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Thread: BJ73 - Urgent Advice Needed

  1. #1
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    jehanzebnasir's Avatar
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    Question BJ73 - Urgent Advice Needed

    Dear Pakwheelers

    Nowadays I am in the process of acquiring a BJ73, but the problem is that instead of original 3B it has a 2L engine installed in it. I searched pakwheels and got this useful information for comparsion purpose. As I am a prospective newcomer to 4x4 club dont know the effect of these changes of gear ratio h/l ratio and axle ratio. Your expert advice will be highly appreciated.

    ENGINE

    Type
    Model 3B, diesel engine, OHV

    Cylinders
    in-line 4

    Bore x stroke
    102.0 x 105.0mm

    Displacement
    3.431cc

    Compression ratio
    20.0

    Maximum net power
    98PS/3,500 r.p.m.

    Maximum net torque
    23.0kg-m/2,200 r.p.m.

    Gasolin tank capacity
    90 liters

    TRANSMISSION
    5 M/T

    Gear ratio
    : 1st 4.843
    : 2nd 2.618
    : 3rd 1.516
    : 4th 1.000
    : 5th 0.845
    : reverse 4.843

    TRANSFER

    Gear ratio
    : high 1.000
    : low 1.960

    Axle ratio
    4.111

    ENGINE

    Type
    Model 2L-T, diesel engine, turbo

    Cylinders
    in-line 4

    Bore and stroke
    92.0 x 92.0mm

    Displacement
    2,446cc

    Compression ratio
    20.0

    Maximum net power
    85PS/4,000 r.p.m.

    Maximum net torque
    19.2kg-m2,400 r.p.m.

    Fuel Tank Capacity
    90 liters

    TRANSMISSION
    5 M/T

    Gear ratio
    : 1st 4.313
    : 2nd 2.330
    : 3rd 1.436
    : 4th 1.000
    : 5th 0.838
    : reverse 4.220

    TRANSFER

    Gear ratio
    : high 1.000
    : low 2.295

    Axle ratio
    4.875


  2. #2
    Senior PakWheeler Follow
    SuhaibKiani's Avatar
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    Basically there is a mismatch of the engine and the gear+diff. The 3B puts out a lot more power and torque and has longer (numerically lower) diff ratios (4.11) than the 2LT models (4.875)....

    While in 1st, 2nd and 3rd gears this will be somewhat offset by shorter (numerically lower) gear ratios, in 4th and 5th gears there will be significant difference in power & torque... ( I am too lazy today to do the maths for comparison but you can get the precise comparison if you multiply gear x diff ratios for each setup)....

    Overall you will end up with a more economical drive but the car will struggle for power in climbing and offroading situation. Assuming that the engine is a later model 2LT in good shape, its possible that the drive is still quite enjoyable on the road, highways and flat tracks. On steep climbs and offroading the engine will sit out of its comfort zone particularly at the low end. The 2LT engine will also put out a lot more black smoke than it would with its original setup (though that is also dependent on the pump/turbo settings)....

    If however the engine is worn out, you will possibly have issues as its likely that the low end is not putting out as much torque as it should and the car will struggle a lot more....
    "If YOU don't believe in what you're doing it'll never work."

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