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Tractor Talk Discussion Forum

Propane fuel

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Tom in Texas

01-29-2004 06:15:14




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I recently bought an 850 Ford tractor that burns propane. I've never had one before but I think I like it. My question: sometimes when it's cool/cold it won't run on vapor. Anyone have any idea what the temperature range is for running on vapor Vs liquid? What's the fuel consumption difference between liquid and vapor? I live in Wichita Falls Texas. Not really all that cold here but after I warm the engine up using liquid I open the vapor valve and close the liquid valve then engine eventually sputters and quits.

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piston

01-30-2004 03:56:58




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 Re: Propane fuel in reply to Tom in Texas, 01-29-2004 06:15:14  
roger sounds like you know propane system please send me info on getting more out of pulling tractor on pro.what can i do vap. get more gas?



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Roger

01-30-2004 08:25:01




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 Re: Re: Propane fuel in reply to piston, 01-30-2004 03:56:58  
I know just enough to be dangerous. I have run LP tractors and pickups since 1958. I have put 21 pickups on LP that have computers. One mistake doing this and the vehicles computer is history. I haven't made a mistake .....yet. I know very little about pulling tractors. What I do know is the Century M6 or the Impco E Vaporizer is good for 350 hp. You have enough fuel supply with either set up. Tests show that you can get up to 450 - 500 hp. with this equipment. I would think intakes and fuel flow would be the first place to start. In High School it was common practice to put a bigger carburetor on your Hot Rod. The motor would stall or "fall on its face" when you hit the gas. Next was a cam with more lift and duration. This helped but things still weren't right. Finally a better Intake manifold was added. Each item helped and added to the engines HP. When all 3 items were installed and set correctly it all came together and some real HP was made. I always felt the first step in making more HP was Cam Duration. The longer the valves are open the more air and fuel flow you will get. You have enough fuel supply, but you can only shove so much air and fuel through the intake and valves. Just my thoughts.

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Jim

01-29-2004 18:54:14




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 Re: Propane fuel in reply to Tom in Texas, 01-29-2004 06:15:14  
Tom, you are doing it exactly backwards. You should start the tractor on vapor, then switch to liquid after a few minutes when the engine is warmed up. The hot radiator water runs through the vaporizer to heat and evaporate the liquid fuel. If you try to run on vapor, the heat to evaporate the liquid has to come from the remaining liquid in the tank. Since your tank in only about 24 gallons, their just isn't very much of a heat sink to draw upon, and it won't produce enough vapor to run the engine for very long.

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MT Pockets

01-29-2004 13:21:50




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 Re: Propane fuel in reply to Tom in Texas, 01-29-2004 06:15:14  
Tom, this is a subject I know something about. Propane is my favorite fuel for the occasional use tractor. It never goes bad,tank never rusts,and vandals can't contaminate it. And you will never wear the engine out if you just halfway service it. The main drawback is you can't pour gas in it with a five gallon can. If you would care to e-mail me, I'll explain the operational procedure of the tank,valves, vaporizer, and carburetor for you. Thanks. Steve in Texarkana.

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MT Pockets

01-29-2004 15:57:00




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 Re: Re: Propane fuel in reply to MT Pockets, 01-29-2004 13:21:50  
I guess an address would help. Tryts1949@aol.com. Leave Try off. Thanks. Steve in Texarkana.



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twopop

01-29-2004 12:46:54




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 Re: Propane fuel in reply to Tom in Texas, 01-29-2004 06:15:14  
propane will vaporize as long as the outside temp is above -14 butane will not vaporize below 32 degrees



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Roger

01-29-2004 07:03:00




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 Re: Propane fuel in reply to Tom in Texas, 01-29-2004 06:15:14  
The motor will use the same amount of fuel on Vapor or Liquid. The Vaporizer turns the liquid into vapor, so you are really burning vapor all the time. When it gets 30 or 40 dergres and you are pulling the tractor the LP Gas may not vaporize fast enough to keep up with demand. Run on liquid. However, you are in a warmer climate and should not have this problem. The excess flow valve is probably closing and keeping the tractor from running. Start the tractor, run it on vapor. Watch the LP tank. If it "frosts up" on the bottom part of the tank, the fuel is not vaporizing fast enough. If the fuel line from the valve to the vaporizer "frosts up" the excess flow valve is shutting off. Depending on the humidity (high) you will see a lot of frost, if the humidity is low it will be more difficult to see. If the excess flow valve is bad you will need to run the tractor completly out of fuel to change the valve. After you have run it out of fuel, make sure to open a valve (after the engine has cooled) as even a small amount of LP will create pressure. If the valve looks shiny and new it may have been replaced in the last couple of years. Someone may have used a "bottle" valve. In this case the excess flow may be to long. When the valve is installed in the tank, the excess flow will bottom out and close. The original valve will be a Rego with a "Large nut" to hold the valve seat. This valve is larger and bulky compared to the new smaller valves used today. Unfortunatly we don't have any LP Men around anymore. With so many laws and different applications it is easy to get the wrong parts or advice.

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Alvin n Ms.

01-29-2004 06:33:51




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 Re: Propane fuel in reply to Tom in Texas, 01-29-2004 06:15:14  
Tom. I can't understand how the tractor did any serious pulling with just the vapor valve turned on. Propane is a good fuel. The oil and inside of the engine stays a lot cleaner. Sometimes the engines with rotating valves gave problems because there was no lead to lubricate them as they turned. We used propane for years when it was a lot cheaper. alvinnms



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