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Thread: Article: BHP vs HP vs kW and other power conversions

  1. #16
    Official Off Topic KING! Conversion King stradlater's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    Correct, 5252 is the multiplier.

    Funnily enough, if you see a dyno graph in foot pounds and HP, graphing torque against power, you'll see that they ALWAYS cross over at 5252 if the graph is done properly.

    An interesting thing..
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  2. #17
    Cunning Linguist Domestic Engineer The Last Streetfighter's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    http://en.wikipedia.org/wiki/Horsepower

    Cheval (horse) Vapeur (Steam)

    Also, haven't you got those little conversion files Conversion.exe and Sapfile.exe.? They are both great.
    AE90 Silvertop - GONE; 2001 ST215W GT-T Manual - SOLD; EP82 Starlet GT - Sold
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  3. #18
    My Wife says I have Too Much Toyota o_man_ra23's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions



    .....and that is why you will be power stroking yourself to sleep each night
    Hmm... interesting concept... Ive got a missus to powerstroke me to sleep... but i dont know any chicks (even the geeks from uni days) who are impressed by a conversion table... just cant think of a way that it would come up in conversation.
    Chicks seem to prefer a smile, a compliment and an offer of an enjoyable evening alone around here... dont know how it is in other parts of the world tho.
    Cheers, Owen
    1977 RA28 with 1JZ-GTE (Was 18R-GTE)
    Lancer EVO Brakes into old Celica/Corolla/Corona
    Doing the things that aren't popular... cause being popular and being good are often distinctly different.

  4. #19
    Purple is the new black! Automotive Encyclopaedia sillycar chick's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    This thread is great, and I will add to it with this link to download an awesome program....

    http://joshmadison.net/software/convert/

    It doesnt have all the power conversions that have been listed, but it is handy when you have torque settings in a workshop manual which are in a different form to the torque wrench you have!! And I use it at work as well (because engineers are lazy) Enjoy....
    51LII - 1972 TA22 Celica | Morpheous Metallic | 4AGE 20v Silvertop | Razorback ECU | W58
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    There is not much hotter than a Freshly painted Celica, Unless its the reflection of a freshly painted Celica on a freshly painted Celica

  5. #20
    Purple is the new black! Automotive Encyclopaedia sillycar chick's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    Quote Originally Posted by o_man_ra23
    ... but i dont know any chicks (even the geeks from uni days) who are impressed by a conversion table... just cant think of a way that it would come up in conversation.
    Chicks seem to prefer a smile, a compliment and an offer of an enjoyable evening alone around here... dont know how it is in other parts of the world tho.
    hahahahaha I always think I am the only chick who would be/is impressed by a conversion table LOL!! But im just a phreak anyways being so into fixing cars and all
    51LII - 1972 TA22 Celica | Morpheous Metallic | 4AGE 20v Silvertop | Razorback ECU | W58
    Toyota Car Club (Qld)

    Quote Originally Posted by TheToyman75 View Post
    There is not much hotter than a Freshly painted Celica, Unless its the reflection of a freshly painted Celica on a freshly painted Celica

  6. #21
    Junior Member Grease Monkey MacroP's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    And if anyone wants to know the metric conversion it's.

    P = 2x Pi x N xT
    P = Power in Watts
    N = Revolutions per sec
    T = Torque in Newton Metres
    So it's P=2PiNT/1000 for Kilowatts.

  7. #22
    Toymods Board Member Chief Engine Builder Hiro's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    Quote Originally Posted by stradlater
    2CV.. Hehe. I like that...
    that's one powerful car.
    The CV in that sense isn't literal horsepower, but rather a "tax" horsepower. The tax horsepower was based upon cylinder dimensions mathematically, and thus didn't take into account head or exhaust work - all cars of specific dimensions were deemed equal. Think of it like the kei class in Japan, where they have to be a specific width and have a maximum sized engine, but it doesn't matter how much or little power they output.

    By the end of the 2CV's run, it's actual horsepower was much greater (well, relatively) than it's 2 HP tax rating, but the name had stuck

  8. #23
    Altia ER34 GTT Domestic Engineer JetspeedCamry's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    Ive always found this site useful for quick calcs.

    http://www.mr2ownersclub.com/converter.htm

    Great thread btw
    Kind Regards,
    Kurt.

    1998 ER34 ニッサン スカイラインGT- T
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  9. #24
    potato Automotive Encyclopaedia joecoolmk2's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    Quote Originally Posted by sillycar chick
    This thread is great, and I will add to it with this link to download an awesome program....

    http://joshmadison.net/software/convert/

    It doesnt have all the power conversions that have been listed, but it is handy when you have torque settings in a workshop manual which are in a different form to the torque wrench you have!! And I use it at work as well (because engineers are lazy) Enjoy....

    sweet find, thankx for sharin it! +ve rep...

    i have a new bible...
    beer me!

  10. #25
    Junior Member Domestic Engineer myne's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    http://www.users.on.net/~jvizard/myn...Calculator.zip

    I wrote that a long time ago, enjoy.

  11. #26
    Junior Member Domestic Engineer crowncustom's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    Just remember that there is 2 ways that horse power is represented with an engine.
    1.Flywheel horse power which is the true output of just the engine.Where the engine itself alone with nothing bolted behind it is set in a bench dyno eg.engine cradle.
    2.Rear wheel horse power which is the output the car is producing at the rear wheels which includes,clutch/pressure plate,Throwout bearing,gearbox,tailshaft,diff,axles and rims/tyres.
    There is no difference between HP and kW they are the same measurement.Its just that Hp is the imperial side and kW is the metric side of things.Just like inches and millimetres.Old to new.
    1 HP=0.746kW
    1kW=1.34HP
    Cheers Brett.

  12. #27
    My Wife says I have Too Much Toyota o_man_ra23's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    Im with brett on this. Kilowatt and HP are both measures of a motor's ability to perform work... just on different scales. Also anyone who tries to say a car will be faster due to a higher peak power figure may well be power stroking. The overall power or torque curve is much more important, as this will determine a vehicle's characteristics. You can get a quicker ET with a lower TV if you accelerate quicker from a lower RPM.

    Cheers, Owen
    Cheers, Owen
    1977 RA28 with 1JZ-GTE (Was 18R-GTE)
    Lancer EVO Brakes into old Celica/Corolla/Corona
    Doing the things that aren't popular... cause being popular and being good are often distinctly different.

  13. #28
    Junior Member 1st year Apprentice 3T-GTE's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    Great contribution Strad...

    If you, or anyone, has the time to do some more research ...
    I'd be keen to see a reliable flywheel to rearwheel conversion formula & vice versa.

    From what I can see around, most people work on rearwheel being somewhere between 70% to 80% of the flywheel power.

    I know that this gets complex when you look at various drivetrain configurations, etc, but surely their could be some reliable way of doing this, that would help to resolve a few debates.

  14. #29
    Junior Member Carport Converter SL666's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    no.. there isn't..

  15. #30
    My Wife says I have Too Much Toyota o_man_ra23's Avatar
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    Default Re: Article: BHP vs HP vs kW and other power conversions

    SL666 is dead on there... Waaaaay too many variables such as maintenance factors, bearing tightness, oil viscocities, rotating part mass just to name a few.
    Cheers, Owen
    1977 RA28 with 1JZ-GTE (Was 18R-GTE)
    Lancer EVO Brakes into old Celica/Corolla/Corona
    Doing the things that aren't popular... cause being popular and being good are often distinctly different.

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