TEA20 CONVERT TO LPG

I have a reference manual on LP (kind of a bible for LP sellers and installers) and it has a chapter or two on the topic. Most engines need enough fuel that you need a vaporizer so you can take liquid from the tank. I have an Onan standby generator with gas provisions and this book indicates it will take 2 100 pound cylinders to evaporate enough fuel without the vaporizer. I drove a pickup once that was running on propane and until it warmed up it barely ran. My Onan has a pressure regulator that is set to slightly below atmospheric pressure and its outlet is into the venturi of the carbureter. So when the engine is running and gas is available that reduced pressure in the venturi will take in gas. There is a mixture valve to adjust the amount of gas used. I've not yet run it on propane though its previous owner had run it on natural gas for 20 years or more. According to another tractor book I was scanning early this morning, such conversion were popular in the early to mid 50s. Now in the USA except that few LPG tractors were built and thus they are a rare collectable, LP tractors tend to not sell well. Your LP supplier should have information, if not parts for the conversion. My local school district uses propane in their school busses. Since there's no liquid fuel in the engine, there's little crankcase contamination. My Onan crankcase was as clean at age 30 as if new. So oil lasts longer on propane too.

: I have a reference manual on LP (kind of a bible for LP sellers and installers) and it has a chapter or two on the topic. Most engines need enough fuel that you need a vaporizer so you can take liquid from the tank. I have an Onan standby generator with gas provisions and this book indicates it will take 2 100 pound cylinders to evaporate enough fuel without the vaporizer. I drove a pickup once that was running on propane and until it warmed up it barely ran. My Onan has a pressure regulator that is set to slightly below atmospheric pressure and its outlet is into the venturi of the carbureter. So when the engine is running and gas is available that reduced pressure in the venturi will take in gas. There is a mixture valve to adjust the amount of gas used. I've not yet run it on propane though its previous owner had run it on natural gas for 20 years or more. According to another tractor book I was scanning early this morning, such conversion were popular in the early to mid 50s. Now in the USA except that few LPG tractors were built and thus they are a rare collectable, LP tractors tend to not sell well. Your LP supplier should have information, if not parts for the conversion. My local school district uses propane in their school busses. Since there's no liquid fuel in the engine, there's little crankcase contamination. My Onan crankcase was as clean at age 30 as if new. So oil lasts longer on propane too.

: I have a reference manual on LP (kind of a bible for LP sellers and installers) and it has a chapter or two on the topic. Most engines need enough fuel that you need a vaporizer so you can take liquid from the tank. I have an Onan standby generator with gas provisions and this book indicates it will take 2 100 pound cylinders to evaporate enough fuel without the vaporizer. I drove a pickup once that was running on propane and until it warmed up it barely ran. My Onan has a pressure regulator that is set to slightly below atmospheric pressure and its outlet is into the venturi of the carbureter. So when the engine is running and gas is available that reduced pressure in the venturi will take in gas. There is a mixture valve to adjust the amount of gas used. I've not yet run it on propane though its previous owner had run it on natural gas for 20 years or more. According to another tractor book I was scanning early this morning, such conversion were popular in the early to mid 50s. Now in the USA except that few LPG tractors were built and thus they are a rare collectable, LP tractors tend to not sell well. Your LP supplier should have information, if not parts for the conversion. My local school district uses propane in their school busses. Since there's no liquid fuel in the engine, there's little crankcase contamination. My Onan crankcase was as clean at age 30 as if new. So oil lasts longer on propane too.

If a factory LP version was ever offered it will make things easier.
The compression will need to be raised considerably. Many LP tractors
run over 9:1 compression ratios. So either alternate pistons or a different head will be required to get the compression up to a level
where decent power will be produced. LP has less
BTU's per pound than gasoline, thus the change in
compression is required. An LP carburetor, and the associated plumbing hopefully could be salvaged from a factory version
also. My LP 444 also has a vaccuum switch that only allows LP
to flow to the carb when the engine is turning.

Daniel