From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Article from 'Automotive Industries' detailing the features and performance of a Diesel engine for a 3-ton Dodge vehicle.
| Identifier | ExFiles\Box 133\3\ scan0019 | |
| Date | 3rd December 1938 | |
| 741 Designed for 3-ton Dodge 24 volts throughout. However, when starting, application of the full voltage is automatically delayed until engagement of the starter pinion is completed. An electric air heater in the intake manifold, equipped with an automatic time-control switch, facilitates starting in cold weather. The engine is of the valve-in-head type, in accordance with general Diesel practice, inlet valves having a port diameter of 1.546 in., exhausts of 1.312 in., and both a lift of 0.375 in. The combustion chamber is located in the cylinder head and is of lemniscate shape, with an auxiliary double “energy cell.” Fuel is injected across the minor axis of the chamber, a considerable portion of the charge entering the “energy cell” through a venturi-shaped passage simultaneously with the entry of air during the compression stroke. Combustion begins in the main chamber, and as a result the cold-weather starting and high-speed-performance characteristics of the engine are said to be on a par with the similar qualities of the direct-injection or open-chamber type of Diesel. But most of the fuel is ignited within the confines of the “energy cell,” and peak pressures, therefore, are kept from the pistons and bearings, while, on the other hand, a high degree of turbulence is produced by the discharge from the cell. Pintle-type nozzles are employed. Incorporated in the fuel-injection pump are means for the automatic control of injection timing in accordance with speed, and for regulation of the maximum injection quantity in accordance with speed. Injection is timed to occur at the optimum point of the cycle at all engine speeds, and this, combined with speed-governed regulation of the quantity of fuel injected per cycle is claimed to give the engine un- Image Captions: Showing details of the combustion chamber A jet of fuel from injection nozzle A enters the “energy cell” B. Combustion starts in the main chamber D, the fine globules in the envelope of the jet igniting first, but some of the core of the fuel jet enters the inner chamber C of the “energy cell” and burns there. Performance curves of Dodge Diesel engine Graph Labels: BRAKE HORSEPOWER TORQUE BRAKE HORSEPOWER FUEL HUNDREDS OF R.P.M. TORQUE-LB.-FT. LB. PER B.H.P. PER HR. Footer: Automotive Industries | ||