Description
Specifications
The following specifications are for the production engine and its prototypes, known as the model DR-980:[11]
| Type | 4-stroke cycle diesel | |
| Cylinders | 9—static radial configuration | |
| Cooling | Air | |
| Fuel injection | Directly into cylinders at a pressure of 6000 psi | |
| Valves | Poppet type, one per cylinder | |
| Ignition | Compression—glow plugs for starting—air compression 500 psi at 1000° F. | |
| Fuel | Distillate or “furnace oil” | |
| Horsepower | 225 at 1950 rpm | |
| Bore and stroke | 413⁄16 in. × 6 in. | |
| Compression ratio | 16:1—maximum combustion pressure 1500 psi | |
| Displacement | 982 cu in. | |
| Weight | 510 lb without propeller hub | |
| Weight-horsepower ratio | 2.26 lb hp | |
| Where manufactured | U.S.A. | |
| Fuel consumption | .46 lb per hp/hr at full power | |
| Fuel consumption | .40 lb per hp/hr at cruising | |
| Oil consumption | .04 lb per hp/hr | |
| Outside diameter | 4511⁄16 in. | |
| Overall length | 36¾ in. | |
| Optional accessories | Starter—Eclipse electric inertia; 6 volts. Special series no. 7 Generator—Eclipse type G-1; 6 volts |
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| Figure 17.—Longitudinal cross section, Packard diesel engine DR-980. (Smithsonian photo A48845.) | Figure 18.—Transverse cross section, Packard diesel engine DR-980. (Smithsonian photo A48847.) | |
| Figure 19.—Right side view of engine, showing accessories; Packard Motor Car Co. 50-hour test, 1930. A, starter; B, oil filter. (Smithsonian photo A48323.) | Figure 20.—Rear left view of engine, showing accessories, U.S. Navy 50-hour test, 1931. Barrel valve type venturi throttles.A, starter; B, oil filter; C, fuel circulating pump; D, generator. (Smithsonian photo A48324C.) | |
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Operating Cycles
The sequences of operation of a Packard diesel engine compared with those of a 4-stroke cycle gasoline engine are illustrated in figure 21.