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 65\4\ scan0219 | |
| Date | 29th February 1928 guessed | |
| WEIGHT OF BIG END. PIN DIA. "X WIDTH" - .770 lbs. 1.3 | 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 - .770 lbs. | Ratio calc. wt measured | error % | |---|---|---|---|---|---|---|---|---|---| | 1-G-1 | .437 | .938 | 1.500 | 1.450 | 7.95 | 2.175 | .900 | .96 | 4% low | | G.11 and G.111. | .3638 | 1.187 | 1.500 | 1.500 | 7.95 | 2.25 | .960 | .808 | 19% low | | Std. Phantom. | .8262 | 2.5675 | 2.124 | 1.850 | 11.5 | 3.93 | 2.255 | .845 | 15.5% low | | Lorraine Dietrich. | .515 | 1.250 | 1.771 | 1.650 | 9.062 | 2.92 | 1.475 | 1.180 | 18% high | | Hispano Suiza. | 1.000 | 2.825 | 2.125 | 1.975 | 11.8 | 4.200 | 2.460 | .937 | 6.3% low | | Sports Phantom (tubular) | .650 | 1.970 | 1.8735 | 2.000 | 11.5 | 3.75 | 2.110 | 1.070 | 7% high | | ||