Converting "Dry Weight" to "Kerb Weight" | FerrariChat
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Converting "Dry Weight" to "Kerb Weight"

Discussion in 'Technical Q&A' started by Admiral Thrawn, Dec 20, 2005.

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  1. Admiral Thrawn

    Admiral Thrawn F1 Rookie

    Jul 2, 2003
    3,932
    #1 Admiral Thrawn, Dec 20, 2005
    Correct me if I'm wrong:

    Dry weight is the weight of the car minus fuel, driver and cargo.

    Kerb weight is the weight of the car plus a full tank of fuel and 75kg driver.

    What assumption is made for the weight of fuel? 0.66kg?

    Ferrariworld.com lists the dry weight of the F40 at 1100kg.

    The car takes 120 litres of petrol, so at 0.66kg / litre,

    1100kg + 79.2kg + 75kg = 1254.2kg

    Which is pretty close to the 1254kg kerb weight listed in the book "Ferrari" by Hartmut Lehbrink.

    Can anyone confirm that this fuel weight is correct?
     
  2. iceburns288

    iceburns288 Formula 3

    Jun 19, 2004
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    Bay Area, CA
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    Charles M.
    #2 iceburns288, Dec 20, 2005
    I think fuel is closer to 76kg/l. Well, 76g/cm^3.

    EDIT google says 73. Which would make the kerb weight of an F40 1262kg... good enough eh ;)
     
  3. Admiral Thrawn

    Admiral Thrawn F1 Rookie

    Jul 2, 2003
    3,932
    #3 Admiral Thrawn, Dec 21, 2005
    Could you please post a link?

    I can't find anything definitive on the subject - every site seems to list something different.
     
  4. stephens

    stephens F1 Rookie
    Lifetime Rossa

    Feb 13, 2004
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    Stephen S
    #4 stephens, Dec 21, 2005
    Unfortunately, there is not enough consistency in these measures, so you can only guess.
    Dry weight *can* mean, weight minus all fluids. Some manufacturers go so far as to list the weight every fluid, e.g. minus the oil in shocks etc! Others mean the weight of the vehicle without fuel.

    Kerb weight can mean the weight of the vehicle with out fuel, with fuel or with fuel and driver.
    A good comparative definition is the EU standard, which means with all fluids, 90% full tank of fuel, 68kg driver and 7kg of luggage, includes spare tyre, tool kit etc.
     
  5. ferrarifixer

    ferrarifixer F1 Veteran
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    Jul 22, 2003
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    Phil Hughes
    #5 ferrarifixer, Dec 21, 2005
    There is no definitve answer.

    But fuel weight can be got from the "specific gravity" as listed by the manufacturers. Typically, it's about 0.74-78kg/l as stated already.

    Put 'em on the scales is the only way. A paint job can easily add 15-20 kg too, so regardless of claims... weigh them is the only way.
     

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