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Propane GPH?

Discussion in 'Alternative Fuel Forum' started by jbell36, May 13, 2013.

  1. jbell36

    jbell36 LawnSite Bronze Member
    from KANSAS
    Posts: 1,258

    we converted two John Deere (Wright) 2013 23.5HP brand new standers this year to Propane...the engines never used gas, they were converted right from the crates...

    we are only getting about 4 hours of run time per 33# bottle...i am told that they fill the bottle up to 80%, which is 7.9 Gallons...

    7.9Gallons/4 Hours is 1.975 GallonsPerHour...to me that doesn't sound very good

    can anyone tell me what they are getting with propane?

    and does anyone know what the equivalent gas engine is getting for GPH?
     
  2. mrlpg

    mrlpg Inactive
    from US
    Posts: 17

    In hearing those numbers, I would say that when the system was converted, proper calibration was not properly performed. It is running too rich. We have seen 9 hour run times on a 33# cylinder that is filled to 80% (7.9 gallons).

    We have seen a comparison that is pretty close. GPH for gas at .6566 and propane .709
     
  3. TX Easymoney

    TX Easymoney LawnSite Platinum Member
    Posts: 4,063

    Kohler just posted today about a new engine they have which runs propane..I asked em about some data so gusy can compare--lets see what he comes up with
     
  4. TX Easymoney

    TX Easymoney LawnSite Platinum Member
    Posts: 4,063

    No follow up??
     
  5. jbell36

    jbell36 LawnSite Bronze Member
    from KANSAS
    Posts: 1,258

    we took our standers in to get re calibrated...they didn't find that anything was out of whack, and only made minor adjustments...didn't see any difference...

    so we slowed the throttle down by simply turning the philips screw on the throttle body...didn't see much of a loss in performance and gained a solid 1.5-2 hours of run time
     
  6. jbell36

    jbell36 LawnSite Bronze Member
    from KANSAS
    Posts: 1,258

    9 hours of run time is insane...what machine was it on? HP?
     
  7. djagusch

    djagusch LawnSite Platinum Member
    from MN
    Posts: 4,161

    If you look at btu's of gas and propane your numbers actually are about correct if the engine gets 1.3 to 1.5 gph on gas (which most would say they get).

    The propane supports say they can get better due to effiencies etc but the math does not lie. Your about right and yes if the rpm goes down it will take less gph (gas or propane). But blade tip speed changes and ground speed changes also.
    Posted via Mobile Device
     

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