[AT] "older men" and change

[Stephen Offiler]

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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