Propane fill question
OK I am officially confused. I took one of my 40lb. propane cylinders out of my new RV to have it filled. A note on the door of the propane compartment said do not fill over 80%, could cause fire,e...
Forum Discussion
SaltiDawg wrote:RinconVTR wrote:SaltiDawg wrote:
It is my experience that a full 20# propane bottle will produce the same amount of work as 4-5 gallons of gasoline.
And this is impossible FYI. You're talking 1:1 the same energy content LP to Gasoline? Not possible...
Actually you are demonstrating a lack of understanding of Thermal Efficiency considering different fuels and how it relates to fuel efficiency in a small four-cycle engine. You cited a home heating fuel comparison page and compared the available work or heat energy taken from that page for the two fuels on a per gallon basis.
In the case of home heating, the thermal efficiency of an older oil (diesel) is about 80%. On a new condensing furnace using Natural Gas or Liquid Propane thermal efficiencies approaching 95% can be attained.
In a small four-stoke engine you have assumed that the efficiency of that engine using gasoline is the same as using LP. Than telling me that my assertion about in my experience that a 20# bottle is about the same as 4-5 gallons of gasoline is impossible. Let me absolutely assure you that in my experience and that of many, many other posters over in the US Carb forums that approximation is right on.
So, while gasoline does have a higher amount of available energy when compared to LP, the increased engine efficiency tends to mitigate that difference.
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Hey...you can try to talk smart all you want, but you're talking jiberish and strict theory with a whole lot of opinion. NOT REALITY.
One, you've taken a simple chart I posted beyond what it was ever intended to prove and I never once mentioned home heating oil. Stop taking my post so far out of context.
And an LP motor vs equivalent HP gas motor will NEVER run as long on an equal number of "liquid gallons" under the same load. Never. I can show you chart after chart after chart, and also compare my own experience with generators. I'm game to play any time bud. Any. Time.
And the very same situation is currently being play in CNG powered semi's on the road right now. They will never reach the the "MPG" for the sake of simplicity, to diesel. The ROI advantage is CNG right now but its 3-4 years based on the current price of each fuel. That can change over night, but the "MPG" values do not.
Both comparisons are pretty close but will never be equal.
Get. A. Clue.
