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  #1  
Old 05-13-2013, 07:13 PM
jbell36 jbell36 is offline
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Propane GPH?

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?
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Old 06-13-2013, 10:51 AM
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mrlpg mrlpg is offline
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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
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Old 06-13-2013, 08:32 PM
Weekend cut easymoney Weekend cut easymoney is offline
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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
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2 Sears electric weedeaters
1 green machine electric leaf blower
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Old 06-17-2013, 09:31 PM
Weekend cut easymoney Weekend cut easymoney is offline
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No follow up??
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1989 BlueChevy 1500 Extended cab with FULL bed
1978 7ft Sears cargo trailer with added wood inserts to hold both my weedeaters
3 1976-83 vintage lawnboy lawnmowers with full self propel features as well as mulch kits
2 Sears electric weedeaters
1 green machine electric leaf blower
1 sears articulating hedge trimmer-electric
2 50ft power cords
3 Leaf rakes
1 shovel
1 pocket knife
cooler for beer
lawn chair to enjoy a beer while I wait for the cash to be handed to me
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  #5  
Old 06-18-2013, 12:17 AM
jbell36 jbell36 is offline
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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
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  #6  
Old 06-18-2013, 12:19 AM
jbell36 jbell36 is offline
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9 hours of run time is insane...what machine was it on? HP?
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  #7  
Old 06-28-2013, 10:52 PM
djagusch djagusch is online now
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Quote:
Originally Posted by jbell36 View Post
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?
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.
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