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John Deere Tractors Discussion Forum
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"G" distillate vs. gas horsepower?

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10-10-2013 15:21:07

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We all know that the G was rated at around 36 horsepower. I assume that since it was sold as a burner of cheaper heavy fuels, that is probably what mother Deere used when they came up with that horsepower figure. Does anyone know what (if any) horsepower difference there was when the tractor was fed gasoline with no other modifications made to the engine?

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10-17-2013 05:16:14

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 Re: in reply to clampdaddy, 10-10-2013 15:21:07  
I have used a stock "G" in several different conditions. The best performance I got was a 50/50 mix gas and kerosene. Diesel fuel performed ok, however, if the tractor ever pulls down it takes a long time for the RPM"s to come back up. With a change to Alum higher compression pistons and manifold change the "G" is a different tractor I believe 50HP would be conservative.

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10-11-2013 21:08:59

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 Re: Re: in reply to bigboreG, 10-10-2013 15:21:07  
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Sure wish a previous owner would have spent the money so I wouldn't have to. Lol!

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10-10-2013 18:17:57

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 Re: in reply to clampdaddy, 10-10-2013 15:21:07  
What causes the relatively low power on a G is the engine's low compression ratio required to handle distillate fuels. Running on gasoline will make little, if any, difference in power unless the compression ratio is increased.

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10-10-2013 17:08:09

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 Re: in reply to clampdaddy, 10-10-2013 15:21:07  
There doesn't seem to be any documents reporting horsepower on gasoline vs distillate in the Nebraska tests conducted on the "G". Nebraska test #295 reported 35.91 maximum observed belt HP, 36.99 HP corrected to standard atmospheric conditions.
It's not like Deere "came up with" HP numbers in the late 30's when outside testing was done.
In pulling a plow with the G's we had, I don't remember any difference in power worth talking about.
Consumption, yes; Power, no.

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Kent Petersen

10-11-2013 03:10:48

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 Re: Re: in reply to PopinJohn, 10-10-2013 17:08:09  
There would not be any data on gas Gs because Deere never made any. gas pistons and manifold came out as parts from deere near the end of G productsion a good G with the gas conv. would put out About 50 to 55 hp

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10-11-2013 08:17:13

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 Re: Re: in reply to Kent Petersen, 10-11-2013 03:10:48  
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Yeah, just curious if anybody ever tried dyno'ing a bone stock G while running it on gas. Once I get the clutch parts for mine to get it mobile I was thinking about pulling it once before I swap out the pistons, just for fun. Just wondering if I should run it on gasoline or if I should buy a couple gallons of kerosene.

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mike m

10-11-2013 17:00:28

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 Re: Re: in reply to clampdaddy, 10-11-2013 08:17:13  
I bet very few stock ones around. Many had the flat head added to boost power.

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Mike M

10-11-2013 05:55:22

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 Re: Re: in reply to Kent Petersen, 10-11-2013 03:10:48  
Those figures are right in line with what I dynoed a late G at that was overhauled and the only modification was to install gas alum. pistons. Nothing wild just so it would still run on cheap pump gas.

And as to the gas verses all-fuel when stock on my 1946 A as I was in the middle of the field plowing I switched from gas to kerosene or vice versa ? and the only differance I could tell was the smell of the exhaust.

And just for curiosity on my 1945 B which was upgraded to .045 over JD cast iron gas pistons I tried kerosene in it. When first switched it seemed to sit there and run fine,but the slightest load like trying to move or move up a very slight slope and the KNOCKING came on strong ! I didn't do that for long ! and don't recommend any one else try it !!!!

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