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Thread: Spark plug Gap HP 179

  1. 22nd August 2016, 08:03 PM #1
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    Dark61
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    Spark plug Gap HP 179

    Can anyone advise please what the spark plug gap should be on the HP 179? Having trouble finding much in detail about this.
    cheers,
    D
    1957 88 Petrol (Chumlee)
    1960 88 Petrol (Darwin)
    1975 88 Diesel (Mutley)
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  2. 22nd August 2016, 09:40 PM #2
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    67hardtop
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    The plug gap all depends on the type of ignition system have. If u have original points and standard coil then the gap should be from memory 28th or 32th. If u have a gt40 or gt40r coil then 34th. If u have an hei ignition system, fitted out of a commy blue black motor, then 40th. from memory, possibly even 60th. If u have aftermarket electronic ignition then usually 36th. To 40th.

    Dont take it as gospel but im sure that those are the correct measurements just from my fading memory.

    Cheers Rod

    Im sure if im wrong there are others out there that will set u right.😆
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  3. 23rd August 2016, 05:43 AM #3
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    Dark61
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    Thanks Rod. THe Holdens all new to me. I'll take a look at the coil etc.
    Cheers,
    D
    1957 88 Petrol (Chumlee)
    1960 88 Petrol (Darwin)
    1975 88 Diesel (Mutley)
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  4. 1st September 2016, 09:43 AM #4
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    mick88
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    As a rule of thumb I usually just doubled the points gap on the plugs. I have a Holden manual in the shed so I will check it for you.


    Cheers, Mick.
    1974 S3 88 Holden 186.
    1971 S2A 88
    1971 S2A 109 6 cyl. tray back.
    1964 S2A 88 "Starfire Four" engine!
    1972 S3 88 x 2
    1959 S2 88 ARN 111-014
    1959 S2 88 ARN 111-556
    1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
    REMLR 88
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  5. 1st September 2016, 09:58 AM #5
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    Dark61
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    I'm surprised there's so little specific stuff on the net - plenty for Land Rovers - can only find historic / general stuff for the Holden's.
    cheers,
    D
    1957 88 Petrol (Chumlee)
    1960 88 Petrol (Darwin)
    1975 88 Diesel (Mutley)
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  6. 1st September 2016, 08:34 PM #6
    Davehoos Guest
    Didn't post before as it was covered basically by .67hardtop.


    It is hard to find info on what should be a common vehicle.
    I think you find it is why conversions often get rubbished as they are tuned for the application. Also Something new mechanics don't learn at TAFE.


    BASIC IGNITION with you go for 0.8 mm.
    Better coil 1.0mm-1.1mm.
    high energy 1.5mm.


    my memory was 8-12K volts basic-
    25-40 K for a good electronic
    40+V for high energy.


    Put it on a scope and watch the spark pattern and adjust the gap to suit. adjusting the length of leads and what they are made of to get a balanced voltage


    I can remember using a coloured spark plug to work out the heat range-then you have the fact that its in a landrover that you have to work out its operating temp, load V speed and choose a plug to suit. lean mixture needing a bigger gap and cooler plug.


    last is how modified the head is cam and exhaust.-12 port etc. extractors.
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