gas to propane= power loss

red-in-ok · May 16, 2009

Does anyone now how much or what percentage of horsepower is lost by changing a gas engine to propane?

Anonymous-0 · May 16, 2009

I am going to GUESS 10 or 15 percent. If you do it right and raise the compression a little you will have no loss.

mattofvinings · May 16, 2009

I was going to guess at 15% loss, or 85% of gasoline rated.

Couple nice things with LPG systems (at least the "modern" systems used on forklifts...never any carb or fuel gumming issues, they can sit for 10 years and fire right over).

The engine oil is sooo much cleaner...really impressive.

IMHO the ignition system needs to be in top shape for LPG operation...there's seemingly a lot more water generated during cold operation...could be related to the more complete combustion reaction.

Ozarker · May 16, 2009

The old rule of thumb was 1.2 gal of LP equaled 1 gal of Gasoline equaled .8 gal of Diesel. The technology of both fuels and engines has changed a lot since the 1960's though.

Bob

eurofarmer · May 17, 2009

Hello,
I installed LP in my 1982 Blazer and it is running better then ever before. The oil is clean all the time. Don t think I lost any power, just the milage is down a little bit.

NDS · May 17, 2009

Have run in field with both gasoline and propane Ms. The propane tractors had compression bumped up and timing advanced when they were converted and would run with gasoline tractor all day, maybe a little stronger.

farmalldanzil · May 17, 2009

Here is the BTU's for most fuels.
Propane---91,600
Gasoline---125,000
Ethanol----76,000
Fuel Oil----#2/139,000. #4/145,000. #6/150,000.
You are moved by BTU's
thank Dan. I for got to add per Gal.

teddy52food · May 17, 2009

Propane contains more hydrogen. H + O = H2O (water)

red-in-ok · May 17, 2009

Thanks everyone for the feedback. I think I'm going to go ahead and change it. Since propane smells a lot cleaner than that ol' gasoline exhaust smell. I can live with the power loss.

Owen Aaland · May 18, 2009

The newer liquid propane injection systems will add horsepower to an engine. The propane injected into the intake manifold cools the air so that more can be drawn into the cylinders on the intake stroke. Air temperature at the intake valve can approach -40 degrees under full load conditions. An 8.1L GM engine can gain 15 to 20 HP over the gasoline system.

gas to propane= power loss

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