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Thread: Spark plug

  1. 05-10-2021, 09:07 AM #1
    71-911T
    71-911T is offline
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    Spark plug

    What would the better spark plug for my stock 71-911T.I bought some Bosch w250 P21'S from Esoterik,brand new NOS.I also have Bosch W6DC'S made in Germany.Let me know your thoughts.

    Thanks inadvance

    David
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  2. 05-12-2021, 01:52 AM #2
    fizeus
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    you can use BOSCH W5DC ( according to PET) or the resistor type if you can't find it (it's labeled WR5DC).
    a good alternative can be NGK BPR7EIX.
    avoid using any platunum spark plug.

    what plug are you using now? do they look fouled? post a pic if you want.
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  3. 05-12-2021, 11:01 AM #3
    lkadams
    lkadams is offline
    912->911 conversion
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    The Bosch W5DC is the colder plug (for higher compression engines like 911S). W6DC is hotter for lower compression (911T). So with Bosch, as the number goes up, the plug gets hotter.

    NGK heat ranges are backwards from Bosch - NGK 7 = Bosch 5, and NKG 5 = Bosch 8.

    All the plugs available now seem to be the resistor type. May not be ideal for CDI systems based on some opinions?
    Keith Adams
    Calgary, Alberta, Canada
    Early 911S Registry #906 | PCA member IG: @912R
    1969 Blutorange 912R - 912 to 911 conversion
    1969 Mercedes 280 SE (W111) Coupe
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