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).
Table comparing the weights of various engine components per 100 cubic inches of displacement.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan40 | |
| Date | 12th July 1923 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. DISPL: | WT. EAC. PER 100 CU.INS. DISPL | |-----------------------------|-----------------------------------|----------------------------------|--------------------------------| | 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. | 201 lbs. | | ||