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Thread: Magnesium case for Porsche Historic Racing.

  1. #1

    Magnesium case for Porsche Historic Racing.

    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.

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    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.

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    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.

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    More to come.

    Thanks - Cheers - Olsen911 - Tommy Olsen.

  2. #2
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    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.
    Last edited by Frank Beck; 10-24-2018 at 02:56 AM.

  3. #3
    Member #226 R Gruppe Life Member #147
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    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

  4. #4
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    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!

  5. #5

    Magnesium case for Porsche Historic Racing.

    Thanks guys.


    Quote Originally Posted by Frank Beck View Post
    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.

    Quote Originally Posted by gled49 View Post
    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.

    Quote Originally Posted by Olivier View Post
    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

  6. #6
    This new engine case will not have any need for any additional machine work.

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    Thanks - Cheers - Olsen911 - Tommy Olsen

  7. #7
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    Tommy,

    Again, why are you not using early alu cases?

  8. #8
    Do you have any photos of the strengthening of the mag case,by welding a plate in etc
    I am just building a 901/20 spec engine for a 904 project,the case i have is a later 7r 2.0ltr from a sporto,for the very reason of more braceing and ribs etc, its had no grief and in great condition,but it will get grief when completed and used.
    So may be a good idea to brace at the stage i am at.
    Thanks

  9. #9
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    Quote Originally Posted by Yellow491 View Post
    the case i have is a later 7r 2.0ltr from a sporto
    7R 2.0?
    How about posting pics. With internal code please.

    I doubt I even have one of those strengthened mag cases any more. I refuse to use mag; been ambushed too many times.
    We put 50+ hours a season on our race motors and have enough challenges without worrying about cracks.

    Mag is for street cars and occasional track cars. Certainly not a race car that sees ongoing, grueling duty.

  10. #10
    I'm havng my 07 2.0 built at the moment with S cams and B&Ps , this is a sporto engine , aluminium October 67 build car
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    Last edited by woznot; 11-01-2018 at 03:40 AM.

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