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Old 09-01-2010, 08:08 AM   #16
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Propane Mower Conversion


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Originally Posted by homerb View Post
An on demand regulator is the one part I didn't use on this project. Being that I only paid $40 for the mower itself, I wanted to keep it as low budget as possible.

I can extend the runtime on the mower by simply throttling it down a bit. The rpm and mixture auto adjust based on how much propane goes into the mower.

I am interested in using an on demand regulator for my next project, which will need it. I have a generac 7500 w / 13,500 w peak generator that can power my whole house. I haven't converted it to propane yet because I need that on demand regulator. With the mower, I can constantly adjust the propane flow as needed, but the generator needs to be much more reliable, and it needs to auto adjust the flow based on how much stuff I have running in the house.

I haven't even needed to use the generator once since I bought it from the pawn shop for $275, so I don't even know how much gas it uses per hour. But propane is a much better choice because it stores better, doesn't foul plugs, gum up the carb, and extends oil change intervals. Im guessing it'll run for about 4 hours on a typical 20lb tank at half load. Im hoping it'll run longer, if it is to be cost effective though. I could get one of those big 100lb tanks and have it run all day without changing a tank.

What kind of on demand regulator are you planning to use? I've been looking on eBay lately and there are a few different kinds on there.

Homer
Garrettson SD is the ticket, or perhaps the KN with auto-primer. For your generator, you will want one that has an electric shut-off solenoid for positive cut-off when the engine stops. You don't want the engine to shut down and fuel to keep leaking through.

http://www.propane-generators.com/garretson.htm

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Old 09-01-2010, 10:01 AM   #17
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Propane Mower Conversion


What are the other details of your project? In addition to the regulator, what mower are you going to be using? What kind of propane tank?

Are there any other modifications you are making to the mower to make it more powerful or efficient running on propane? Bumping the compression or timing are probably the easiest and most effective modifications you can do.

Post some pics if you can!
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Old 09-16-2010, 11:38 AM   #18
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Propane Mower Conversion


How about the noise factor? I imagine it would be quieter but Im not sure.....
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Old 09-16-2010, 12:01 PM   #19
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Propane Mower Conversion


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How about the noise factor? I imagine it would be quieter but Im not sure.....
It sounds about the same at normal operating RPM. However, since increased the compression ratio and advanced the ignition timing, it sounds a little different. But none of that has to do with the propane directly.

I can make it louder or quieter though...just by adjusting the RPM's with the propane valve.

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