bhp, cc, kw, power weight ratio

[grotbag]

I know, I know but there you go .................. another one of 'those' questions, well three actually...... possibly more depending on how blond I am when I interpret your answers

Is brake horse power to do with the acceleration of the car / bike and the top speed it will do?


Having only ever bought cars before I understand the different engine sizes (1,200, 1,400, 1,600 etc) the bigger the engine size = more powerful car, and I've got the hang of it with bikes in cc's, I think.


What I don't get is power output in kilowatts and does power / weight ratio mean the fatter the person is sat on it that it will go slightly slower


.......................... as I'm feeling very, very blond today, please answer as if your explaining to a ten year old

[druidsam]

dont understand it all myself grotbag,i usually just ask" how fast does it go mister"



...............................Sam

[Spree]

Power to weight usually means BHP per ton

Power output in Kilowatts is the european version of BHP

BHP needs looking at closely as some manufacturers show this reading from the crankshaft. The one that matters is what it produces at the rear wheel.

Horsepower (hp, bhp) Abbreviated as hp, as in 200-hp engine, or bhp (brake horsepower or net horsepower) to designate power produced by an engine. In general, the higher the horsepower, the higher the vehicle's top speed. One horsepower is the power needed to lift a 550-pound weight one foot in one second.

[Rerb]

1 hp ≡ 33,000 ft·lbf/min by definition
= 550 ft·lbf/s since 1 min = 60 s
= 550 × 0.3048 × 0.45359237 m·kgf/s since 1 ft = 0.3048 m and
= 76.0402249068 kgf·m/s 1 lb = 0.45359237 kg
= 76.0402249068 × 9.80665 kg·m²/s³ g = 9.80665 m/s²
= 745.69987158227022 W since 1 W ≡ 1 J/s = 1 N·m/s = 1 (kg·m/s²)·(m/s)

[Rerb]

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

[peanut]

does that help

..peanut.

[Rerb]

What I understand = A 20 horse power engine has the same power as twenty horses, then the Europe tries to metrificate it (I made that word up) so it doesn't make as much sense
I'm certain Spree's right about the main difference between BHP and Kw(SAE) being the latter is measured from the engine instead of the wheels.

[Rerb]

Peanut, you sneaked one in between posts

[grotbag]

Originally Posted by Rerb

1 hp ≡ 33,000 ft·lbf/min by definition
= 550 ft·lbf/s since 1 min = 60 s
= 550 × 0.3048 × 0.45359237 m·kgf/s since 1 ft = 0.3048 m and
= 76.0402249068 kgf·m/s 1 lb = 0.45359237 kg
= 76.0402249068 × 9.80665 kg·m²/s³ g = 9.80665 m/s²
= 745.69987158227022 W since 1 W ≡ 1 J/s = 1 N·m/s = 1 (kg·m/s²)·(m/s)

[grotbag]

Originally Posted by druidsam

dont understand it all myself grotbag,i usually just ask" how fast does it go mister"



...............................Sam

Is the answer I understand and will use!!!