Learning alot about propane conversions

Discussion in 'Alternative Fuel Forum' started by jonathanone, Jan 29, 2011.

  1. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 12,965

    Well my unit is up and running now I can start collecting some information. I had to get some help since that governor shaft had to be modified to go around the gas inlet tube. Had to have expert to do that. Bottom line a lot more to this than just strapping on some parts. It sure does seem to have more power but maybe that is partly because they adjusted the top speed. Now I am ready for the leaves. No more stalling when the right side of the
    machine is high or going over bumps. And should fix the cold warm ups necessary with gas. It ain't pretty but was cheap.....I always go for cheap over beauty. Now maybe we move on to get our trucks converted. Kinda hard decision now that gas is rocketing down.

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  2. c2weech

    c2weech LawnSite Member
    Posts: 62

    ed2hess the conversion looks good. is that from a kit if so what company or is it through parts that you pieced together? Also what was the cost?

    is this your first propane mower?
     
  3. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 12,965

    No it isn't a kit I begged some parts but had about $300 for the carb, regulator, and switch. Dealer provided probably another $100 worth of fittings, and hoses and some weld work. It is the third unit we have a sentar, a turf tiger on propane.

    I just put a short block in this unit it has 2000 hours and I am going
    thru it and changing out bearings etc etc. Got a little extra time
    these days since no mowing.
     
  4. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 12,965

    I don't work out of a backyard.....and if we decide to put propane on our diesel trucks I will let a professional do it. But not on a six year old machine...And by the way I had a guy looking over my shoulder all the way that is probably one of the best propane install guys around. So what is your point?
     
  5. djagusch

    djagusch LawnSite Platinum Member
    from MN
    Posts: 4,171

    For the bold it would need to be a fuel related failure to deny warranty (to lean or rich). If a lower end bearing goes out it would still be covered unless the mfg can prove the conversion caused it. That is the law.

    For the red what distributors for factory units? Pace for Scags? Or your propane mowers on your site.

    The only thing Ed is missing is an exhaust analyzer to make sure it is running properly. Plug readings, and checking exhaust temps could also make sure it is running right. He got the carb from Kohler directly so it should be pretty close from the get go.
     
  6. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 12,965

    You got me curious.......since I didn't do any of the above except
    rpm what do I need to do? The machine wouldn't start after a couple days so I opened the adjusting screw that has a lock nut about 1 and 1/2 turn. It now starts and runs fine at idle and under heavy load. There is an idle screw and a run screw that is caped so I didn't touch neither. Should I expect this propane to run hotter than gas?

    This machine isn't being used much so ......I got time to take it back
    in to the shop. And to Terry I understand. I need to get more information.
     
  7. djagusch

    djagusch LawnSite Platinum Member
    from MN
    Posts: 4,171

    EGT will let you know if the engine is running too hot. Running the engine rich won't wreck it. Running it too lean will melt stuff/expand pistons enough to wreck the cylinders, etc. It should show a lean misfire but if it is right before that point it could seem to work fine but causing damage. Knowing where it was before and after the conversion would be good to compare.
     
  8. djagusch

    djagusch LawnSite Platinum Member
    from MN
    Posts: 4,171

    The exhaust analzyer is what you want to do if you can. Any motorcycle shop with a dyno should have one. A university in your area may have one also. If you have a ATV shop with a dyno that would be best as the mower can go on it directly.

    I'm fortunate enough to have a Polaris project manager as a friend (with a ME degree) and another friend doing emissions research (also ME degree) with the tools (even a atv dyno) needed to check it on a weekend or evening.
     
  9. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 12,965

    Reg is a Beam Model T60...I know about the pin and it is correct.
     
  10. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 12,965

    Actually Jimmy worked with me finishing the connections a few weeks ago. I train at that shop every other week so I can do the repair on our equipment in the field. I will take it bye when I get a chance I was trying to get some feedback to get it started the next morning. I figured out which one to get a little more gas and it started but will drop if bye for him to check it. Thanks
    I don't plan to get certified.
     

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