Would a better graph be HP or Torque vs. total resistance (rolling
and wind)? Seems the point where they cross would be best MPH for
distance. Works in airplanes, why not RVs? - Tony
--- In Diesel-RVs@yahoogro
<mredsel890@
>
> Maybe I should go back to the beginning?? I will quiet down.
> Russ
> ----- Original Message -----
> From: "Bill Halberstadt" <halberstadt@
> To: <Diesel-RVs@yahoogro
> Sent: Monday, December 31, 2007 8:14 PM
> Subject: [Diesel-RVs] Re: HP/TQ Graph
>
>
> : Yes, I have plotted HP and torque on the same graph. The rest of
your
> : post makes no sense, as we were talking about where the torque
and HP
> : curves cross (and the lack of meaning to that), not where
the "high
> : torque point" is.
> :
> : Bill Halberstadt
> :
> : --- In Diesel-RVs@yahoogro
<mredsel890@
> : wrote:
> : >
> : > I really think you have never plotted RPM curve and torque
curve on
> : the same graph to get
> : > the maximum or "sweet spot". There is only one place, no matter
what
> : numbers you use at
> : > the edge of the graph. RPM will always be the same curve as
far as
> : numbers go, and
> : > torque will always be the same curve using any set of numbers,
no
> : matter what numbers you
> : > use... changing the numbers on the edge of the graph will not
change
> : the high torque point
> : > of an engine.
> : > Happy New Year Anyway.
> : > Russ
> : > ----- Original Message -----
> : > From: "Bill Halberstadt" <halberstadt@
> : > To: <Diesel-RVs@yahoogro
> : > Sent: Monday, December 31, 2007 2:19 PM
> : > Subject: [Diesel-RVs] Re: HP/TQ Graph
> : >
> : >
> : > : Fred is exactly correct. Where the HP and torque curves cross
has no
> : > : meaning whatever. You can make them cross anywhere you want
(or not
> : > : cross at all) by choosing your scales. This is because you are
> : > : plotting two different things which have "RPM" in common for
one axis,
> : > : but do not have the same units on the other axis. Therefore,
the way
> : > : you scale that second axis for each of the two curves
determines the
> : > : scaling (shape) of the two curves independently.
> : > :
> : > : Bill Halberstadt
> : > :
> : > : --- In Diesel-RVs@yahoogro
> : > : >
> : > : > Hi Jim
> : > : >
> : > : > I think the "crossing point" is a function of the scales
chosen by
> : > : the folks
> : > : > that make the graph. I think the more important data is
where the
> : > : "peaks"
> : > : > are located for each curve, and how "flat" the peaks are.
Racing
> : > : engines have
> : > : > sharp peaks and fall off rapidly, whereas engines designed
for
> : > : towing a load
> : > : > have flatter wider peaks.
> : > : >
> : > : > At least, that's what I remember from way back when I took
engine
> : > : design in
> : > : > college!
> : > : >
> : > : > Here's a lot of data showing many auto engine HP vs Torque
Vs RPM
> : > : graphs:
> : > : >
> : > : > _http://www.rri.
> : (http://www.rri.
> : > : >
> : > : > Fred White 02 Windsor, 05 Pilot
> : > : > Polk City, FL & Trenton, ME
> : > : >
> : > : >
> : > : >
> : > : >
> : > : > In a message dated 12/31/2007 9:38:09 A.M. Eastern Standard
Time,
> : > : > jflu653@ writes:
> : > : >
> : > : > Not really sure about big diesels but gas engines all
cross the
> : HP and
> : > : > Torque curves at 5800 rpm. This is a function of the
formula used
> : > : to compute
> : > : > HP using the measured torque at the dyno.
> : > : > Jim & Sally Fluckey
> : > : >
> : > : >
> : > : >
> : > : >
> : > : > ************
recipes
> : > : > (http://food.
NCID=aoltop00030000
> : > : >
> : > : >
> : > : > [Non-text portions of this message have been removed]
> : > : >
> : > :
> : > :
> : > :
> : > :
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> :
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