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Many propane conversions result in less than optimum performance because of a lack of information concerning variables and their resultant effect on engine performance, economy, and durability. Factors such as carburetor size, air-fuel ratio, spark advance, air cleaner restriction, exhaust back pressure, intake manifold heat, voltage requirements, spark plug selection and gap, riser height and design, and carburetor orientation are examined to increase the basic understanding of this fuel.

The fuel injection system described here has been developed to meet the needs of potential future developments of passenger car fuel supply. Extensive road testing has demonstrated its ability to perform efficiently at all altitudes, on any engine, and at any operating range. Little or no modification is necessary for adaption to a wide variety of engines, and its no-stall characteristics permit smooth operation under all possible conditions of heat and cold or erratic stops and starts. An extremely important potential development is the control of hydrocarbon exhaust emissions, a project now under way.