The future Doxford marine oil engine 1

The paper will describe the ideas and objects in the development of the new Doxford engine, to reduce length and weight, to remedy the defects and difficulties which had been experienced with the earlier Doxford Opposed Piston Engine.

The features of the new engine are described and compared where expedient with the earlier engine, the crank-shaft and its design features, the bedplate and main bearings, the connecting rods, piston rods, crossheads, piston heads, transverse beams, cylinder liners, and exhaust belts. The fuel injection and starting air systems are described and also the scavenging pump of the normally aspirated engine.

The turbocharging of the engine is also described and the arrangements adopted on the various multi-cylinder engines. The design features of the turbocharged engine are shown and finally a summary of the test results on the first engine is given.