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 and their weight relative to displacement.
| Identifier | ExFiles\Box 107\4\ scan0055 | |
| Date | 18th February 1924 guessed | |
| WEIGHTS. TOTAL DISPLACEMENT - 190.85 cu.ins. 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) G.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. 17.875 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 R.O.1. and drive) E.52890. 10 5.24 Connecting rod. E.52602. 8.25 4.3 Piston. E.51487. 6.75 3.54 Wheelcase & Fittings. E.52777. 5.31 2.79 Water Pump. E.50234. 4.69 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 | ||