Abstract: An exhaust system for a two-cycle internal combustion engine combusting a normally gaseous hydrocarbon as fuel, the engine having a cylinder having an exhaust port in communication with an exhaust manifold. The exhaust system has an exhaust gas inlet connectable to the exhaust manifold of the internal combustion engine and an exhaust gas outlet spaced from the exhaust gas inlet in the direction of flow of exhaust gas through the system. A first tubular portion is disposed between the exhaust gas inlet and outlet, the first tubular portion diverging in the direction of flow. A second tubular portion is disposed between the exhaust gas inlet and outlet and spaced from the first tubular portion in the direction of flow, the second tubular portion converging in the direction of flow.

Abstract: An exhaust system for a two-cycle internal combustion engine combusting a normally gaseous hydrocarbon as fuel, the engine comprising a cylinder having an exhaust port in communication with an exhaust manifold. The exhaust system comprises an exhaust gas inlet connectable to the exhaust manifold of the internal combustion engine and an exhaust gas outlet spaced from the exhaust gas inlet in the direction of flow of exhaust gas through the system. A first tubular portion is disposed between the exhaust gas inlet and outlet, the first tubular portion diverging in the direction of flow. A second tubular portion is disposed between the exhaust gas inlet and outlet and spaced from the first tubular portion in the direction of flow, the second tubular portion converging in the direction of flow.

Abstract: A fuel supply system is provided for an internal combustion engine. The system comprises a fuel control valve metering fuel to the inlet of the engine and a governor for monitoring the output of the engine and adjusting the fuel control valve. A first fuel of low quality is fed to the inlet of the engine through a first valve regulating the supply of the first fuel. A fuel mixture controller responds to output signals from the governor and adjusts the position of a second valve for regulating the supply of a second fuel of high quality. The first and second fuels are combined in a mixture before being fed to the fuel control valve and the inlet of the engine.