Getting performance without sacrificing economy or emissions control in a heavy-duty LPG engine
A commercial 637 CID liquefied petroleum gas (LPG) engine was evaluated as a candidate powerplant for new bus purchases and/or as a replacement for obsolete LPG engines currently being used in metropolitan Chicago bus service. Limited route service experience with LPG conversion of a gasoline engine indicated both its potential and the need for its optimization in order to take advantage of the unique characteristics of LPG. The engine-dynamometer study, with emphasis on fuel system-ignition relationships, led to substantial improvement in fuel economy without depreciation of engine power. The 637 CID LPG engine fuel economy was increased from an average of 1.77 mpg for 1965 to 1971 to 2.60 mpg for the Dec. 1971 to April 1972 period in Chicago field tests. Cylinder head redesign permitted lean mixture operation that reduced exhaust emissions to levels calculated to conform to the 1973 Federal standards and the 1973-1974 California Air Resources Board requirements for heavy-duty engines. The exhaust emissions data obtained with the optimized 7.5:1 CR engine based on the California 13-mode cycle were 8.3 g/bhp/hr carbon monoxide and 9.9 g/bhp/hr hydrocarbons plus nitrogen dioxide.
- OSTI ID:
- 7360576
- Resource Relation:
- Conference: Society of Automotive Engineers, National Combined Farm, construction and industrial machinery and fuels and lubricants meetings, Milwaukee, WI, USA, 10 Sep 1973; Related Information: Paper No. 730803
- Country of Publication:
- United States
- Language:
- English
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Development of Technologies for a High Efficiency, Very Low Emission, Diesel Engine for Light Trucks and Sport Utility Vehicles
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Related Subjects
BUSES
SPARK IGNITION ENGINES
AUTOMOTIVE FUELS
EXHAUST GASES
FUEL ECONOMY
CARBON MONOXIDE
DYNAMOMETERS
FUEL SYSTEMS
HYDROCARBONS
IGNITION
LIQUEFIED PETROLEUM GASES
NITROGEN OXIDES
POWER
TESTING
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ENGINES
FUELS
GASEOUS WASTES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
NATURAL GAS LIQUIDS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
VEHICLES
WASTES
330800* - Emission Control- Alternative Fuels
330101 - Internal Combustion Engines- Spark-Ignition
330701 - Emission Control- Nitrogen Oxides
330702 - Emission Control- Carbon Monoxide
330704 - Emission Control- Hydrocarbons