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John Deere Tractors Discussion Forum
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convert all fuel B to gas?

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Lynn Kasdorf

11-09-2004 20:05:37




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I just got this all fuel 1940 B. It is going to take a bit of work to get her going, but not too bad.

I've read that the all fuel tractors have lower compression and hp than the gas versions.

Since I'll likely redo the head, is it possible/difficult/advisable to convert it to a higher compression gas engine? Is it just a matter of a different head, machining the head in some way? Different pistons, what?

Or should I just not worry, and be happy?

I just plan to use this for light work around the hobby-farm, and visitng the neighbors, so the lower hp may not be a big deal. I wonder if there is any sort of fuel that the all fuel engine can burn that is cheaper than gas? Last time I looked, I think Diesel is about the same as gas. Not sure about kero. What about vegetable oil?

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buickanddeere

11-10-2004 18:42:07




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 Re: convert all fuel B to gas? in reply to Lynn Kasdorf, 11-09-2004 20:05:37  
Some people like the "Putt" sound and smell from buring kerosene. As for burning diesel, winter #1 is a stretch at best and #2 should be avoided if possible. With either diesel the engine should be at 210F Sometimes Jet A-1 which is very pure kerosene is rea$onable at your local airport. Burn that stuff at 200+F. If just putting around on gasoline then install the previously mentioned high altiude gasoline or LP style pistons. The hotter all-fuel manifold will help vapourize the air/fuel mixture in a parade tractor. There is suprising amount of power in a cam from Roberts, a dry airfilter conversion, a three angle valve job, port matching, nail head shaping the intake valves and blending the rough spots out of the ports. Not too expensive, not obvious and doesn't "wreck" anything.

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BushogPapa

11-10-2004 08:16:24




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 Re: convert all fuel B to gas? in reply to Lynn Kasdorf, 11-09-2004 20:05:37  
You will be more proud of it, if you do increase the compression....!! I had an "All-Fuel" JD 60 that I bought to take some work off my Late "B"...Heck..the "B" would do anything the All-Fuel 60 would do...!! I sold the 60, and got a 630...!! Get "High Altitude" Pistons if you can... 7:1 compression would be real nice... Original Gas compression was only about 5:1... Be sure to have the valves carefully ground..a 3-angle valve job is much preferred...

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Mike M

11-10-2004 05:03:55




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 Re: convert all fuel B to gas? in reply to Lynn Kasdorf, 11-09-2004 20:05:37  
It may allready be converted. A lot of tractors were. Various companies made pistons,heads,manifolds,and even some kind of drop in compression raiseing inserts back when these tractors were in their hey day.



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Stan - Florida

11-10-2004 04:13:41




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 Re: convert all fuel B to gas? in reply to Lynn Kasdorf, 11-09-2004 20:05:37  
I grew up on a '43 B, which was all-fuel when we got it and was on skeleton steel wheels. We pulled a 1-16" plow and used a 2-row cultivator and a No. 10 John Deere 1-row corn picker.

After WW II, we had it converted to the new "Cylcone" engine which had come out in the late styled tractors (gasoline). Moved up to a 2-12" plow, added 5th and 6th gears and had the wheels cut down and rims and rubber tires put on.

Good old tractor and was our only power on a 215 acre corn/small grain/livestock farm in Indiana from 1943 to 1949 (except for a team of Percherons).

I now have a '41 B and run only 87 octane gasoline in it...it doesn't work very hard, however.

Enjoy your tractor!

Stan Huff
Melbourne, FL

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Will P

11-09-2004 21:05:14




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 Re: convert all fuel B to gas? in reply to Lynn Kasdorf, 11-09-2004 20:05:37  
Oh, also on the HP need that you want. I pull a 1-14" plow in 3rd gear all day long in clay/gravel dirt. It will pull the 2-16" plow but only in 1st and will have problems in hard areas. She is rated for 2-14's though. I have ran our 22"x36" Case thresher with her. Have to feed the thresher alittle slower so she can keep up. Picked corn with a one row PTO Case picker in 3rd gear and ran it just fine. Even with a half full flare box up a hill.

I have only ran gas in her. The higher octane gasses actually are harder to burn. That is why they are less susceptible to pinging in high compression motors. They are also harder to burn in a low compression motors. Run the cheapest, lowest octane rating gas that you can find.

Any other questions, just ask.

Will P

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old

11-09-2004 20:43:04




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 Re: convert all fuel B to gas? in reply to Lynn Kasdorf, 11-09-2004 20:05:37  
I wouldn't worry about it, I run my 1935 B on gas and it does just fine. If I do need a little more pull I mix 50/50 gas diesel and I get a power boost. This old tractor has the same rings in it that my grandfather ran in it some 40 plus years ago and it just keeps popping



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Will P

11-09-2004 20:29:32




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 Re: convert all fuel B to gas? in reply to Lynn Kasdorf, 11-09-2004 20:05:37  
For higher compression. Install different pistons.

My 43B, which is the identical motor to your 40B. Will have the same HP.

My B is running .045 over cast iron low compression "kerosene" pistons. Hot "kerosene" manifold. DLTX34 "kerosene" carb. On 87 octane gas and new rings that had about 2 hours on them. She put out 20.8HP out the PTO on a phrony brake.

Can"t give you hard numbers on a "gasified" B. But a guess would be high 20"s for HP.

Will P

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