Average Horse Power

[Mike Rolica]

;) you gotter,  Most of the motors I built were not that high in torque or
hp... like the truck.  But the total area under the graph (or the integral
of the Parametric version of the torque/hp curve is high.. laymen's terms
lotsa torque for a long time.. flat torque curve.  Makes over 400ft-lbs from
2800- 4800.  Since the stock Tpi stops  breathing after 4500, the torque
falls rapidly off at 5200 to 395 then 300 at 5500, the hp is not that high.
Will blow the doors of off a motor with big cam and 500hp at 6000 and 350 at
5200!  Done that!  Now my goal is to extend and bump up the whole torque
curve to 5500 and 500ft-lbs  ...
Any suggestions,  Bruce gave me some hints re the crossfire.  Can't go super
natural as compression is at 11.3:1 right now.  Heads are good for 500 + as
I  built a carp vette motor making 500ft-lb from 3200- 6000.  Weiand intake
and 750 holley/ BG.  Still have some idle problems with 730- conversion when
cold, and spark maps (detonation between shift from 2nd to 3rd)  Any body
play with the low octane option on the 730 anht bin???
Mike Rolica
Meridian Magnesium Products
Strathroy, Ont 
Ext. 260


	-----Original Message-----
	From:	Andrew Wakeling [SMTP:kojab at ar.com.au]
	Sent:	Wednesday, December 15, 1999 3:02 AM
	To:	gmecm at efi332.eng.ohio-state.edu; toyota-mods at cyberauto.com
	Subject:	Average Horse Power

	Hiya all,

	Right, NOW I know why people didn't want to go here... but anyhow,
the
	point I was trying to make, in my ORIGINAL message... before all
this
	stuff was...

	Well, firstly, I DID forget to mention torque, and YES, it does play
a
	significant role in engine performance etc.
	Just for books:

	Torque = Force x Displacment

	OR

	Torque = Force x Distance

	Now, my original proposition, was that... NEITHER maximum Torque nor
	maximum Horsepower matter towards the final quarter of a mile time.
	Here's why...

	Ok, back to the dynometer graphs. If you take a look at a couple of
	graphs from many vehicles from dynos and stuff, you find that it
DOES
	take time to reach the maximum horsepower, and it also must reach it
via
	a certain pathway. Now, this is the key factor... If the graph tends
to
	rise quickly and then reach the maximum horsepower, you'll find the
car
	will perform quite well. If the graph does not a rise for a while,
and
	then reach maximum horsepower, the car will not perform as well as
the
	previous car.

	The final result, is we are dealing with the AREA of the graphs. If
a
	dyno run has a greater area, it will tend to have a greater AVERAGE
of
	horsepower, than a car with a similar horsepower range with a graph
with
	a smaller area. Of course mass also plays a significant role, and
	basically your final result is:

	Constant = Average Horsepower / Mass

	This constant, I reckon, should be the type of constant we should
use,
	instead of "my car produces 500 hp" etc. The dyno runs are fun and
all,
	but seriously, people are learning that they can design cars to
produce
	bigger MAX horsepower by transferring the torque range to a higher
rev
	range, or by other methods such as turbocharging or supercharging,
BUT
	all this added horsepower doesn't relate back to GETTING to that
point,
	or in other words, the AVERAGE performance of a car... which I
believe
	is what we're ALL looking for. I guess that the constant above is
really
	just the quarter a mile times, but without all that slipping and
human
	error. This also assumes that the dyno run was accurate and stuff.

	Anyway, enough of the babble, and back to the garage... just
remember,
	AVERAGE is better than MAX...

	Andrew Wakeling