I would say the major difference is that torque does not involve time. You can torque a bolt to 100 ft lbs, then hang a weight on the end of the wrench to equal 100 ft lbs, then walk away. Nothing will happen even though 100 ft lbs is being applied to the bolt.

Because the HP equation includes RPM, force over a given time is involved and therefore work is implied.

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico

Torque is, one ft lb = a wrench 1' long with 1 lb of force on the end. That said in the bush in foreign countries where they dont have a torque wrench, we had bolts needing 450 ft lbs. We took a 3 meter pipe (near 10 ft long) and pulled on the end of it with a fishing scale to 19 or 29 Kilos something like that to get the 450 ft lbs at the bolt.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Say it with a pic

Torque is steady state force.  Once motion is applied, it becomes horsepower.

Lorena, Texas (South of Waco)

Torque from wikipedia

http://en.wikipedia.org/wiki/Torque

 Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)

An editorial in issue #109 of Y-Block magazine discusses Horsepower & Torque. I quote, "Torque is rotational force, alone. There is no work from the torque." (un quote) Then it goes on to explain how Horsepower is derived, in part from torque. I'm left scratching my head some about the statement "There is no work from the torque" It seems to me that rotational force is a measurement of work. No?. If it isn't, why is it used as a measurement of engine performance at all. Horsepower is a calculated amount which is subject to several variables, including altitude, air density etc. (And not to mention some of the biggest lies I've ever heard!) Also, the origins of it are suspect somewhat to start with. Plus there is gross power & net power etc. Also, the equipment used to measure it often vary in accuracy substantially. So.. can someone clerify for me the quoted statement about torque? Thanks

Paul