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).
Weight comparison table of components between the E.A.C. Engine and the 40/50 Engine.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan100 | |
| Date | 25th January 1924 guessed | |
| (2) E.A.C. ENGINE 40/50 ENGINE. E.A.C. ENGINE TABLE SECTION, L.O.P., LBS. WEIGHT, % OF TOTAL ENG. WT Dist: Drive., , 4.0, .42 Water pump drive., E.71152, 4.75, .5 Water pump., E.70527, 6.44, .69 Oil pump and Filter., , 5.6, .6 Wheelcase and Fitts:, E.70952, 8.75, .92 Carburetter., , 10.25, 1.09 Mag. & Drive., , 15.37, 1.63 Piston., E.70511, 15.62, 1.72 Camshaft brgs. Wheel comp:, , 17.12, 1.82 Connecting rods., E.70447, 17.16, 1.83 Tappets and Guides, push rods, rockers shafts &, , 25.62, 2.72 Dynamo., , 31, 3.3 40/50 ENGINE TABLE SECTION, L.O.P, LBS WT., % OF TOTAL ENG:WT., INCREASE OR SAVING OF WT. ON E.A.C. LBS. Water pump., , 8.5, 1.03, Saved 2.16 Wheelcase and Fitts., , 8.56, 1.04, Increase .2 Carburetter., , 19.75, 2.42, Increase 9.5 Wtr. Conn: to Thermo-stat)less str. pipe to rad:, E.22116, 13.75, 1.7, Mag. & Drive., E.19475, 16.5, 2.27, Saving 3.13 Piston., E.20562, 16.51, 2.02, Saving .98 Camshaft., E.17158, 16.62, 2.03, Increase .5 Conn: Rods., E.17160, 20.06, 2.5, Saving 2.9 Tappets etc., E.22771, 15.0, 1.84, Increase 5.62 Dynamo., , 27.5, 3.4, Increase 3.5 | ||