Quote:
Originally Posted by cdrazic93
Why /5250?
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Quote:
Originally Posted by Calum
It's not something that's pulled out of the air, that is the definition of hp. Every dyno plot you see will have hp=tq at 5252 rpm. Torque is one of two components of horsepower, it's the intensity portion. The rate portion is rpm. In hydraulics those are pressure and flow rate. In electronics they are voltage and current. Every form of energy has those two components, with out either no work can be accomplished.
That's all torque is, a component of horsepower. Useless on its own. Think about it, given a four foot pipe you could generate 400ftlb of torque relatively easily. Could you use that to push a car past 2 mph. Nope, because it's just intensity with almost no rate.
Sent from my samstone
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Horsepower is a rate of work. It is literally define in watts and I remember when I was taking physics in highschool that is was an semi-arbitrary amount chosen as common rate of work that a horse was able to accomplish, if I remember correctly, somewhere about 734 Watts. A Watt is defined in Joules/seconds. A Joule is an amount of work and seconds are a length of time. This means a Watt is defined a work/time.
Now lets think about horsepower. HP is rated in (torque*RPM)/5250. RPMs are a speed with a defined time. In reality, 5250 is 1 minute. Thinking about the units we are applying helps show us their origin. As you can see here, we are getting work/time again. It simply becomes a multiplication factor as we are able to continue doing the same amount of work in less time (which is what revving over 5250 means). I could get into the conversions and how 5250 really came to be, but in all reality, I have neither the desire or dedication to dig up that math and try to write it out in a forum post.