what do you mean by "BHP" as it associated with motorcycle/car engine spcification?

Question

i have seen in engine specification about "bhp" as i know "hp" stands for horse power but "b" stands for what? as the power is measured in bhp then what is the diffrence in bhp and hp.how it is measured? whether it depends on the block/piston and piston ring settings?

Answer 1

It is Brake Horse Power, It depends on which cubic capacity your engine have, bhp is real power of your engine have, and hp it produces. This is a technical question and need lot more details to explain which this page do not provide, It is measured by Cubic Capacity of engine and piston stroke, and combustion, and how much fuel it is getting when started

Answer 2

venkatraman and foxbat are exactly wrong

I don't know what minootoo is trying to say.

Stretch is correct. Here is my answer from last time I saw this question phrased as "What is BHP?"

A lie

A random number between the gross horsepower and the actual brake horsepower

BHP is the horsepower at the wheel, after all accessories and driveline losses. Gross HP is what venkatraman was talking about. Back in the Muscle Car days the manufacturers quoted gross, until the numbers got so big that the insurance companies started freaking out, then they would just make something up. Then in the 70s they started using SAE net, which included accessories such as water and oil pump, but not driveline losses. For a long time Porsche was the only company that actually quoted true BHP (hence the 205 BHP 911 was substantially faster than the 225 ?hp mustang), but even they have wandered somewhat. Now car manufacturers and advertorials, er I mean car magazines, all say BHP but it's not. For instance, the 290"bhp" NSX is actually putting down about 220 HP at the wheel. The amount that the manufacturer lies varies by Asianess of the vehicle.


Hammer is completely wrong as well. People come up with the strangest derivations of the word "brake" in this context. It means "brake" as in the "brakes" on the car. It is how much braking power it take to stop the drive wheels. BHP is the power at the wheels AFTER all accessories and driveline losses. End of story. Period. Jeez. Don't answer if you don't know. If you want the two points just say "hi" or something, don't make up a bunch of bvllshit.

Watching the sunset and smarty pants, you are both wrong and it is wrong in wiki. And it doesn't have anything to do with 'how long it takes to slow the car down" learn to read you moron. You idiots are talking about SAE Gross. Look it up, somewhere other than wiki.

Answer 3

BHP stands for Brake Horse Power.

Answer 4

Dumbass, what are you talking about. Apparently you are the one making up "bvllsh*t" to get your 2 points. Hammer is absolutely correct, bhp means brake horsepower and is the power at the output shaft of an engine, before accessory power loss.
And brake does refer to a friction brake used to calculate torque and power.

brake horsepower

• noun an imperial unit equal to one horsepower, used in expressing the power available at the shaft of an engine.
from Oxford English Dictionary

Chassis dynamometer
A chassis dynamometer measures power from the engine through the wheels. The vehicle is parked on rollers which the car then turns and the output is measured. These dynos can be fixed or portable.
Because of frictional and mechanical losses in the various drivetrain components, the measured horsepower is generally 15-20 percent less than the brake horsepower measured at the crankshaft or flywheel on an engine dynamometer. (John Dinkel, "Chassis Dynamometer", Road and Track Illustrated Automotive Dictionary, (Bentley Publishers, 2000) p. 46

[1]Brake horsepower is the amount of power being delivered by a rotating shaft that is driving a load. It is the horsepower actually delivered by the shaft of an electric motor, an engine, or any other source.
The name of the term comes from the traditional way it is measured: a friction brake called a prony brake (there are other types of brakes) is clamped around the shaft. The prony brake works much like an automotive drum brake. The brake is fitted with a projecting radial torque arm of specified length (L in the diagram). With the shaft rotating, the brake is tightened and the force at the end of the torque arm and the shaft rpm are measured. (from home.mchsi.com/~gweidner/horsepower.pdf )

In General:
Indicated or gross horsepower (theoretical capability of the engine)
minus frictional losses within the engine (bearings, rods, etc), equals
Brake or net horsepower (power delivered directly by the engine)
minus frictional losses in the transmission (bearings, gears, etc.), equals
Shaft horsepower (power delivered to the driveshaft)
minus shaft losses (friction, slip, cavitation, etc), equals
Effective or wheel horsepower

Dumbass....you are.

Answer 5

Brake Horse Power

Answer 6

After reading the answer from DUMBASS I can see why he chose that user name. The question has been correctly answered by Venk & Hammer, BHP is the engine power measured at the crankshaft, like on a dynomometer.

How he can say it has something to do with how long it takes to slow a car down is just idiotic.

Sorry dumbass, I just can't seem to find anything, anywhere, to support your statements. Maybe you can find a source that states that Brake horsepower is measured at the wheels?? I think we'd all be interested in seeing that DUMBASS!!!!

Answer 7

Brake horsepower (bhp) is a measurement of a motor's horsepower without the loss of power associated with the transmission, alternator (or generator), drive gears or chain, water pump, etc. The torque is measured at the motor's output shaft, and then using engine speed, horsepower is calculated.
The horsepower delivered to the driving wheels is less due to friction (or resistance) from all the other moving parts. "Brake" refers to a piece of equipment known as a band brake that is used to measure torque. The brake applies measurable resistance to a rotating drum attached to the output shaft of the motor. Torque is multiplied by engine speed and the circumference of the drum to give the power. By the way, power band refers to the distribution of said horsepower throughout the rpm range of a motor, not to some special piece of performance equipment (just thought I would throw that in).


Dumbass, you are just that. If I were you, I would delete myself. Please do not listen to dumbass, and if you do not believe what I said, look it up.

Answer 8

The engine on test stand may have any HP say 200, real large motorcycle/medium size car.

But going up hill, down hill when mounted on or inside the car it has lot less HP for speeding and reducing speed or breaking, so coming down hill a good driver will drop a gear and let the engine do the breaking, this is safer then riding the break all the time, the break pads and the disc or drum will not get glassed and drive have batter control of the car.

It may be called available HP, reserved HP.

PS:
We need only 15 HP for small car total weight 2000 Lbs. to go at 60 miles per hour on flat surface. So rest is for reserve capacity to get out of danger or applying breaks. I had 500 HP Engine in my Chrysler 76 Monaco car, Breaking HP was only 35 HP. Car weighed 4000Lbs, additional capacity was 2000Lbs for 6 people + luggage, gas reserve tank, extra pumps, extra speeding package........ up to 160 miles per hour.

Answer 9

Brake Horse Power=Horse power at the (driving) wheel.

Answer 10

bhp - brake horse power , look it up