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Thread: 3 v 5 bearing 2.25 diesel power ?

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    Default 3 v 5 bearing 2.25 diesel power ?

    I've read somewhere (I think on this forum) that there is only 5 bhp difference between the 5 bearing 2.25 and the 2.5.
    That would mean the 5 bearing 2.25 is more powerful than the 3 bearing 2.25.
    I always thought they were basially identical other then the crank bearings so am confused.
    Anyone confirm, or dispute, if the 5 bearing is more powerful than the 3 bearing 2.25 diesel ?

    Thanks.

    Paul Humphries.

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    Default Re: 3 v 5 bearing 2.25 diesel power ?

    3 & 5 brg 2.25 engines have the same power & torque, its just a slightly more rugged bottom end that the 5 bearings give.

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    Default Re: 3 v 5 bearing 2.25 diesel power ?

    But IIRC the 5mb does not always come with a forged crankshaft and that must help with ruggedness.

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    Default Re: 3 v 5 bearing 2.25 diesel power ?

    10Js have 59BHP and 100'lb torque, regardless of the crankshaft type. 12Js have 67 BHP and 114'lb, ie an extra 8 BHP and 14'lb. All 12Js have the far stronger 5mb crankshaft and block.

    According to the Haynes books, there is a significant difference in output between the 3mb and 5mb 8:1cr 2.25 petrol engines, and their figures suggest the 2.25 5mb is more powerful than the 2.5 petrol. I suspect it's just a misprint, though.

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    Default Re: 3 v 5 bearing 2.25 diesel power ?

    We can only assume the Later Haynes Diesel Book 3017 ( a later version) has it correct ?

    10J engine 44KW (59BHP) @ 4000 rpm

    12J engine 50KW (67 BHP) @ 4000 rpm
    ------------------------
    Land Rover Repair Operation Manual for Defender 93/95 model year
    Publication LDAWMEN93

    states 2.5 Litre Diesel Engine N.A. (and this will be the 12J 90/110 2495cc)
    50 KW @ 4000 rpm (max. torque 155 Nm @ 1800 rpm)
    ------------------------
    Regarding crankshafts there were both cast and forged crankshafts (forged crankshafts only supplied for spares).
    You need to study what Land Rover have published on this matter. And of course you can have a petrol 5 mb with either a forged or cast crank.
    Forged will always be stronger - so you need to check out your 12J because some are stronger than others in the crank department.

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