[Diy_efi] Area under torque curve?

[Alexander Guy]

On Fri, Jan 03, 2003 at 12:09:26PM -0800, Derek wrote:
> 
> So let me try your question now -
> X = torque = force x distance
> Y = revs/time
> Area under = force x distance x revs / time
>            = force x distance / time (since revs are dimensionless)
>            = "lb.ft. per sec" for instance
>            = "rate of doing work"
>            =  POWER - I think! - correct me if I'm wrong.
> 
> Not exactly "How fast the car is" - but much the same meaning after a
> couple of beers.

But revs aren't dimensionless, right?  Integrating RPMs (i.e. X = time,
and Y = RPMs) you're going to get the distance the engine rotated over time.
In this case, since you're dealing w/ horse power:

    HP = lb.ft * RPM
         -----------
	    5252.1

So wouldn't you want your final integration to be:

	X = lb.ft
	Y = revs/tmp

... w/ the appropriate scaling, in order to get the total power outputted?  If 
I had realized what I'd be using calculus for when I was 17, I probably would
have paid more attention.


Alexander


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