[AJD] Two Cylinders and Power Driven Equipment

[Frank]

one  must wonder why Deere stayed in business so long all all the others are 
gone?


Frank
gremaux at midrivers.com
----- Original Message ----- 
From: "E. M. THATCHER" <ethatche at hotmail.com>
To: <antique-johndeere at lists.antique-tractor.com>
Sent: Saturday, February 09, 2008 11:30 AM
Subject: [AJD] Two Cylinders and Power Driven Equipment


> It's been awhile since I commented on any of the online discussions.  I 
> used to be pretty regular here until about four years ago.  Just retired 
> last month so I have a little more time on my hands although not much as 
> it turns out.  Guess I'm somewhat qualified to comment with over 50 years 
> experience owning and operating two cylinder Deere's and their 
> multi-cylinder counterparts.  From my experience and that of my Dad it 
> seemed to us that power driven equipment performed better behind 
> multi-cylinder tractors than behind the two cylinder Deere's that we 
> owned.  That's not to say combines and pickers didn't work or experience 
> more breakdowns when powered by  a two cylinder Deere but some implements 
> (combines in particular) worked better with other tractors.  The perceived 
> smoother delivery of power may have been a factor although I also agree 
> that the heavy flywheel on the JD's should have effectively cancelled out 
> the two-cylinder pulses.  I attributed the difference to what!
> ever slight gearing advantage the multi-cylinder tractors had in order to 
> achieve the standard 540 rpm 'pto output.  An "A" running at 975 rpm's is 
> not going to have as much gear reduction to achieve the 540 rpm pto speed 
> and therefore mechanical advantage at the pto as an International "M" or 
> Minneapolis Moline "U" running at 1300 rpm's or so.
>
> The same would seem also apply to belt drive equipment.  The Deere was 
> running directly off the end of the crankshaft (model "H" and vertical 
> twins excepted)  while counterparts probably for the most part enjoyed 
> some level of reduction from the engine to the pulley.  Much of that may 
> have been nullified however, by varying pulley diameters to achieve the 
> proper belt speed to drive separators, hammer mills, saws, etc.  Something 
> to think about anyway.  Maybe you guys already have the answer.  What are 
> your thoughts?
>
> On another note... If I can successfully upload it,  I have a short video 
> originally filmed in 8mm of my Dad combining wheat in 1958 with a 49 JD 
> "A" running a JD 25 combine.  Too bad there isn't any sound.  The "A" 
> powering the Model 25 through a good stand of winter wheat was (and is) a 
> total sensory experience.
>
> Eric Thatcher
>
> St. Peters, MO
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