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Thread: Basic tune up- plug gap?

  1. #1
    Senior Member Merv's Avatar
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    Basic tune up- plug gap?

    I am planning some basic tune up work this weekend before tackling the valve adjustment after that. I have been searching around on Pelican and in the books I have for the recommended spark plug and its clearance. There is a variety of recommendations. In my original 2.0L motor now are NGK BP5ES plugs and the gap is about 1mm (!). My Haynes says that this should be 0.35mm. I do have the aftermarket MSD ignition fitted. Any suggestions please!

    merv
    Last edited by Merv; 01-16-2013 at 12:40 PM.
    Merv

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  2. #2
    Senior Member Fishcop's Avatar
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    Merv, factory spec goes out the window when MSD/Hi6 ignitions are installed. You can open gaps up to 1mm giving your self a nice fat spark.
    John Forcier
    EarlyS #1987
    1968 911 Race Car "Grun Hilda"
    1969 S/T interpretation "Blau Healer"
    Restoration Saga

  3. #3
    Senior Member Merv's Avatar
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    Yes thanks John. I eventually found that out and I went with 0.05" (1.2mm) and it runs beautifully and revs more freely now. Will check plug colour in a few days.
    Merv

    Member # 2633
    Cars:
    Porsche '68 - 911N (Sold)
    Porsche 356B (T-6) S Coupe
    Porsche 2008 C2 997 Cabriolet (Sold)
    Porsche 2010 Gen.2 Boxster S

  4. #4
    Senior Member Merv's Avatar
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    I am now wondering if the BP5ES is the best plug. Should I be using BP7ES or even the 8ES? (standard 2.0L)
    Merv

    Member # 2633
    Cars:
    Porsche '68 - 911N (Sold)
    Porsche 356B (T-6) S Coupe
    Porsche 2008 C2 997 Cabriolet (Sold)
    Porsche 2010 Gen.2 Boxster S

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