[AT] "older men" and change

[markagreer]

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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