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Thread: COMPRESSION QUESTION ???

  1. 8th April 2004, 04:07 PM #1
    GWH Guest

    COMPRESSION QUESTION ???

    there are two compression set ups for 2.25l Series 3 '76 Landrover.

    a 7-1 compression ration & an 8-1 compression ratio.
    each has a preferred spark plug gap but will operate using the wrong gap just not as good.

    How do I tell what the compression ratio is, if I perhaps... er ... maybe had been so dumb as to throw out the spark plugs that were in it before considering such things?


    chris
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  2. 9th April 2004, 11:07 AM #2
    LRHybrid100's Avatar
    LRHybrid100
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    try the below link to calc your Compression Ratio:

    http://www.bgsoflex.com/cr.html

    Need quite a few parameters to accurately work it out
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  3. 9th April 2004, 06:05 PM #3
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    G'day Chris and welcome from ausfish.
    cheers
    Mick
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  4. 9th April 2004, 06:08 PM #4
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    Yours would be the three bearing engine. Im having a look round for that manual but in the process of moving so everythings a big mess. If your desperate in the mean time theres a place at Archerfield called FWD motors. They specialise in series landies and there just off the ipswich motorway (underpass off lilian avenue and turn right). There a great mob and will have the right part if you pop down there and tell em your engine number.
    cheers
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  5. 9th April 2004, 06:46 PM #5
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    BTW Chris the series three manual is in PDF format in the downloads section.
    cheers
    Mick
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  6. 10th April 2004, 02:06 PM #6
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    2.25 compression ratio

    Hi BTW Chris [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]
    The 3 bearing 2.25 motor as fitted to Australian produced Series Landies was a 7:1 comp head and were fitted with Champion N8 Engine Timed at 6 degrees BEFORE top dead centre if pre anti-polution or if anti -polution gear is removed,

    Imported Vehicles, (Station Wagons and some Specials) were fitted with 8:1 compression heads ( this is picked by an "8" stamped into a flat on the manifold side of the head inline with the carb. NO "8" then its 7:1 or a shaved 7:1 8:1 == N12Y Champion

    I run NGK-B6 ES in my 68 2a with a shaved head and have no overheating or plug burn problems. [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]
    Cheers Rocket
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  7. 12th April 2004, 03:09 PM #7
    GWH Guest
    thankyou very much guys,

    chris
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  8. 12th April 2004, 04:47 PM #8
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    btw

    the "8" stamped into the machined flat on the center of the top on the manifold side of the head is usally about 12mm {half-inch) high and is not always clearly visible.

    many times you only get to see "0" or"o"
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