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).
Technical data sheet for a Lincoln 12 Cylinder engine.
| Identifier | ExFiles\Box 127\2\ scan0024 | |
| Date | 8th September 1933 | |
| TO NS{Norman Scott}/RM{William Robotham - Chief Engineer} from E/WNR X 3929. 8.9 33 LINCOLN 12 CYLINDER - TECHNICAL DATA. -------------------------- 48-1C/R 5-7-1 Wheelbase 145". Bore and Stroke: 3 1/4" x 4 1/2". Horsepower: 50.7 S.A.E. rating. 150 brake horsepower at 3,400 r.p.m. Tyre Size: 7.50-18. Valve Lifts - 11/32 inch. Diameter of Valves: Exhaust and Intake, 2 inches. Valve Stems: Diameter 3/8". Valve Seat: Angle 45°. Carburetor: Stromberg, type D-D- dual down draft. Piston Displacement: 448 cubic inches. Compression Pressure: 103 pounds per square inch. Crankshaft Main Bearings: No.1.-Front. Diameter 2 1/2" Length 1 7/8". 2.-Intermediate. 2 1/2" 1 3/8". 3.-Intermediate. 2 1/2" 1 3/8". 4.-Center. 2 1/2" 2". 5.-Intermediate. 2 1/2" 1-3/8". 6.-Intermediate. 2 1/2" 1-3/8". 7.-Rear. 2 1/2" 3-1/2". Length of Crankshaft: 39 1/4". Length of Main Bearing Surface: 12 5/8", or 32.8 percent total length of crankshaft. Weight of Crankshaft: 93 lbs. Connecting Rod Bearings: Diameter 2 1/8", width 2 1/4". Piston Rings: Four-three 1/8" concentric rings and one 5/32" oil-seal ring, all above the piston pin. Piston Pin: Diameter 7/8", length 3". Length of connecting rods. 11 5/8", center to center. Camshaft Bearings: Eight. No.1. Length 3-1/2" Diameter 1-3/8". 2. 7/8" 2-1/8". 3. 7/8" 2-1/8". 4. 7/8" 2-1/8". 5. 7/8" 2-1/8". 6. 7/8" 2-1/8". 7. 7/8" 2-1/8". 8. 2-9/16" 1-1/4". Timing Chain: Width 1-1/2": 104 links: automatic adjustment. Valve Timing: Inlet opens 21 degrees before top dead center. Inlet closes 47 degrees after bottom dead center. Exhaust opens 57 degrees before bottom dead center. Exhaust closes 11 degrees after top dead center. Ratio Starter to Flywheel: 11:6 to 1. | ||