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post #1 of 12 Old 05-06-2006, 07:33 PM Thread Starter
 
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New to the tech talk

Im a new ninja owner.Im just wondering what's the difference between horsepower and having torque and how does each effect the ride?
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post #2 of 12 Old 05-06-2006, 09:33 PM
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Oh boy ...

This is something that engineers understand intuitively, but non-technical people cannot seem to grasp at all.

Fundamental equation of physics: F = m A
(Force = Mass x Acceleration) - if all of the measurements are in SI units then no conversion factors are necessary. This can be rearranged:

A = F / m

Acceleration = Force divided by mass. The mass "is what it is", this equation shows that the acceleration depends on the force applied.

The equation above implies "linear" geometry; motion in a straight line. Many mechanical things, including engines and wheels, operate in a rotary fashion. Torque is a force applied in a rotary manner.

The engine makes a certain amount of torque. The torque is multiplied through the gearbox and final drive ratios (what is lost in speed is gained in force - that is how gear ratios work - if you look at maximum power output condition, the engine speed of 12,000 rpm is reduced by a factor of about 8 through the gearbox and final drive to around 1500 rpm rotation of the rear wheel - but the torque is multiplied by 8 times excluding the frictional losses).

The rear wheel converts that final output torque into a straight line force of you accelerating forward, and that is what you feel when you open the throttle.

We have not said a word about horsepower yet.

Power = Force x Speed

You can apply a torque equivalent to the engine output torque, by applying a torque wrench to the crankshaft with the transmission in gear. Of course, you cannot do this with any great *speed*. Whatever acceleration you could generate by doing this, would be over in a heartbeat.

Torque is what you feel when you open the throttle. Horsepower is what it takes to do that simultaneously with moving fast to begin with.

Torque is what it takes to get a huge load moving. A tractor-trailer, for example, has an engine with enormous torque, and it has an enormous gearbox after that, in order to be capable of getting a huge load moving. But it cannot accelerate much *at speed*.

Your bike has an engine with relatively little torque (on the automotive scale; for example my VW diesel has twice as much). But it can make that torque when travelling at a high speed, and it is in a light vehicle.

Is this understandable, or is it as clear as mud at this point?


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post #3 of 12 Old 05-06-2006, 09:55 PM
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check out the big brain on Go Faster

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post #4 of 12 Old 05-06-2006, 10:01 PM
 
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Quote:
Originally Posted by ninjaridr
Im a new ninja owner.Im just wondering what's the difference between horsepower and having torque and how does each effect the ride?
:headshake
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post #5 of 12 Old 05-06-2006, 10:05 PM
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Quote:
Originally Posted by treyzx10r
check out the big brain on Go Faster
lol...I think of it this way....HP and high revs can makes up for loss of torque. That's why high torque harleys and other bikes can get their but spanked by a High HP reving bike even though it's way down on torque.


but Go Faster...good post anyway.
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post #6 of 12 Old 05-06-2006, 10:09 PM
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isn't it HP = (torque X RPM)/ 5252 ??? or sumtin like that?

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post #7 of 12 Old 05-06-2006, 11:57 PM
 
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Go Faster, as usual came through with an awesome post. i'll dumb it down a little.

horsepower is the amount of 'work' that can be done in a given period of time. time in this case is the RPM band. Torque is the force required to do that work.

good question though, keep it up.
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post #8 of 12 Old 05-07-2006, 01:18 AM
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you "feel" torque, you "see" in mph on the speedo caused by horsepower pulling you along. HP is measued by how long it takes to pull 1lb in 1 sec. gearing up or down adjusts that "feel" and top mph speed

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post #9 of 12 Old 05-07-2006, 04:21 AM
 
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Hell I thought I new but gofaster went deep on it
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post #10 of 12 Old 05-07-2006, 05:31 AM Thread Starter
 
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And who says you cant learn somethin new everyday?Thanks for the info guys.
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