[DMCForum] Continued: Martin's HP

["content22207" <brobertson@xxxxxxxxxxxx>]

Your original post never once used the word "torque"...

You throw HP numbers around totally out of context (without the RPM's
at which the measurement is taken). Renders them totally worthless.

For example: which is more powerful -- a 200 HP engine or a 400 HP
engine? Stupid question -- without additional info, can't be determined.

Real world example: one of my BONE STOCK UNBUILT 200-220 HP 460's
versus any of the various 400+ HP small bore engines you love to wave
like a flag (none of which sit in YOUR own driveway I hasten to point
out). By the HP numbers alone your small bores ~sound~ twice as
powerful. But can they:
- Accelerate a vehicle weighing TWICE as much as a DeLorean 0-60 MPH
in 8-9 seconds?
- Move FOUR times the weight of a DeLorean (Class III) effortlessly?
Of course not. A small bore is going to be lucky to ever produce much
more than 200 ft lbs of torque, which is the true measure of power.
But HP numbers taken totally out of context will never indicate such.

BTW: Freightliner builds over the road trucks, not railroad equipment.
(I clearly stated such in my first reply). That's why I used them as
an example. Throwing unbased HP numbers around the way you do, a "500
HP" sports car engine should outpull their "400 HP" plants, or so the
uneducated might infer.

Did you notice your last reply inadvertently proved my point? 
-"Torque" is distinct and measureable, irrespective of any other
measurement
- "RPM" is distinct and measureable, irrespective of any other measurement
"Horsepower" is *NOT* distinctly measureable. It can *NOT* be
calculated without *BOTH* torque and RPM

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> wrote:
> Talking bollocks again. How fast will your damn railway engine go?
Speed 
> (rpm) and torque are interchangable in the same way that pressure and 
> flow are in a hydraulic system. With a limited power source, you can 
> trade one off against the other.
> 
> Once again, I'll be happy to have a tug of war with you as long as I
can 
> do it in a long wheelbase landrover defender TDi. (That's a 2.5 
> turbo-diesel with close ratio box)
> 
> http://www.dieselcentre.com/10327.htm
> 
> Martin
> 
> content22207 wrote:
> 
> > At how many RPM's?
> >
> > If that little French wonder car is so powerful, Freightliner had
> > better be quivering in their boots.
> >
> > Uneducated layperson is going to look at your post and assume the
> > Venturi is more powerful than a transfer tracter producing "only" 400
> > HP. Yet it does so in the 1500 RPM range -- more than enough to move
> > 80,000 lbs of over the road freight. Can your wonder car do that?
> >
> > High rev'ing HP is chump change against bottom end HP.
> >
> > Ready for that tractor pull yet?
> >
> > Bill Robertson
> > #5939

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