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 listing the weights of various engine components in lbs and per 100 cubic inches displacement.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan38 | |
| Date | 2nd February 1924 guessed | |
| WEIGHTS. TOTAL DISPLACEMENT - 190.85 cu.ins. | G.11. Weights to L.O.P's. | Weight lbs. | Wt/100 cu.ins. displacement. | |---|---|---| | Cylinders with valves etc. E.52720 | 134.69 | 70.6 | | Crankcase & Bearings. E.52244. | 124.375 | 65.4 | | Flywheel and clutch. | 100 | 52.4 | | Gearbox (complete) E.51300. | 79.5 | 41.65 | | Crankshaft. E.50218. | 29.37 | 16.4 | | Dynamo Drive E.51525 Dynamo D.51096. | 25.438 | 13.33 | | Starter Motor and Bendix Drive. D.50907. | 21 | 11 | | Inlet. E.51767. Exhaust pipes E.51605. | 17.375 | 9.36 | | Spring drive. | 15.69 | 8.23 | | Tappets and fittings. E.51951. ( and washers - no springs). | 13.25 | 6.95 | | Carburetter. E.51367 | 10.5 | 5.51 | | Camshaft. E.50554. | 10.062 | 5.3 | | Magneto (Watford M.O.L. and drive) E.52890. | 10 | 5.24 | | Connecting Rod. E.52602. | 8.25 | 4.3 | | Piston. E.51487. | 6.75 | 3.54 | | Wheelcase & Fitts. E.52777. | 5.31 | 2.79 | | Water Pump. E.50234. | 4.89 | 2.46 | | Governor Drive. E.50880. | 4.75 | 2.49 | | Dist. & Wtr.Pump Drive. E.80308. | 3.125 | 1.64 | | Oil pump. E.50303 | 3.06 | 1.602 | | Controls. E.52926. | 2.625 | 1.375 | | Idler gear. E.50077. | 2.25 | 1.180 | | Wiring. E.52927. | 1.69 | .886 | | ||