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minidrifter
 Post subject: bhp and hp
PostPosted: Mon Jun 04, 2007 4:16 pm 
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im was curious, whats the difference between bhp and hp?

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Blokeinamoke
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PostPosted: Mon Jun 04, 2007 4:21 pm 
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Then god invented wikipedia

http://en.wikipedia.org/wiki/Brake_hors ... _.28bhp.29
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minidrifter
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PostPosted: Mon Jun 04, 2007 4:22 pm 
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what on earth would we do without wikipedia. lifesaver (specially in school) thanks BIAM

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Last edited by minidrifter on Mon Jun 04, 2007 4:25 pm, edited 1 time in total.

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sports850
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PostPosted: Mon Jun 04, 2007 4:23 pm 
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Laziness in typing the b I think . The proper term is Brake Horse Power but it's been shortened over time to just Horse Power .

Disclaimer , if I'm wrong and there is or was a difference originally can somebody please tell me ?

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drmini in aust
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PostPosted: Mon Jun 04, 2007 4:34 pm 
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sports850 wrote:
Laziness in typing the b I think . The proper term is Brake Horse Power but it's been shortened over time to just Horse Power .

Disclaimer , if I'm wrong and there is or was a difference originally can somebody please tell me ?

There is also the so-called RAC rated HP. This was/is? used in UK for registration purposes, and was here too once.
Formula is- (bore² x no of cyls)/2.5.
Stroke?? doesn't matter. that's one reason why British engines were built with long strokes.

see http://en.wikipedia.org/wiki/Horsepower and scroll down to RAC HP.

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cush
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PostPosted: Mon Jun 04, 2007 4:47 pm 
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drmini in aust wrote:
There is also the so-called RAC rated HP. This was/is? used in UK for registration purposes, and was here too once.
Formula is- (bore² x no of cyls)/2.5.
Stroke?? doesn't matter. that's one reason why British engines were built with long strokes.


i'm guessing that's in inches... :)

850cc = 9hp RAC

:shock:

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drmini in aust
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PostPosted: Mon Jun 04, 2007 4:51 pm 
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cush wrote:
drmini in aust wrote:
There is also the so-called RAC rated HP. This was/is? used in UK for registration purposes, and was here too once.
Formula is- (bore² x no of cyls)/2.5.
Stroke?? doesn't matter. that's one reason why British engines were built with long strokes.


i'm guessing that's in inches... :)

850cc = 9hp RAC

:shock:

Oops yes of course.. inches, da UK standard unit of measurement. 8)

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VicMini13
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PostPosted: Mon Jun 04, 2007 4:51 pm 
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Way back in the olden days when I was at school we were taught that Horsepower was a measurement of the power required to lift a stationary weight vertically from rest - while Brake Horsepower was the measurement of power required to hold a stationary weight vertically suspended without dropping
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Menangle_Mini_Man
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PostPosted: Mon Jun 04, 2007 5:27 pm 
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I just checked Wiki and with an explanaton like that I'd rather not know. It goes on forever and ever and ever.
:lol:
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Mick
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PostPosted: Mon Jun 04, 2007 5:53 pm 
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Location: Under the bonnet son!
Just to throw another one in there:


Quote:
Power equals work over time, so it is a measure of the work that can be done in a given space of time by one standard unit 19th century nag.

then the germans being ever so efficient invented the metric horse. It's height is measured in centimeters instead of hands, it eats kilograms instead of chaff and gallops in KPH instead of miles.

1 PS = 75 kp·m/s = 0.73549875 kW = 0.9863201652997627 hp (SAE)


They called it the P.S. It's for all intents and purposes the same, but is marginally corrected. Motorbikes horsepower measurements often use this. You gotta love the krauts and their efficiency.

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Smokie
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PostPosted: Mon Jun 04, 2007 6:27 pm 
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Quote:
Way back in the olden days when I was at school

Didn't they still use horses to pull things in those days and cars were steam driven VicMini13???? :wink:
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VicMini13
 Post subject:
PostPosted: Mon Jun 04, 2007 10:12 pm 
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Smokie wrote:
Quote:
Way back in the olden days when I was at school

Didn't they still use horses to pull things in those days and cars were steam driven VicMini13???? :wink:


Ha ha..... when I was walking 6 miles to school every day I use to dream of a horse :lol: :lol: :lol:
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Blokeinamoke
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PostPosted: Tue Jun 05, 2007 4:34 am 
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VicMini13 wrote:
Smokie wrote:
Quote:
Way back in the olden days when I was at school

Didn't they still use horses to pull things in those days and cars were steam driven VicMini13???? :wink:


Ha ha..... when I was walking 6 miles to school every day I use to dream of a horse :lol: :lol: :lol:


you filthy man you :shock:
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Mike
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PostPosted: Tue Jun 05, 2007 5:15 am 
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Just continuing with the irrelevant info theme: Was reading a boating magazine during the lunch brake at work (there's a whole stack of them for some reason) and apparently marine engine hp figures are now given at the propeler (whereas in the past it was at the output shaft like auto engines).

By the way the Top Gear team are apparently unaware of the difference between bhp and hp at the wheels coz in the new series they review the (hideous and garish) new Ford Mustang GT and put it on a chasis dyno and then complain that there's an 80hp difference between the quoted bhp figures and the chassis dyno output (which seems about right for transmission and torque shaft losses etc). Its similar to J.Clarkson measuring all torque outputs in "torques" and vehicle polution ratings in "carbons".
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sports850
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PostPosted: Tue Jun 05, 2007 6:07 am 
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Mike wrote:
apparently marine engine hp figures are now given at the propeler (whereas in the past it was at the output shaft like auto engines).



That's why older 40 hp outboards seem gutless compared to new 40 hp outboards , not sure why they changed but it makes a difference .

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