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G versus A

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hardscrabble

01-15-2003 16:52:29




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I've noticed in the last Nebraska tests of the A and G, that the difference in belt hp is very small(less than 1 hp). I know the G is supposed to be heavier, with a larger engine. But did the G pull any better than the A out in the field?




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Pappy

01-16-2003 22:59:01




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 Re: G versus A in reply to hardscrabble, 01-15-2003 16:52:29  
We own a gas burning "A" and a "G". G-Man has it correct---exactly.



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Don

01-16-2003 10:34:07




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 Re: G versus A in reply to hardscrabble, 01-15-2003 16:52:29  
I had a brother-in-law, now deceased, who was a JD mechanic for many years. He said a stock 70 JD didn't have any business,in the field, with a hopped up G. The G would walk all over it.



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wallace

01-16-2003 02:07:42




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 Re: G versus A in reply to hardscrabble, 01-15-2003 16:52:29  
the G was designed to be more powerful and pull more than the A just as the B was much smaller than the A...remember the nebraska test were just a TEST, the real test was in the field!



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2 cylinder

01-15-2003 21:05:58




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 Re: G versus A in reply to hardscrabble, 01-15-2003 16:52:29  
The only light I can shed on this subject is that I have both tractors. The JD-A has a powerblock with 6.125 bore (high compression aluminum pistons)with stock stroke, some milling of the head and some porting of the head and intake along with big nut G carb and it dyno's at 55hp. The JD-G has the flat style head, stock stroke and is bored 90 thousands over the 6.125 bore, (high compression aluminum pistons)and it dyno's at 67hp. I tractorpull with both of them and the JD-A won't keep up with the JD-G even on a good day. Just my 2 cents.

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G-MAN

01-15-2003 17:07:57




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 Re: G versus A in reply to hardscrabble, 01-15-2003 16:52:29  
Hardscrabble, the "A" test you're seeing was likely done with a gasoline burning tractor - you might want to go back and look at fuel type. Those later "A"s had higher compression and running on gasoline were very close in horsepower to the "G". The "G" was only ever built as an all-fuel tractor with a lower-compression ratio (although there have been a couple reported that apparently left the factory equipped for burning gasoline). That's why the "A" is able to be so close in horsepower, while only displacing 321 cubic inches to the "G"'s 412.5. It is my understanding that a late "A" would pull with a "G" in good soil conditions, but when the going got tough, the "G" would generally outperform the "A" because of it's larger displacement and greater lugging ability. Deere and other manufacturers offered kits to convert "G"s to more efficiently burn gasoline. These kits generally consisted of higher-compression pistons and cold intake manifolds. Most of the stories I've heard about those kits is that they would put a "G"'s horsepower up to around 50 or 55 pretty easily, which would make them walk away from an gasoline "A" in any soil type, any day of the week.

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