Horsepower vs. Torque ?

[the_undecider_imp]

Look at any dyno graph and torque and hp always cross at 5250 rpm. Torque is twisting force - newton meters or lb ft, gets you off the line and pushes a lot of weight. HP describes how much work is done over a given period of time, or the rate which work is done, so speed. If I knew more about physics, I might be able to explain why the two cross paths at 5250 rpm. Maybe a trip through the googlesphere will help...

[Dakota_imp]

Look at any dyno graph and torque and hp always cross at 5250 rpm. Torque is twisting force - newton meters or lb ft, gets you off the line and pushes a lot of weight. HP describes how much work is done over a given period of time, or the rate which work is done, so speed. If I knew more about physics, I might be able to explain why the two cross paths at 5250 rpm. Maybe a trip through the googlesphere will help...

They cross at 5252 because that is how the relationship is defined.
HP=(T*rpm)/5252. Nothing to do with physics. Do the math and see what rpm you get when HP=T.

Horsepower and watts are equivalent units. Both are instantaneous measurements and have nothing to do with "over a given period of time".

Horsepower is what does ALL work!!!

[the_undecider_imp]

Look at any dyno graph and torque and hp always cross at 5250 rpm. Torque is twisting force - newton meters or lb ft, gets you off the line and pushes a lot of weight. HP describes how much work is done over a given period of time, or the rate which work is done, so speed. If I knew more about physics, I might be able to explain why the two cross paths at 5250 rpm. Maybe a trip through the googlesphere will help...

They cross at 5252 because that is how the relationship is defined.
HP=(T*rpm)/5252. Nothing to do with physics. Do the math and see what rpm you get when HP=T.

Horsepower and watts are equivalent units. Both are instantaneous measurements and have nothing to do with "over a given period of time".

Horsepower is what does ALL work!!!

They cross at 5252 because that is how the relationship is defined.
HP=(T*rpm)/5252. Nothing to do with physics. Do the math and see what rpm you get when HP=T.

Horsepower and watts are equivalent units. Both are instantaneous measurements and have nothing to do with "over a given period of time".

Horsepower is what does ALL work!!!
I rounded to 5250, it's what I had recalled.

Isn't the rate of something a description of some measure over a given period of time?

[Dakota_imp]

Look at any dyno graph and torque and hp always cross at 5250 rpm. Torque is twisting force - newton meters or lb ft, gets you off the line and pushes a lot of weight. HP describes how much work is done over a given period of time, or the rate which work is done, so speed. If I knew more about physics, I might be able to explain why the two cross paths at 5250 rpm. Maybe a trip through the googlesphere will help...

They cross at 5252 because that is how the relationship is defined.
HP=(T*rpm)/5252. Nothing to do with physics. Do the math and see what rpm you get when HP=T.

Horsepower and watts are equivalent units. Both are instantaneous measurements and have nothing to do with "over a given period of time".

Horsepower is what does ALL work!!!

They cross at 5252 because that is how the relationship is defined.
HP=(T*rpm)/5252. Nothing to do with physics. Do the math and see what rpm you get when HP=T.

Horsepower and watts are equivalent units. Both are instantaneous measurements and have nothing to do with "over a given period of time".

Horsepower is what does ALL work!!!
I rounded to 5250, it's what I had recalled.

Isn't the rate of something a description of some measure over a given period of time?

They cross at 5252 because that is how the relationship is defined.
HP=(T*rpm)/5252. Nothing to do with physics. Do the math and see what rpm you get when HP=T.

Horsepower and watts are equivalent units. Both are instantaneous measurements and have nothing to do with "over a given period of time".

Horsepower is what does ALL work!!!
I rounded to 5250, it's what I had recalled.

Isn't the rate of something a description of some measure over a given period of time?
Power is the instantaneous rate of work being done. Think of the work it takes to light a 100W light bulb. Energy is the rate x time (think of your electric bill being kW*hrs).

[the_undecider_imp]

Gotcha. The light bulb example made me understand...if only I could think of an appropriate analogy

[gossman_imp]

[Elipten_imp]

Love it!


Sent from my iPad using Tapatalk

[the Ferret]

Lol seen that video before and it shows exactly what a force torque is . On the other end of the scale a Harley Electra Glide will turn high 12s thru the quarter and the BMW will turn low 10s and that shows exactly what a force horsepower is.

[flynrider]

That's an excellent demo of the difference. The sportbike has to wind up to higher rpms to deliver enough power to equal the Harley, which delivers a lot of torque at low rpms. That takes time. If the race was a bit longer (like a 1/4 mile or more) the Honda would easily take the Harley.

Back in my racing days I used to run my Kaw 750 twin against the Kaw/Hon/Yam/Suz 750 inline-4s. My bike delivered most of its torque at just above idle speed, but only made about 55 hp at the crank compared to around 70ish for the 4s. It used to drive them crazy on our tight road course that my "slower" twin could routinely pass them by in the long series of tight turns. When we hit the long straightaway, they'd be able to wind up their 4s and the superior hp would allow them to catch up. It was an excellent demo of low end torque vs. peak hp.

[CIP57_imp]

Got to love Hildo LMAO never seen this vid

Traded in a 2010 CBR1000RR for the CB, of all the sport-bikes i have owned its the toughest to launch and hookup, there's to much power for the short wheelbase, no traction control or any other assists, just pure power. You have to be on the tank with your nose on the shield to keep it down and than you had better watch your front end. This guy is scared and he should be taking an almost upright position. Not really a comparison but a lot of fun to watch.

You can launch a BMW, Suzuki, Yamaha liters which all have assists to help keep your front wheel down.