Quote:
Originally Posted by Hersbird
I bought a 1996 Chevy Silverado one ton crew cab that had the 7.4 Vortec and a propane dual fuel conversion with a 115 gallon tank in the bed. I also had a 1988 Southwind motorhome that was a 454 with dual fuel propane and unlead.
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Propane is different from CNG, not just because CNG is methane-based but, most important, because of its storage pressure. While CNG usually goes from 3000 to 3600psi, propane (a.k.a. LPG, liquid petroleum gas) is stored at 225psi. Some propane conversions have a heating system to regasify the liquid propane, while others still use it in the liquid phase (forklifts usually go this way), while CNG is always in gaseous phase altough it must be de-pressurized before it's admitted into the engine. There is also the LNG (Liquid Natural Gas) but it's a totally different animal, requiring cryogenic storage to be kept in liquid phase, and can't be used in an engine in liquid phase.