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convict16
Joined: 01 Apr 2004
Posts: 31
Location: Pennsylvania
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| Posted: Wed Sep 29, 2004 9:22 pm Post subject: Question about horsepower. |
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| Does anyone know what bhp stands for? Every site I check for my car says 148 bhp. Is it the same as hp or diffrent? |
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Brando
Joined: 06 Jun 2003
Posts: 3067
Location: Michigan, USA
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| Posted: Wed Sep 29, 2004 9:30 pm Post subject: |
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It's basically the horsepower at the crank.
Here's the full definition:
The measure of an engine's horsepower without the loss in power caused by the gearbox, alternator, differential, water pump and other auxiliaries. The actual horsepower delivered to the driving wheels is less.
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73Delta88
Joined: 08 Jun 2003
Posts: 975
Location: Western Massachusetts
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| Posted: Wed Sep 29, 2004 10:43 pm Post subject: |
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| BHP = Base Horse Power |
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Brando
Joined: 06 Jun 2003
Posts: 3067
Location: Michigan, USA
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| Posted: Thu Sep 30, 2004 9:15 am Post subject: |
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73Delta88 wrote: BHP = Base Horse Power
Actually it's Brake Horsepower, or Crank Horsepower :wink:
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Brando |
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88delta88
Joined: 09 Jun 2003
Posts: 2407
Location: Canada
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| Posted: Thu Sep 30, 2004 11:54 am Post subject: |
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who coined the term "horsepower"? I have this feeling that we are degrading the status that horses used to hold "back in the day"... A full-grown horse could exert much more than one measly horsepower.
The power of a horse is also dependant upon the physical status, nutrients, and motivation of the animal. Much like an engine in many ways I suppose...
Excuse my ramble, I havent done so in a while... :-) |
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Brando
Joined: 06 Jun 2003
Posts: 3067
Location: Michigan, USA
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| Posted: Thu Sep 30, 2004 2:37 pm Post subject: |
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88delta88 wrote: who coined the term "horsepower"? I have this feeling that we are degrading the status that horses used to hold "back in the day"... A full-grown horse could exert much more than one measly horsepower.
The power of a horse is also dependant upon the physical status, nutrients, and motivation of the animal. Much like an engine in many ways I suppose...
Excuse my ramble, I havent done so in a while... :-)
The term was invented by James Watt in the 1700’s.
He wanted to be able to talk about the power developed by horses used in coal mines.
He determined that the average horse could complete 33,000 ft-lbs.. Of work in one minute. :D
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Brando |
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73Delta88
Joined: 08 Jun 2003
Posts: 975
Location: Western Massachusetts
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| Posted: Thu Sep 30, 2004 4:32 pm Post subject: |
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Brando wrote: 73Delta88 wrote: BHP = Base Horse Power
Actually it's Brake Horsepower, or Crank Horsepower :wink:
:oops: #-o |
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88 Coupe
Joined: 15 Feb 2004
Posts: 2963
Location: Southern California
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| Posted: Thu Sep 30, 2004 5:43 pm Post subject: |
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Hi All
Brando is correct re. James Watt and the HP standard.
HP and BHP are the same.
BHP stands for brake horsepower, and it is measured at the flywheel.
The term comes from the type of machine used to measure horsepower.
A dynomometer applies a braking force against the flywheel while the engine is under full acceleration and measures the amount of "brake" needed to contain the torque of the engine at given RPM.
The torque figures are then used in a math formula to calcuate the HP figures.
Prior to 1972, the manufactures ran these tests with only a water pump (it was needed for cooling). At that time the US government required that all future testing be done with all accessories attached.
BTW a chassis dyno works exactly the same, except the power is measured at the rear tires instead of at the flywheel.
Regards, Norm |
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