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A Cummins C8.3 heavy-duty engine has been modified for operation on propane. The engine is spark ignited with a unique combustion chamber design to allow operation at lean mixtures to provide low emissions. The engine uses a dedicated microprocessor control system that provides ignition timing, fuel injection quantity and timing, and engine speed governing functions. The controller also uses adaptive learning to speed up its response. A special turbocharger with integral wastegate gives the required boost and control over its operating range. The engine produces 187 kW at 2100 rpm with low fuel consumption and exhaust emissions. The engine is demonstrated in a heavy-duty truck used for propane delivery. In order to fit a confined engine compartment, the new fuel system was designed to fit into the same envelope as the existing diesel engine.

A Kenworth T800 heavy duty dump truck operating on compressed natural gas has been in service with the city of Surrey, British Columbia. The truck uses a Cummins L-10-300G engine, a dedicated spark ignition engine. Fuel is stored in Dynetek high capacity cylinders, and a data logging system is fitted to monitor performance and fuel consumption of the truck. The truck is used in municipal service moving gravel and asphalt to work sites. A typical day's use is about 200 km. The truck has been modified significantly throughout the project. A stoichiometric natural gas engine has been replaced with a lean burn engine and the fuel capacity has been increased. One of the key findings in the demonstration has been that fueling stations must have their storage sized to the fuel capacity of the largest vehicle in order to allow reasonable refueling times.