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).
Comparative table of weights for portions of different engine models per 100 cubic inches of displacement.
| Identifier | ExFiles\Box 107\4\ scan0057 | |
| Date | 18th February 1924 guessed | |
| COMPARATIVE WEIGHTS OF HEAVIEST PORTIONS OF RR. ENGINES PER 100 CU. INS. DISPLACEMENT. DESCRIPTION OF PART. WT. 20 HP. PER 100 CU.INS.DISPL: WT. 40/50. PER 100 CU.INS.DIS: WT. EAU. PER 100 CU.INS.DIS: Induction and Exhaust pipes. 9.36 5.6 8.28 Crankshaft Oilers etc. 16.4 16.1 16.1 Flywheel and Clutch. 52.4 25.4 41.4 Crankcase and Bearings. 65.4 34.4 42.4 Cylinder Block and Head. 70.6 45.0 45.1 Whole engine with dynamo. 293 lbs. 180 lbs. 301 lbs. [Faint watermark text across center: ROLLS-ROYCE] [Faint watermark text at bottom: MADE AT CROXLEY] | ||