Horsepower/ torque site!

[5B Steve]

   Came across this site and thought I would share it with everyone for those who didn't know it was there.


   DRAGTIMES.COM    It has a calculator for horsepower and RPM .  Check it out!

   Steve 5B....

[Lee Bradley]

Bus?

[5B Steve]

    It's not specifically for the bus , but  one would assume that it would work. knowing what your horsepower is

   it would be intersting to find out the torque at differant RPM'S.

   Thanks for the response.

   Steve 5B......

[Tim Strommen]

HP = (Torque X RPM)/5252

Torque = (HP X 5252)/RPM

RPM = (HP X 5252)/Torque

Torque in foot-pounds by the way...  For those of you who want to do Excel spreadsheets.

Don't forget that Net Torque and Gross Torque are also different.  Net is the Torque available when the engine is tested with all accessories, Gross Torque is just the block with no accessories.  Net torque is what advertisers are required to use nowadays.


-T

[bevans6]

The thing that gets me is the endless debates on the towing/RV forums about how much more important torque is than HP for idling up 20% grades at 90 mph with their house, barn and swimming pool on a trailer behind them.  Torque is a static measurement on a dyno, HP is torque delivered over time to do work.  Basically they are the same thing, an indicator of an ability to do something resembling work...or fun, I guess   

[TomC]

Torque is measured in two different forms.  In a line pulling straight is called foot/pounds.  In rotary or a circle like an engine is called pound/feet.  I know it's splitting hairs, but is done this way to differentiate between linear and circular.  Good Luck, TomC

[JohnEd]

I don't think you have wrapped your arms around it.  Considering all the experience and learning of each of you I have to doubt myself more than just a little(again).

HP is a specific measure of ability to do work.  No matter what gears you use, up or down, that measure for that engine is defined and can't be changed.  A 500HP engine is just that and it will do so much work and not a shred more.

A engine may make 1000 ftlbs of torque but if you gear it 2 to 1 the torque on the shaft will be 2, 000 ft/lbs.  4 times and you get 4,000 ft/lbs.  Double the rpm and you get half the torque.  But HP never changes.  You are just adjusting how much weight you can move in a vertical at what rate of climb.

I hear people marvel at the torque of theirs or a specific engine and comment that it is torque that gets you up the hill.  If that is true then the steam engines would be the most power full engines.  They were the all time torque champs but they produced remarkably little HP.  Torque for one of those was measured at "stall: and it was the pressure per square inch on the drive piston.  If you were running 600 Psi of steam and applied that to a 2 ft diameter piston you would have ? pounds of pressure on the piston?  If you applied that "push" to a rod connected to a shaft you would have that many Ft/ Lbs of torque. No?

In fairness, torque comes in pretty handy in determining how many gears you need to keep the engine in the RPM of max HP.  And if you can get started on that grade.

Am I wrong?  I just cringed at the thought that engineers are reading and responding to this.

John ever hopeful