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Discussion Starter · #1 ·
I saw this J-20 on Ebay that can run on either Propane or Gas. Anybody ever done this, Ive never heard of it just curious how well it worked and what all is involved /ubbthreads/images/graemlins/confused.gif
 

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This is a really common conversion amoung the farming community. I've never had any real experience with it but my father modified a couple of cars in the 80's that could run off propane and gas at the same time. Just a matter of running plumbing to the carb and setting the mixture right. Propane burns hotter and cleaner than gas, if I remember right there was a question as to wether or not it would damage the pistons over time, but I think that was over quite a few miles (tens of thousands).
 

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Discussion Starter · #3 ·
Interesting.....its a wonder you dont hear more of this with gas prices going through the roof
 

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A lot of the deisel guys are starting to do this, more power and better fuel economy.

Of course with any mod for fuel economy purposes you have to weigh the initial cost of the mod vs the amount of $$ saved in fuel. I know I can buy gas @ $2.49 and propane @ $1.50. That saving could add up quick, but most places are now adding road taxes if the propane is being used for powering up a motor vehicle vice being used to heat a home or in an RV or something like that.
 

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Discussion Starter · #7 ·
I knew you were able to use propane in a vehicle but just never heard of being able to switch from gas to propane, Ive heard of disels using both but not a gas engine

Here locally (hosier gas) sells propane for 1.25/gallon and gasoline here in indy is about 2.30/gallon
 

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Some good info here.

"Costs

See the current model year light-duty vehicle and heavy-duty vehicle lists for costs of new propane vehicles offered by the auto manufacturers.

Factory-installed light-duty truck conversion costs about $2,500 over the conventional vehicle base price; non-factory conversions also average about $2,500.

Performance

Propane vehicle power, acceleration, and cruising speed are similar to those of gasoline-powered vehicles.

The range for bi-fuel vehicles is comparable to that of gasoline vehicles, but the range of dedicated propane vehicles is generally less than gasoline vehicles because of the lower energy content of propane. (Propane contains about 84,000 Btu/gallon and regular gasoline averages 114,000 Btu/gallon.) Extra storage tanks can increase range, but the additional weight may displace some payload capacity. "
 

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You generally lose some power on a gas to propane conversion unless the compression ratio is increased to take advantage of the higher antiknock properties of propane. Those conversions were very common here in Manitoba in the 80's among fleet vehicles and many taxi cabs still run propane. They used to convert new trucks where I used to work, and they seemed to have less power after the conversion.
 

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[ QUOTE ]
So would the mileage stay the same???

[/ QUOTE ]

From what I understand you get fewer miles/gal on propane than on gas.

just my 2 cents.
 

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The parts are available on E-bay. They used to be cheap but the prices are climbing. It still looks like a cheap DIY conversion - would be a cool beater project. I researched this a lot after seeing a conversion done in one of the Jeep rags last year but then I lost interest. You can use fork lift tanks and get about the same distance as your standard gas tank according to some of the info I've read. It is cleaner burning and naturally odorless. The smell that you smell is added so that it can be detected more easily. It is off camber (drive upside down) friendly like FI.

Anyway - its in the back of my mind to give it a go some day.
 

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maybe wbcarver will see this thread and put his 2¢ in on it. He used to manage a fleet of Propane/Gas trucks.
 

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You also have to make sure you are purchasing propane that has the "hiway use" tax added. Major fines if you get caught running fuel that does not have the tax added to the purchase price. In NC you can get a form that you log each gallon of alternative fuel (propane, bio-diesel, methane...) used and pay the tax at the end of the year directly to the state...
 

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And each state has different tax incentive programs for alternative fuels. For example, Maryland gives you half back for the first year but I know people that are still getting the rebate after a year. You file it right on your income tax forms. If, you use Turbo Tax, it walks you through it.

The Fed may have separate programs as well. For bio-diesel the Fed is giving $1.00 back to the blender (me) that I can use to discount my selling price and then the half back from the state makes things real attractive to the end user... $1.50 a gallon average realized after all is said and done based on today's numbers. The down side is that the Fed has been slow about getting the buck back to the blender. The program started January 1, 2005. It's the first of August and we ain't seen squat. /ubbthreads/images/graemlins/bs.gif
 

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Another thing I'd heard about running propane was the crankcase oil stayed cleaner longer with less loss of viscosity. This was due to less hydro carbon blow by during combustion. This blow by mixes with crankcase oils, in particular the sulphides, to create corrosives. Those same sulphides in the atomosphere create acid rain. I had a friend that ran a Ford Aerostar van on propane with dealer installed conversion for over 400k miles last I'd seen him.
 

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It isn't less blowby, it is because there is no liquid fuel to stick to the cylinder and get past the rings.
 

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The products of combustion are so much cleaner when you burn propane due to its composition, a short 3 carbon chain. You don't get that telltale yellow flame and soot during incomplete combustion like you do with gasoline. That plays a major role in keeping the oil free of black stuff.

Here's some basic info on propane:

http://www.weldingsupply.net/propane.htm
 
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