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 for different engine component sections.
| Identifier | ExFiles\Box 3\2\ 02-page102 | |
| Date | 1st February 1924 guessed | |
| (3) | SECTION | L.O.P. | LBS. WT. | % OF TOTAL ENG: WT: | SECTION | L.O.P. | LBS. WT. | % OF TOTAL ENG: WT: | INCREASE OR SAVING OF WT. ON E.A.U. LBS. | |---|---|---|---|---|---|---|---|---| | Spring Drive. | | 37.25 | 3.95 | Spring drive. | E.17158 | 33 | 4.04 | Increase 4.25 | | Induction and Exhaust pipes | | 38.75 | 4.1 | Ind: pipe. Starting carb. Exh: boxes. | E.22127 E.21030 E.22125 | 25.5 | 4.35 | Increase 3.25 | | Crankshaft Oilers etc. | E.70322 | 75.31 | 8.0 | Crankshaft. | E.17159 | 73 | 8.92 | Increase 2.31 | | Flywheel clutch complete with casing. | | 194.44 | 20.6 | Flywheel & clutch. | C.4465 | 115.06 | 14.1 | Increase 78.38 | | Crankcase and Brgs. | E.71255 | 198.56 | 21.1 | Crankcase & brgs. | E.22057 | 156.5 | 19.15 | Increase 42.0 | | Cyls. with valves, springs, washers, rockers cover, rear cyl, front cyl, cyl head. | E.70903 | 211.75 | 22.4 | Cyls. with valves, springs and washers. | E.22253 | 204.0 | 25.0 | Increase 7.75 | TOTAL ENGINE WT. 940 LBS. INCREASE OF WT. OVER 40/50 HP. 122.5 LBS. TOTAL WT. 817.5 LBS. (with Dynamo) WT. WITHOUT DYNO. 790 LBS. | ||