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).
Centre main bearing loading diagram for a 12HP 4-cylinder engine, showing gas pressure and inertia at 4500 RPM.
| Identifier | ExFiles\Box 115\2\ scan0503 | |
| Date | 26th October 1939 guessed | |
| 12 HP 4 CYL. CENTRE MAIN BEARING LOADING DIAGRAM. TDC ON Nos. 2,3 CYLS. DIAGRAM FOR GAS PRESSURE AND INERTIA AT 4500 RPM. SOLID LINE: 79 % ROTATING MASSES BALANCED DASHED LINE: 90 % ROTATING MASSES BALANCED AXIS LABEL: LBS / SQ. INC, LBS BORE: 2.735 STROKE: 3.75 CONN. ROD: 7.25" WT. OF PISTON RINGS GUDGEON PIN LITTLE END: 1.1 lbs WT. OF BIG END: 0.9 lbs BEARING DIMENSIONS: 2" dia x 1.2" ASSUMED MAX GAS PRESS: 500 lb/in² FIRING ORDER: 1 3 4 2 BDC ON NOS. 2,3 CYLS. | ||