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Thread: A little request: CV and Kg

  1. #1
    cloudXXI's Avatar
     

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    A little request: CV and Kg

    Please ISI, allow settings with power in CV AND weigth in kg.

    If I select Imperial I donīt understand pounds; if I select metric, I donīt understand Kw.

    Well, obviously I know what Kw and pounds are, but itīs just something no european person use in vehicles terminology.

    I know itīs a little issue, but Iīm tired of calculating to understand the power and weight of the cars.

    Thanks.

  2. #2
    patryksok.'s Avatar

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    What? kW are normal unit used in automotive engineering, what you dont understand?

    1CV, HP, or whatever you name it is 745.69987158227022 W(wiki - mechanical horsepower)...so whats the problem?

    HP or CV are units after loss in power on gearbox etc.(power on wheels)
    BHP are before loss in power on gearbox etc.("clean" engine power)

  3. #3
    cloudXXI's Avatar
     

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    I have never listened anyone talking about how many Kw his car has. Maybe in Poland, but not in Spain.

    I can do a converstion, of course. But it would be easy display power in CV. I donīt know anyone that use Kw for power in a car.

  4. #4
    ethone's Avatar

     rFactor 2 Validated PC Specification rF2 Rank Laptimes Modding Group: virtua_lm 

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    Maybe in Poland and Germany then.

  5. #5
    patryksok.'s Avatar

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    Yes, but we are moving in SI units and watts are derivered SI units Thats all about In engineering you can only provide SI units and its derivatives and all sims are sort of automotive engineering.

  6. #6
    cloudXXI's Avatar
     

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    So when you watch a TV commercial of a car, the power is showed in Kw?

    I didnīt known it. I thought everybody still used CV.

  7. #7
    LesiU's Avatar

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    Quote Originally Posted by patryksok. View Post
    What? kW are normal unit used in automotive engineering, what you dont understand?

    1CV, HP, or whatever you name it is 745.69987158227022 W(wiki - mechanical horsepower)...so whats the problem?

    HP or CV are units after loss in power on gearbox etc.(power on wheels)
    BHP are before loss in power on gearbox etc.("clean" engine power)
    Just to clarify.... CV, HP, PS might be the same or not. You have DIN HP (which is the same as CV and PS) and you have SAE HP (american) and they are not the same.
    Also, BHP means "brake horse power" and as that, can be DIN CV/HP/PS or SAE HP.

    On the other hand, it would not hurt anybody if we could see power rating in units different than kW (I mean, both kW and switchable DIN/SAE HP). In car brochures, we usually see both ratings provided: kW and HP rating for a given country.

    Does Germans use SAE net HP rating for their cars? No, they use DIN HP instead, and so do most of Europe. Americans use SAE HP values, not DIN.... but kW is SI unit (beeing used all around the world) so that is understandable, why ISI is using it.

  8. #8
    patryksok.'s Avatar

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    HP/BHP/CV are popular/common terms to specified car power, thats because why everybody use them.

  9. #9
    zemaniac's Avatar

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    SI FTW!

    A NASA mission epic-failed because of a unit misunderstanding between Americans and Europeans... that's why the SI exists.

  10. #10
    O11's Avatar
     

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    Oct 2010
    But then again, playing a video game isn't exactly rocketscience, isn't it?


    *prum pssshhh*

  11. #11
    MaXyM's Avatar

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    Quote Originally Posted by cloudXXI View Post
    I have never listened anyone talking about how many Kw his car has. Maybe in Poland, but not in Spain.
    To clarify, in Poland HP units are used. KW (kilo Wats) are commonly used for example in Czech Republic.

  12. #12
    jubuttib's Avatar

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    People are still stuck in BHP, but all the magazines are starting to convert to kW (in Finland they've already done this), better to learn it now. I do like horsepowers, but there are many problems with them, major one being the sheer number of different definitions for them. Kilowatts are just kilowatts.

  13. #13
    PLAYLIFE's Avatar

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    Quote Originally Posted by zemaniac View Post
    SI FTW!

    A NASA mission epic-failed because of a unit misunderstanding between Americans and Europeans... that's why the SI exists.

    It was in fact two American teams, Lockheed Martin and NASA Jet Propulsion Laboratory. LM were using imperial whilst NASA JPL were using metric.

  14. #14
    Lazza's Avatar

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    Quote Originally Posted by cloudXXI View Post
    So when you watch a TV commercial of a car, the power is showed in Kw?

  15. #15
    GTrFreak's Avatar

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    Looool

  16. #16
    Alicatt's Avatar

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    Quote Originally Posted by jubuttib View Post
    Kilowatts are just kilowatts.
    Depends on where you measure them as well, is it crankshaft, gearbox or wheel, is it the amout of energy you put into the system or take out? Just the same as BHP

  17. #17
    DiscoTec's Avatar
     

    New Member
    Oct 2010
    note...important only is WHP and torque

  18. #18
    cloudXXI's Avatar
     

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    By the way I told CV instead of HP. I forgot to translate. But I see everybody has understood what I was trying to say.

    In Italian (Cavalli Vapore), Spanish (Caballos de vapor), and Portuguese (Cavalo-vapor), CV is the equivalent to the German, PS

  19. #19
    jubuttib's Avatar

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    Quote Originally Posted by Alicatt View Post
    Depends on where you measure them as well, is it crankshaft, gearbox or wheel, is it the amout of energy you put into the system or take out? Just the same as BHP
    Of course where you measure it makes a difference, but there is only one definition of how much power a kW is, where as with horsepowers there are at least 5 (more if you count some archaic ones) that are just plain different amounts of power. When talking about wheel kilowatts vs. crank kilowatts, you'll at least know the "kilowatt" part is the same no matter who is talking. When comparing HP vs BHP you have to take into account that yes, they're measured from a different point and also what definition of horsepower was used.

  20. #20
    jubuttib's Avatar

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    Quote Originally Posted by DiscoTec View Post
    note...important only is WHP and torque
    The only important one is torque, since power is basically just torque times revolutions. If you know engine revs and torque, you can calculate power. The two are in no way separate entities, just expressed in a different way.

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