JD A rpms?

[buickanddeere]

This message is a reply to an archived post by clampdaddy on July 29, 2012 at 21:42:06.
The original subject was "JD A rpms?".

Any old stock A should spin out in 1st gear on any
track up to 8000lbs.
Every look at the torque curve on stock a two
cylinder? With the short duration cam and small
diameter ports. Torque is rapidly dropping at peak
HP rated rpms.
The first three factors to look after to win when
pulling are. Traction, traction and traction.

 

[Kelly N]

I would have to see my old 1945 John Deere A which is now 125 over bore and much higher compression and also has some port matching, spin out carrying 8000# on snow let alone a good track. I"m usually grinning to hit 5500# and not bog out AND I do NOT use cut tires.
Before the modifications it would only make half the pull it does now.

 

[Anonymous-0]

8000 lbs.? An A wont even move the sled we pull unless it has some aluminum pistons or a creeper gear in 4500 lbs., if it is going to compete it needs a stroker crank also

 

[north puller]

Buick comes from the same pat of the world as i do, and around here, sleds and tracks are designed to stop the tractor due to poor traction. Loose tracks and long chains. My M has a fairly decent 281 engine, and around here on most tracks i will pull 2nd gear in the 5500. I went to a pull earlier this year with an amazing track and a very sort chained sled with a 20" drawbar, and nearly ran out of stream in low gear in the 5000 lb class! I ended up with the win, but it sure opened my eyes to what kind of power you need with a track and sled designed to take power.

No stock stroke A was moving that sled more than 50 feet in a class over 5000 lb.

 

[clampdaddy]

(quoted from post at 13:51:42 07/08/13) 8000 lbs.? An A wont even move the sled we pull unless it has some aluminum pistons or a creeper gear in 4500 lbs., if it is going to compete it needs a stroker crank also

The track in my town is pretty hard and the two times I pulled my A it squatted down pretty good even with 15 psi in the tires and powered out around 145-160 feet. My cousin tells me that if I pulled in the next town to the north it would easily spin out on the softer track. My A is .125 over with gas pistons and I'm running the 108 carb which from what I've read is supposed to be an aftermarket cab for a late A or a G, and I have swapped out the primary reduction gears. This weekend I cut/welded the rockers so hopefully ill gain a little there. I hadn't put a tach on it but to me and most everyone else my tractor never sounded like it was getting up to the rpms it should have. When I bought an old stock G it seemed to wind up quite a bit more than my A did. I'm going to put a tach on it and set it around 1100 rpms and try hooking up to an orchard fan sprayer and see if I can get her dialed in a bit better.

 

[nl00sb]

well wheres the next pull im gonna put 13.6 38 on my farmall cub and come pull it in the 4500 should have enough power

 

[buickanddeere]

Had the factory stock 60 in the 6500lb class on Blyth's sticky clay track. In 1st gear it really wasn't working that hard . Drawbar was short as it would go, 18" high and front end was up.Placed 3rd in that class of 11 tractors so not shabby.

 

[north puller]

Gonna bring that 60 to nnalert? It's the featured tractor this year.

 

[Joe 427]

We have a 1950 JD A with the creeper gear , 90 over gas pistons that we pull in the 7000 lb. class all the time on a rock hard clay track, It has plenty of power

 

[[email protected]]

Around here the chains are so long & useless tracks, we pulled a warmed over late B jd in 6500, 2nd gear, spun out before the governor opened all the way :'(
Ive even spun out in 11,500 with a stock R. I would guess the chain to be around 6 feet long.

 

[buickanddeere]

Don't have that heavy of a truck or trailer for the 6500lb class. would bring the 70 for the 6500lb. The 435 maxes out my truck, trailer and license.. Depends if there is OT at work too. Tough to turn down that kind of $$$. May take the 435 if there is nothing going on.