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Thread: RS engine case stamp

  1. 12-18-2005, 08:27 AM #1
    210bhp
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    RS engine case stamp

    On each side of my RS silumin case, just above each case part number stamp, there is the stamp of a letter 'H' inside a circle. Does anyone know what this signifies?
    Regards
    Mike
    RS#1551(sold)
    67S
    73E (home after 25 years) and sold again
    Early S reg. #681
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  2. 12-18-2005, 08:59 AM #2
    schmidt
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    Manufacture
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  3. 12-18-2005, 09:11 AM #3
    210bhp
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    Jeff
    I was hoping you would reply, so thanks for your help. Do you know the name of the manufacturer of these cases? Where were they located. I take it was is Germany(?) and maybe they are still in business?
    Regards
    Mike
    RS#1551(sold)
    67S
    73E (home after 25 years) and sold again
    Early S reg. #681
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  4. 12-18-2005, 01:25 PM #4
    schmidt
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    Actually I am almost sure, send me a photo of it, I have a book of German manufactures identified by symbols. Here is my email

    Jeffreysmithpdx@comcast.net
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  5. 12-18-2005, 04:30 PM #5
    klaucke
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    So Porsche wasn't making the engine cases, but buying them from another manufacturer?
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  6. 12-18-2005, 05:49 PM #6
    Rick Cabell
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    Correct. Most of their engine parts are made by another company to Porsche specs.
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  7. 12-19-2005, 11:32 AM #7
    larwik
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    Is this the "H" in question?...

    ...does anybody also know what the hand stamped- "K2" beside the casting number (on my case) means?..Thank's.../ Lars...
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    Lars Wikblad...

    Early 911 "S" Registry # 527
    "R" Gruppe # 314
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  8. 12-19-2005, 03:16 PM #8
    210bhp
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    Lars
    Yup, thats it for sure. Tried taking a picture of mine but it is really difficult with the engine still in the car.
    So, what do you think....who is the manufacturer?
    Regards
    Mike
    RS#1551(sold)
    67S
    73E (home after 25 years) and sold again
    Early S reg. #681
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  9. 12-19-2005, 07:35 PM #9
    glaverbel911
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    With the into of the pressure cast Mag case, Porsche was producing there own and included in house machining. The parts marked with circle "H" i believe was the company "HIRTH". I'll double check.

    Robert Gross.
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  10. 12-19-2005, 08:57 PM #10
    glaverbel911
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    Sorry,,, my mistake... the pressure cast mag and Siliumin case's were produced by Mahle... Hope this answer's your curiousity..

    Regards, Robert Gross.
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