Magnesium case for Porsche Historic Racing.

[Olsen911]

Hello Guys.

Wanted to show you what we are up to.

We are a small Racingteam in Europe, running the Historic Race Series here in Europe with Porsche 911 2.3 ST 1971.



Porsche also did race these cars with the magnesium engine cases and therefore we also have to. But this was 46 years ago.

We are always struggling finding some useable engine cases and make them stand the task. When we finally find some useable cases the pricey bit is all the machine work that goes into make them to racing engines.

And we are seeing most of these mag. cases are becoming more and more fragile and the chance of cracks in these cases after 1 or 2 season is getting more and frequently.







Something had to be done so we looked into the marked to find anyone how produced all new high quality engine cases.

Not such thing existed so we contacted the Historical Committee Europe (under FIA) to whether it was possible to reproduce a engine case and still be able to be approve and participate in the FIA races and the HTP. – Historic Technical Passport . HTP. – Historic Technical Passport are used in Europe as a “stamp” for at the car contains all the correct parts and are authentic in it´s class.

Historical Committee Europe replyed: there is a rule that states” if a part can´t be found and if the factory don´t produce or selling this part no more, A corresponding part can be produced with similar dimensions – appearance and function”

We went to work.





More to come.

Thanks - Cheers - Olsen911 - Tommy Olsen.

[Frank Beck]

Yes; 45 year old heat cycled mag is so unreliable that it makes accepting the extra 35lbs +/- of an alu case very acceptable; saving a little weight is meaningless if you don't finish.
And since alu cases are readily available why would the historical committee allow a newly manufactured case?

Fairly generic drawing. What stage is the project at?


BTW: Welding a plate over the rear webbing almost completely eliminates the possibility of cracking in that area.

[gled49]

The crack occurs at the bottom of the head studs. Ollies installs about a 2" long insert there at the back that goes down into the main web and takes the load off that part of the case. Seems to be a good preemptive mod against that defect. G

[Olivier]

Interesting thread and project!
There are already people doing engines case repops
4 cams
964
And Freisinger sell sparkling brand new 901/20 cases.

I know the work involved and here is the question. Your 3d looks to be done for billet machining? Why dont you push a little more and produce a faithfull replica cast cases? Probably way more easier to recover your investment.

Please post more about it!

[Olsen911]

Thanks guys.

Yes; 45 year old heat cycled mag is so unreliable that it makes accepting the extra 35lbs +/- of an alu case very acceptable; saving a little weight is meaningless if you don't finish.
And since alu cases are readily available why would the historical committee allow a newly manufactured case?

Fairly generic drawing. What stage is the project at?


BTW: Welding a plate over the rear webbing almost completely eliminates the possibility of cracking in that area.

Frank.

The historical committee based their decision from a previous approval they have granted permission to manufacture new engine cases for the FORD Escorts BDA - BDG.

Project stage is Drawings and production methods are in place and prototype must be prepared next.

Thanks - Tommy.

The crack occurs at the bottom of the head studs. Ollies installs about a 2" long insert there at the back that goes down into the main web and takes the load off that part of the case. Seems to be a good preemptive mod against that defect. G

GLED49: Please do post more about this solution from Ollies.?

Thanks - Tommy.

Interesting thread and project!
There are already people doing engines case repops
4 cams
964
And Freisinger sell sparkling brand new 901/20 cases.

I know the work involved and here is the question. Your 3d looks to be done for billet machining? Why dont you push a little more and produce a faithfull replica cast cases? Probably way more easier to recover your investment.

Please post more about it!

Olivier.

Please post more about the 4 cam repo case.? like to see that.

We will machine it from billet as our productions numbers will be low and we believe that the final case will be stronger than by casting.

Thanks - Cheers - Olsen911 - Tommy Olsen

[Olsen911]

This new engine case will not have any need for any additional machine work.





Thanks - Cheers - Olsen911 - Tommy Olsen

[718RSK]

Please post more about the 4 cam repo case.? like to see that.

Attached two pictures of the case I am involved in. It is based on a late style RS60 case with six through bolts. We have gone one step further and added shuffle pins and 12mm through bolts as used on the 587/3 cases. Both a roller and plain bearing version will be offered. Heads are in the works.

[NZVW]

Historical Committee Europe replyed: there is a rule that states” if a part can´t be found and if the factory don´t produce or selling this part no more, A corresponding part can be produced with similar dimensions – appearance and function”

Lets go back to reply#7

So the FIA are in agreement with the fact that Magnesium cases are no longer produced or readily available so they are HAPPY with Ali cases ??

Personally I believe you are delusional in thinking they will be accepting of a billet style 911 engine case when there are 100,000's of existing aliminium cases of the similar era and design available.

Really, ??

[sithot]

100,000? I wish so too but according to this that’s not the “case”.
http://www.early911sregistry.org/for...l=1#post401789

[Olsen911]

Thanks - Cheers - Olsen911 - Tommy Olsen.