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Thread: 80 inch weights

  1. 7th January 2015, 06:57 AM #1
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    80 inch weights

    Would someone have the front / rear axle loads for an 80 inch Series 1.

    From what I can make out the vehicle tare weight (unladen weight) is 1.3 ton with a gross weight ( laden weight) of 1.8 ton - near enough.


    This varies a bit the 51 to 53 owners manual says 1182kgs tare and 1829 gross (with all fluids eg water, oils ..)

    I have 4 80 inch vehicles with info on the guards / door. These are:

    1.30 / 1.80 ton
    tare 1.22
    tare 1 ton, 2cwt, 3qwts
    1.3

    In the past, the first thing the spring man has asked for this info. I am guessing it is more than 60 / 40 front to back?





    Erich
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  2. 7th January 2015, 08:06 PM #2
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    Hi Erich

    Which model do you want? I have TP138/B from November 1951 so can give you all the weights up to the 1951 wide spring model.

    The following is from the composite Series 1 workshop manual (but probably gives you the same info)




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  3. 7th January 2015, 10:16 PM #3
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    The vehicle is a 1951 model 80 inch with wide springs at the front and narrow rear springs.


    Thanks for that Info, but the numbers do not add up to anything near 1,3 tonnes. Can I just use the ratios.


    From the table out of the manual as above,
    For the rear 371kgs
    206kgs + 165kgs

    For the front 474kgs
    237kgs + 237kgs

    44% (570kgs) of the weight at the rear and 56% (730kgs) of the weight up front. The rear can be split further with rear left and right weights?



    Erich
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  4. 7th January 2015, 11:47 PM #4
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    Hi Erich

    The specs from before were static load which I assume is the unladen sprung weight. TP138B specifies a "working load" of 324kg which I assume is per spring i.e. 648kg front axle

    the rear specs are WL LH 300kg and RH 340kg i.e. 640kg rear.

    Remember we are talking about the "sprung weight" when we discuss suspension. The weight of the axle assembly and tyres is the part of the tare and gross weight of the vehicle but is considered unsprung weight, so you have to subtract the weight of the assemblies and tyres from the tare to get the sprung weight and static load, then you have to subtract the same unsprung weight figure from the gross to arrive at the working load.

    Your spring bloke should be able to work with the specs from the manuals as the weight of the assemblies is irrelevant to the set of the springs. What he needs is the weights of the vehicle supported by the springs.

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  5. 8th January 2015, 10:05 AM #5
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    A little information I found out today, when calculating "unsprung weight" you include 1/2 the weight of each spring in the unsprung side.

    Apparently this is because some of the leaves are supporting the leaves above them so, by convention, 50% is calculated in both the sprung and unsprung weights.

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