[DMCForum] Re: Explaining Horsepower For Jim Strickland AGAIN
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[DMCForum] Re: Explaining Horsepower For Jim Strickland AGAIN



Torque, torque, torque.

Horsepower doesn't even exist without torque (it is one half of the
equation).

A low rev'ing high torque engine will out pull a high rev'ing low
torque engine every time. Absolutley 100% guarantee it.

Some buzzy little engines produce 100 lbs *OR LESS* of torque. Their
HP numbers are totally dependent on rev'ing the ever living mess out
of them. BUT ONCE YOU LOAD THEM DOWN (a trailer, a hill, etc) THEY
CAN'T REV UP! Are then as useless as nipples on a man.

With all due respects, I'm not holding my breath for you and Martin to
engineer a workable transmission to replace Mack tractors with Honda
Civics...

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, Jim Strickland <ihaveanaccount@xxxx>
wrote:
> Time for some new words, bill.
>
> You say that 300 horsepower engine can be more powerful than a different
> 300 horsepower engine.  Obviously you are not measuring how 'powerful'
> something is with horsepower.  What are you measuring?
>
> The car could tow the trailer if geared correctly; the same reason that
> the mack truck with 400hp will never be faster than a 60hp civic. 
>
>
>
> On Mon, 12 Jan 2004 21:22:31 -0000 "content22207"
> <brobertson@xxxx> writes:
> > Andrei, Andrei, Andrei -- don't fall into the HP trap.
> >
> > Horsepower is calculated from 2 numbers: Torque and RPM's. An engine
> > that "only" produces a couple hundred HP, but does so at low RPM's,
> > is
> > MUCH more powerful than an engine rated even higher at high RPM's.
> >
> > Consider a semi trailer tractor. "Only" puts out 300-400 HP. But it
> > does so at 1,500 RPM. Do you suppose your Porsche -- with the same
> > HP
> > rating -- could pull 80,000 lbs as that tractor does? The answer is
> > of
> > course "no" because it would never be able to rev anywhere near its
> > power band (actually it would stall the minute you let the clutch
> > out).
> >
> > Domestic big blocks have tremendous torque -- 3 or 4 times as much
> > as
> > a little sports car engine. That's why you see people towing boats
> > and
> > trailers with a Cadillac, but never a Honda.
> >
> > FYI: HP = Torque x RPM / 5252.
> >
> > The 450 HP rating of your 454 is probably a gross number, calculated
> > out of the vehicle with no accessories on the front. That's the way
> > American manufacturers did it in the 1960s. Actual net HP in the car
> > averaged a hundred ponies or so lower. Domestic manufacturers
> > switched
> > to net HP ratings at the same time they dropped compression ratios
> > --
> > lower compression does lower HP, but not as badly as the 1972
> > numbers
> > make it appear.
> >
> > If you're having problems with the 454 in your boat, consider a Ford
> > 460. I know it's a popular marine application.
> >
> > Bill Robertson
> > #5939
> >
>
>
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