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Thread: FS: 911 ST Preschona Oil Pressure Relief Valve

  1. 10-05-2018, 04:19 PM #1
    914-6gt
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    FS: 911 ST Preschona Oil Pressure Relief Valve


    Price: $3,500


    • 1971 PORSCHE 911 ST EARLY RACING PART
    • Porsche Part Number: 901.107.285.20
    • Fully Adjustable Opening Pressure (unlike the later 911 RSR Valve)
    • Indispensable Component of an Endurance Porsche Vintage Racing Car
    • Central to a Racing External Oil Cooling Dry-Sump Lubrication System
    • Limited production, not many made. More pictures here


    A perfect reproduction of the OEM Preschona Oil Pressure Relief Valve, many years in the making.
    This is a 'first generation' exacting copy of my "NOS" original Preschona Valve and not 'a-copy-from-a-copy' produced by anyone else.
    In order for me to reproduce this rare oil pressure relief valve, my "NOS" and "OEM" valve was used.
    Even its internal spring was made in three attempts, until it was duplicated correctly matching the 'specs' of the original coil. This valve is perfect in every way.

    914-6 GT Preschona Oil Pressure Relief Valves - Photo 00a.jpg

    20180808_145723c.jpg

    20180808_145726c.jpg

    20180808_145729c.jpg

    20180808_145732c.jpg

    20180808_145855c.jpg

    20180808_145738c.jpg

    Link to thread where these photos were borrowed...

    Early911Sregistry 911 ST Preschona Oil Pressure Relief Valve - Photo 01a.jpg

    Early911Sregistry 911 ST Preschona Oil Pressure Relief Valve - Photo 02a.jpg

    Early911Sregistry 911 ST Preschona Oil Pressure Relief Valve - Photo 03b.jpg

    Feel free to contact me with any questions. Thank you.
    Last edited by 914-6gt; 10-06-2018 at 04:44 PM.
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  2. 10-05-2018, 05:02 PM #2
    914-6gt
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    Here is a book photo of a 911R engine bay (R4).

    Difficult to see, but there is a Preschona Oil Pressure Relief valve behind some of the oil line components at the right side of the photo...

    2016 Pix - LAX Hilton Literature Show - 911R Book Photo - Photo 01a.jpg

    And the period blueprint drawing

    Preschona Oil Pressure Relief Valve - Blueprint Drawing.jpg
    Last edited by 914-6gt; 10-06-2018 at 07:12 PM.
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  3. 10-06-2018, 06:14 AM #3
    StephenAcworth
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    What’s the book???

    Please!!!
    1966 911 Coupe - Slate Grey - 304598 - still in restoration!

    Member #1616
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  4. 10-06-2018, 09:20 AM #4
    914-6gt
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    Quote Originally Posted by StephenAcworth View Post
    What’s the book???

    Please!!!
    Hello Stephen, you will have to contact Ernie Wilberg. While attending the 2018 LAX Hilton Literature/Memorabilia Show, I snapped these photos of the books Ernie displayed at his table. I'm not clear if he has plans to offer his 911R books for sale in the future.

    In the meantime...

    911R Ernie Wilberg's Book 2018 LAX Hilton Lit Show - Photo 01b.jpg

    911R Ernie Wilberg's Book 2018 LAX Hilton Lit Show - Photo 02b.jpg

    911R Ernie Wilberg's Book 2018 LAX Hilton Lit Show - Photo 03b.jpg
    Last edited by 914-6gt; 10-06-2018 at 10:56 AM.
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  5. 10-06-2018, 09:28 AM #5
    914-6gt
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    A borrowed photo from Ernie's 911R pBase site, but we still can't clearly see the 'Preschona' valve in "R4" behind the oil lines.

    Curious... Can anyone provide a better photo?

    2016 Pix - LAX Hilton Literature Show - 911R Book Photo - Photo 02b.jpg



    2016 Pix - LAX Hilton Literature Show - 911R Book Photo - Photo 02c.jpg
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  6. 10-06-2018, 04:58 PM #6
    914-6gt
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    Failed to also upload a few pics of the steel cap.

    The cap alone took hours to fabricate, hand-made on a lathe from a solid chunk of steel, no CNC used here...

    20180808_145908c.jpg

    The material tolerance held here, from top to bottom was approximately between .016 and .017

    20180808_145901c.jpg

    20180808_145904c.jpg

    Very cool piece also, if I may say so...
    Last edited by 914-6gt; 10-07-2018 at 12:35 PM.
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  7. 10-07-2018, 09:00 AM #7
    andrea70
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    Hallo Armando
    Compliment for the job: it’s PERFECT! Bravo!!!

    Here you are another “real” photo.
    A Nos preshona valve mounted on my 2.5 St engine.
    In this “exposed” configuration It’s mandatory the special oil filler with the correct attachment.

    Ciao
    Andrea70

    BD1EF70D-8144-444A-B64C-A96DC9690DAB.jpeg
    Last edited by andrea70; 10-07-2018 at 09:38 AM.
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  8. 10-07-2018, 10:14 AM #8
    andrea70
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    And this is a photo of the “hidden” version taken from the excellent and superb Ernie Wilberg’s site:

    BCE0BE39-050B-40BD-A1FE-9790AD17DAB6.jpeg

    In this picture you can see the second version of preshona valve.
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  9. 10-07-2018, 10:55 AM #9
    914-6gt
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    Thank you Andrea, I'm very satisfied with the results.

    Here you go, the 'special' racing oil filler neck you mentioned as shown in your photo.

    20080901 PORSCHE 911 ST Racing Oil Filler Neck - Photo 01d.jpg

    The tag attached to his piece was labeled "IROC" when I purchased it.

    20080901 PORSCHE 911 ST Racing Oil Filler Neck - Photo 01e.jpg

    I have not confirmed that...

    20080901 PORSCHE 911 ST Racing Oil Filler Neck - Photo 03d.jpg

    ...and I'm thinking "Early 911 ST"

    20080901 PORSCHE 911 ST Racing Oil Filler Neck - Photo 03e.jpg

    20080901 PORSCHE 911 ST Racing Oil Filler Neck - Photo 02d.jpg

    20080901 PORSCHE 911 ST Racing Oil Filler Neck - Photo 02e.jpg
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  10. 10-07-2018, 01:11 PM #10
    andrea70
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    Armando

    It’s not an IROC part , but a 911R part

    Here you are my nos filler with the correct Porsche code (typewrited as pre-1970 tags)

    E00FF048-B60C-4DA2-A141-D62BAFAA7BF7.jpg
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