Posted by big jt on September 23, 2009 at 09:37:54 from (206.72.54.246):
In Reply to: propane tractors? posted by ryanwheelock on September 23, 2009 at 05:52:35:
I just skimmed the other replies so forgive me if I repeat.
On a proper LP tractor (either complete conversion or factory) there are several things that are different. Of course the tank, carb, and convertor need to be added.
What a lot of people might miss is that you need to raise the compression somehow. Usually done with a different head but sometimes done by using different pistons.
Other thing is the manifold will be different. Reason here is the fuel is vaporized in the convertor using engine coolant. In a gas engine the heat that is needed to vaporize the fuel is added by having the exhaust and intake manifolds connected somehow to transfer some of the exhaust heat over to the intake. Now the reason why they don't just use a regular manifold is the colder the intake air is the more you can pack in the engine. More air/fuel equals more power.
As to horse power I know this is a subject of some debate but if I remember right LP tests better at Nebraska. I know the tests for tractors like my LA case LP is the highest rating of that engine, but the difference is negligible.
As for fueling there are a number of different ways to do that. Main thing you need is a tank with liquid withdrawel. I would suggest a dip tube instead of drawing off the bottom. There is a precipitate in LP that is about the consisitancy of gun grease and stinks to high heaven. Reaks havoc on convertors and carbs also. I have used a line going to the tractor tank and just venting off the vapor in the tractor. This needs to be done with some degree of caution and not a good idea in town. Last I knew hand pumps were still available and I have one I use. Not sure what they cost. Contact your local LP suppier about this setup.
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