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 deg. F.
Fuel Distillate or "furnace oil"
Horsepower 225 at 1950 rpm
Bore and stroke 4-13/16 in. x 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 45-11/16 in.
Overall length 36-3/4 in.
Optional accessories Starter--Eclipse electric inertia; 6 volts.
Special series no. 7
Generator--Eclipse type G-1; 6 volts
[Illustration: Figure 17.--Longitudinal cross section, Packard diesel
engine DR-980. (Smithsonian photo A48845.)]
[Illustration: Figure 18.--Transverse cross section, Packard diesel
engine DR-980. (Smithsonian photo A48847.)]
[Illustration: 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.)]
[Illustration: 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.)]