[AT] Greg E, Gene D or anybody - VAC HP bump-up question.

[H. L. Staples]

Farmer not sure about the engine speed changes that may have been made. 

My VAI uses a different gear ratio on the final drive than the VAC.

It seems to have a much higher ground speed for the same gear selection. 
 
The VA parts book list the three different gear sets that were available for
the final drive assembly for this Case series. 
 
 
H. L. Staples
McLoud, Oklahoma
USA
.

 
 
On Wed, Jan 13, 2010 at 7:47 AM, Indiana Robinson
<robinson46176 at gmail.com>wrote:
 
> Are the VAC and VAI engine the same except for the governor setting?
> Did Case bump up the RPM on the VAI for more HP (tractor makers have
> been doing that about forever) or did they think that the VAI would
> be driven more car or truck like rather than running full throttle out
> in a field all day for days on end? Maybe they wanted more ground
> speed?
> The info I have is:
> All agricultural tractors
>                                      No load speed 1600 RPM
>                                      Full load speed 1425 RPM
> VAI Tractor (Industrial)
>                                      No load speed 1925 RPM
>                                      Full load speed 1800 RPM
>               *1425 RPM for proper PTO speed
> Did Case ever use the VAC engine in anything else like a later tractor
> at the higher RPM (like maybe the 300 etc.)?
> My Deere 4020 has a throttle made so that you have a stop at regular
> full speed for normal work and then you pull out on the knob and pull
> it down farther for tough spots or for road use. I think the top speed
> is something like 2500 RPM and the regular setting about 2200 RPM.
> For years I had a tiny cable on my Farmall CUB so that when mowing I
> could pull gently on the cable just as I approached a big clump of
> really tough stuff and get a jump on the rather slow to react
> governor. Once out of the tough patch I would let it drop back to the
> regular full speed. I'm not using it to mow with right now but I
> finally changed the throttle/governor settings so that I had a paint
> mark on about the third notch back and I mowed there 95% of the time
> but could shove it forward 3 notches just in the tough spots (I just
> copied the idea from the 4020).
> I just looked out of curiosity and the Continental on my Ferguson
> TO-20 calls for a no load maximum RPM of 2200 and a loaded RPM of
> 2000.
> Going back over many years the tractor makers have always made a big
> deal about not increasing governor speed settings then a few years
> later when they wanted a little boost the only change they would
> sometimes make was a 200 RPM boost in the high speed setting.
>
> --
> Have you hugged your horses today?
>
> Francis Robinson
> aka "farmer"
> Central Indiana USA
> robinson46176 at gmail.com