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Dual-Fuel CNG and Diesel


Some heavy-duty vehicles use spark-ignited natural gas systems, with a lower torque rating for a given engine displacement than a high-pressure direct injection engines that burns natural gas in a compression-ignition (Diesel) cycle, where diesel fuel is injected into the combustion chamber along with the natural gas. Diesel ignites when the piston nears top dead center (highest pressure) and this combustion ignites the natural gas. As in spark-ignited engines, expanding gases in a compression-ignition engine produce mechanical energy in the form of rotational forces that propel the vehicle.
