THE EVALUATION OF THE EFFECT OF PROPYLENE IN PROPANE USED AS A MOTOR FUEL 540185

The results of LPG motor fuel service tests in city busses of the Wichita Transportation Company are given which indicate that the inclusion of appreciable percentages of propylene in LPG motor fuel had no detrimental effects on the operation of city bus engines. Comparison tests between test fuel containing 15 per cent propylene and the fleet LPG motor fuel were conducted in six city busses operated for approximately 25,000 miles each in regular city route service. Evaluation of results in terms of change in Knock-limited spark advance during the test period and visual inspection of combustion chamber deposits were the basis of the conclusion that LPG motor fuels containing 15 per cent propylene afforded wholly satisfactory performance in this city bus service.