911 case, "perfect" main bores become less important. Keep in mind that after a couple of heat cycles the main webs in a mag case engine are no longer round.
This tells the OP that "perfect" is an elusive standard

Upgraded oil pump to ensure oil pressure at idle, cam feed restricters and quality bearings will make up for a slightly oval main saddle.
These are ways to mitigate the symptoms of slightly imperfect main bores

Originally Posted by Left_coast*9

Henry you should probably disclose that you have new cases for sale. It seems to me that makes you more inclined to recommend a new case. FYI to the OP

Did you actually read what I wrote?
I post here to help DYI builder and these "nefarious intent" posts gets pretty fricking tedious.

[Henry Schmidt]

Originally Posted by Left_coast*9

Henry you should probably disclose that you have new cases for sale. It seems to me that makes you more inclined to recommend a new case. FYI to the OP

That's silly. Where does this noise come from.
I don't have new mag cases for sale but even if I did, I never premise my advice based on sales.

To be clear, I actually have almost a hundred 911 cases on the shelf and have never once let that influence my advice.

My advice is based on experience with mag cases. I've chased cases to the point of throwing thousands of dollars away. At some point you have to realize, that if you try to make candy out of shyt, you end up with shyt candy.

[gsxrken]

Originally Posted by Left_coast*9

Henry you should probably disclose that you have new cases for sale. It seems to me that makes you more inclined to recommend a new case. FYI to the OP

That’s a really poor reading comprehension job on your part. A guy that has built probably 400 Porsche engines basically told the OP not to worry about it if he takes a few reasonable steps.

I’m not trying to flame you, I just don’t want one of the more experienced engine builders in the hobby to throw in the towel on this board over this and the head stud nonsense. I’m just here to learn.

[930cabman]

@Henry, my gut is telling me the same. I am not a seasoned engine builder, but know a thing or two. The engineers in Stuggart 50+ years ago produced many great designs, but they were human and did not have a 100% success rate. The magnesium engine case appears to be one. When the base metal has inherent deficiencies when compared to aluminum, the result can often be candy shyt.

We are building a 914/6 conversion and had a 2.7 short block laying around collecting dust. A previous mechanic had installed a thread insert product which has since failed leaving little room for machining. I might be interested in a 3.0 aluminum case if you are willing to part wit a decent one.
Thank you

[Henry Schmidt]

Originally Posted by 930cabman

@Henry, my gut is telling me the same. I am not a seasoned engine builder, but know a thing or two. The engineers in Stuggart 50+ years ago produced many great designs, but they were human and did not have a 100% success rate. The magnesium engine case appears to be one. When the base metal has inherent deficiencies when compared to aluminum, the result can often be candy shyt.

We are building a 914/6 conversion and had a 2.7 short block laying around collecting dust. A previous mechanic had installed a thread insert product which has since failed leaving little room for machining. I might be interested in a 3.0 aluminum case if you are willing to part wit a decent one.
Thank you

We can probably dig through the pile and come up with something.
You do know that virtually nothing from the 2.7 will transfer to a 3.0 SC case.
The Euro Carrera case could accept the 2.7 crank but they are very rare.
I would think you would be better off looking for a 3.0/3.2 core.
A usable 2.7 case will make your life easier, but they all have some issues. If you do go searching for a 2.7 case, look for a 73 7R or a 74 2.7. Heat is what kills the mag cases. 73 7R case and 74 2.7 missed the thermal reactor nightmare so they are the one to seek.
The 73 7R case will need the spigots bored to fit 2.7 but that's easy.