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Thread: Never Seen These Before

  1. 04-15-2018, 11:03 AM #1
    Haasman
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    Never Seen These Before

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    I was told these were used on twin plug heads, where the owner for some reason decided to run with only one plug. Go figure.<script type="text/javascript" src="safari-extension://com.ebay.safari.myebaymanager-QYHMMGCMJR/5df9a8c/background/helpers/prefilterHelper.js"></script><script type="text/javascript" src="safari-extension://com.ebay.safari.myebaymanager-QYHMMGCMJR/5df9a8c/background/helpers/prefilterHelper.js"></script>
    Haasman

    Registry #2489
    R Gruppe #722
    65 911 #302580
    70 914-6 #9140431874
    73 911s #9113300709
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  2. 04-15-2018, 01:49 PM #2
    ejboyd5
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    Turn it clockwise one flat so we can see the part number of this beauty.
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  3. 04-15-2018, 02:30 PM #3
    Haasman
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    Not at the location. I will see if I can get a part number.<script type="text/javascript" src="safari-extension://com.ebay.safari.myebaymanager-QYHMMGCMJR/5df9a8c/background/helpers/prefilterHelper.js"></script><script type="text/javascript" src="safari-extension://com.ebay.safari.myebaymanager-QYHMMGCMJR/5df9a8c/background/helpers/prefilterHelper.js"></script>
    Haasman

    Registry #2489
    R Gruppe #722
    65 911 #302580
    70 914-6 #9140431874
    73 911s #9113300709
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  4. 04-15-2018, 03:53 PM #4
    edmayo
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    Why couldn't he have just screwed in an old spark plug ???? A bit OCD !
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  5. 04-15-2018, 04:23 PM #5
    davep
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    Saving a tiny amount of compression?
    Porsche Historian, contact for Kardex & CoA-type Reports
    Addicted since 1975, ESR mbr# 2200 to 2024 03
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  6. 04-15-2018, 05:41 PM #6
    Herman F Lausberg
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    B Production Porsches were not allowed to run twin plug motors in SCCA or Trans Am in the late 70's while IMSA cars could run twin plug motors. I had a friend that ran in both Trans Am and IMSA with the same motor pulling the twin plug distributor for Trans Am and using a regular distributor with welded up plugs on the bottom.
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  7. 04-18-2018, 08:40 AM #7
    NeunElf
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    Quote Originally Posted by edmayo View Post
    Why couldn't he have just screwed in an old spark plug ???? A bit OCD !
    Is it possible an unused spark plug (even an ultra-cold one) might act like a glow plug and cause pre-ignition? Could carbon (or whatever) build up on a non-firing plug and make that worse?
    Jim Alton
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    1958 Porsche 356A cabriolet
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  8. 04-18-2018, 08:48 AM #8
    Frank Beck
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    Quote Originally Posted by davep View Post
    Saving a tiny amount of compression?
    +++
    Yahtzee.
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  9. 04-18-2018, 08:50 AM #9
    Xavier PJB
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    Quote Originally Posted by NeunElf View Post
    Is it possible an unused spark plug (even an ultra-cold one) might act like a glow plug and cause pre-ignition? Could carbon (or whatever) build up on a non-firing plug and make that worse?
    Now am lost.
    O-G 26 - Early911S 2407
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