How about this: Torque means Power for a given RPM

Since Power=Torque*RPM*constant

Therefore, at certain RPM, Power and Torque can be derived from each other with no abiguity.
i.e. torque and Power are 一一对应 at any given rpm.

To me, at ceratin RPM, torque and power is just
a different expression of the same thing.

Torque is more straight forward, since it is linear to the drive force you feel, while horsepower is a more
acceptable number to do marketing.

Here is a analogy (比喻):
suppose you are moving bricks for a builder.

rpm = how many times you can make a round trip
within one hour
torque = how many bricks you are carrying each time
power = how many bricks you can move within one hour

As you can see,

we can see how many bricks you are carrying each time (torque), this is straight forward.

But we have to wait til the end to see how many bricks
you have moved after one hour (power), this one is not
straight forward.

I guess that's why we saw both torque and hp on the engine performance graph:

Torque gives you direct impression on how much force you will feel at each certain rpm,

while horsepower gives you a scientific figure on how much work can the engine produce for certain time.

所有跟帖： 

• 你这个比喻是对的。 -润涛阎- ♂ (0 bytes) () 07/01/2009 postreply 20:42:24

• Don't forget the function of transmission -TBz- ♂ (165 bytes) () 07/01/2009 postreply 22:04:52

• 回复：Don't forget the function of transmission -wolfmanii- ♂ (1181 bytes) () 07/02/2009 postreply 06:34:16