BHP e HP

[dkstz]

There are differences between BHP and HP? Some say just one or another...
ty.

 

[G.T]

HP is what power the engine is delivering at maximum strength.

Brake horsepower is the pump’s shaft output in terms of torque. In other words, brake horsepower takes into consideration not just the power of the motor, but all the other factors as well — things such as the rotor and fan size, and the amount of copper that is used.

Anyway anything else you need to know it probably in this thread. http://gtplanet.net/forum/showthread.php?t=18088&highlight=difference+BHP

End of subject.

 

[Tobes]

There are differences between BHP and HP? Some say just one or another...
ty.

Brake Horse Power is measured using a Brake Dyno or similar, eg the measurement is calculated by the resistance applied, hence BHP.

I think you may be refering to a BHP ATW reading (At The Wheels) compared to a flywheel BHP reading, they do vary, especially if the engine is put on a bench and tested at the flywheel without taking into account the power steering, alternator, air con etc....
A BHP ATW reading will always be lower than a reading taken ATF, i believe it's roughly 15%(ish) but could be mistaken.

 

['85fierogt]

most companies use bhp atf when they give specs. dont they?

 

[xcsti]

Unfortunatly most do it at the flywheel. Some times they purposly lower or raise the numbers (skyline/miata).

 

[Jmac279]

[QUOTE='85fierogt]most companies use bhp atf when they give specs. dont they?[/QUOTE]
SAE Net Horspower
In 1972, American manufacturers phased in SAE net horsepower. This is the standard on which current American ratings are based. This rating is measured at the flywheel, on an engine dyno, but the engine is tested with all accessories installed, including a full exhaust system, all pumps, the alternator, the starter, and emissions controls. Both SAE net and SAE gross horsepower test procedures are documented in Society of Automotive Engineers standard J1349. Because SAE net is so common, this is the standard we will use to compare all others.

DIN Horsepower
This is a standard, DIN 70020, for measuring horsepower that very closely matches SAE net. The conditions of the test vary slightly, but the required equipment on the engine and the point of measurement (flywheel) remains the same. Because the test conditions are so similar, it is safe to divide DIN horsepower by 1.0139 to arrive at SAE net. This value is so close to equal that for all but the most technical purposes DIN and SAE net are interchangeable.

DIN Horsepower is measured in ps while SAE Net is measured in bhp ... Both are measured at the flywheel ... Engines rated in kW typically use the DIN standard of testing ...

 

[Super Jamie]

and 1 hp = 1.01387 ps, i just use 1.01

you'll find most japanese cars come with a PS rating instead of Horsepower. because japanese horses are smaller maybe PS stands for Ponies?

 

[GameBoyFX]

and 1 hp = 1.01387 ps, i just use 1.01

you'll find most japanese cars come with a PS rating instead of Horsepower. because japanese horses are smaller maybe PS stands for Ponies?

small cars small horses

 

[Jedi2016]

I know PS is different, as mentioned above, but I believe that while the measuring system in HP and BHP are different, I believe the numbers are generally the same. 1BHP=1HP.

Feel free to correct me if I'm wrong.

 

[Tobes]

maybe PS stands for Ponies?

Actually, PS stands for Pferdestärke it's a German word when literally translated means horse strength



Edit -
1 PS = 735.49875 Watts
1 HP = 745.69987 Watts

 

[Firebird]

Pferdestärke is also known as "metric horsepower" or "continental horsepower". It's defined in the same way as horsepower, but uses metric units instead.

1 HP = 33,000 (lbf-ft)/min

1 PS = 75 (kgf-m)/s