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).
Comparative table of big end weights and dimensions for various engines.
| Identifier | ExFiles\Box 128\1\ scan0034 | |
| Date | 17th October 1927 guessed | |
| WEIGHT OF BIG END. PIN DIA. * X WIDTH" / 1.3 - .770 lbs. TABLE DATA: HEADERS: ENGINE., Little end wt. lbs., Big end wt. lbs., Dia. of crankpin ins., Width of crankpin ins., Length of rod ins., P = DxW, W = P/1.3 lbs., Ratio calc. wt / measured, error % ROW 1: 1-G-1, .437, .938, 1.500, 1.450, 7.95, 2.175, .900, .96, 4% low ROW 2: G.ll and G.lll., .3638, 1.187, 1.500, 1.500, 7.95, 2.25, .960, .808, 19% low ROW 3: Std. Phantom., .8262, 2.5675, 2.124, 1.850, 11.5, 3.93, 2.255, .845, 15.5% low ROW 4: Lorraine Dietrich., .515, 1.250, 1.771, 1.650, 9.062, 2.92, 1.475, 1.180, 18% high ROW 5: Hispano Suiza., 1.000, 2.625, 2.125, 1.975, 11.8, 4.200, 2.460, .937, 6.3% low ROW 6: Sports Phantom (tubular), .650, 1.970, 1.8735, 2.000, 11.5, 3.75, 2.110, 1.070, 7% high | ||