[AT] "older men" and change

[Stephen Offiler]

I think we're saying the same thing here Mark, mathematically.

What I'm also trying to say is that making an apples-to-apples comparison
between an old engine of known rated HP, and a new engine of known rated
torque, doesn't work because the RPM's are different.


SO


On Fri, Mar 31, 2017 at 1:28 PM, markagreer <markagreer at embarqmail.com>
wrote:

> The formula relies on a torque rating at a corresponding RPM. Without that
> data, HP is pure speculation. "Peak HP" is simply put, the point on the
> torque curve where maximum HP is achieved. Again, you can only calculate
> this at a given torque & corresponding RPM .
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
> -------- Original message --------From: Stephen Offiler <
> soffiler at gmail.com> Date: 3/31/17  12:48 PM  (GMT-05:00) To: Antique
> tractor email discussion group <at at lists.antique-tractor.com> Subject:
> Re: [AT] "older men" and change
> That's the correct formula for HP.  The problem is that it doesn't give you
> *peak* HP.  If you have the inputs to the formula (torque and RPM) then you
> must have plucked them off a spec sheet, and therefore your numbers are
> peak torque and the RPM that it happens to occur, which is typically well
> below the RPM for peak HP.
>
> Here's a link to output curves for Honda GX 390.  Peak HP is at 3600 rpm.
> Peak torque is much lower RPM.
>
> http://www.northerntool.com/images/downloads/charts/6066.pdf
>
>
> SO
>
>
>
>
> On Fri, Mar 31, 2017 at 12:28 PM, Mark Greer <markagreer at embarqmail.com>
> wrote:
>
> > HP = Torque(ft-lbs) x RPM ÷ 5252
> >
> > ----- Original Message -----
> > From: Greg Hass <ghass at m3isp.com>
> > To: at at lists.antique-tractor.com
> > Sent: Thu, 30 Mar 2017 22:02:48 -0400 (EDT)
> > Subject: Re: [AT] "older men" and change
> >
> > I think this is tractor related as it affects much of what we do. My 30
> > year old skid steer has been down for over a year but due to health
> > problems just got to pulling the engine yesterday. It is a Honda 24 hp.
> > engine I put in less than 200 hours ago. At one third throttle it will
> > go through a quart of oil in 5 minutes. I think the seal behind the
> > flywheel came out but have not torn it down yet. Last night just for the
> > heck of it I looked in the northern tool catalog I recently got to see
> > what a new engine would cost. NONE of the engines are listed by
> > horsepower but by cc. and torque. Well I know that means something to
> > somebody but not me. I have better things to do (a nap comes to mind)
> > than try and convert those figures. Also, I'm not sure of conversions;
> > for instance, my Farmall Cub is rated at 10 hp. and is a c60 running at
> > 1800 RPM. The Cub power unit on our IH 64 combine was also a c60 but ran
> > at 2900 RPM giving it about 18 hp. so I'm not sure you can go by
> > displacement. HP rating have worked for a hundred years why change now.
> > Call on a new tractor and they will give you engine horse; that may be
> > all and good but only drawbar horse will tell me how many plows I can
> > pull. A couple of years ago my brother bought a 10,000 watt generator.
> > He got it home a fueled it up and was test running it when he happened
> > to glance at the box it came in. In big letters it said 10,000 watts,
> > but in small print under that it said starting watts. Also in small
> > print it said 8000 watts running. Turns out when the salesman was
> > showing the forklift driver which generator to load he just looked at
> > the top number and took that one . My brother had already used it so now
> > he is stuck. Have we reached the point where all people can do is
> > deceive us?  Old man rant over.
> >          Greg Hass
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