The sweet spot on a diesel is where the torque peak is, on my ISL it is 1400
rpm. At that rpm I get my best fuel mileage.
Gerrit (Gary) Van Der Starre
2006 Itasca Horizon 400 ISL
2008 Jeep Wrangler
one dog, one cat, one son and a GREAT wife
Rochester, NY
_____
From: Diesel-RVs@yahoogro
Behalf Of Bill Halberstadt
Sent: Monday, December 31, 2007 11:14 PM
To: Diesel-RVs@yahoogro
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 <mailto:Diesel-
"Russ Waterhouse" <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@
> 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 <mailto:Diesel-
ups.com, FLW300@ wrote:
> : >
> : > 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.
se/index.php?
(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
> : >
> : >
> : >
> : >
> : > ************
> : > (http://food.
<http://food.
aol.com/top-
> : >
> : >
> : > [Non-text portions of this message have been removed]
> : >
> :
> :
> :
> :
> : ------------
> : Off-topic posts will be removed.
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> :
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> :
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> :
> :
> :
> :
>
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