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).
Specification table detailing the dimensions of crankshafts for various engine models.
| Identifier | ExFiles\Box 128\1\ scan0032 | |
| Date | 11th October 1927 guessed | |
| X3531 CRANKSHAFT DETAILS. X8010 X5010 | Engine. Part No. | Phantom E.75216 | Sports Phantom. E.76546. | 1-G-1. E.18881. | Std. 20 HP. E.54064. | Stiffer 20 HP. E.51976. | India 111. LeC.2480 | |---|---|---|---|---|---|---| | No. of brgs. | 7 | 7 | 7 | 7 | 7 | 7 | | Outer dia. | 2.6245 | 2.6245 | 2.000 | 2.000 | 2.125 | 2.125 | | Inner dia. | 1.5000 | 1.750 | 1.250 | 1.250 | 1.250 | 1.375 | | Length of | | | | | | | | No.1 | 1.950 | 1.950 | 1.675 | 1.525 | 1.500 | | | No.2 | 1.500 | 1.500 | 1.050 | 1.050 | 1.000 | 1.150 | | No.3 | 1.500 | 1.500 | 1.050 | 1.050 | 1.000 | 1.150 | | No.4 | 2.500 | 2.500 | 1.800 | 1.550 | 1.500 | 1.575 | | No.5 | 1.500 | 1.500 | 1.050 | 1.050 | 1.000 | 1.150 | | No.6 | 1.500 | 1.500 | 1.050 | 1.050 | 1.000 | 1.150 | | No.7 | 3.000 | 3.000 | 1.800 | 1.800 | 1.750 | 1.800 | | Crankpins | | | | | | | | Outer dia. | 2.124 | 1.8735 | 1.500 | 1.500 | 1.625 | 1.500 | | Inner dia. | 1.125 | 1.125 | .875 | .750 | .750 | .875 | | Length. | 1.850 | 2.000 | 1.450 | 1.500 | 1.350 | 1.500 | | Crank radius. | 2.750 | 2.750 | 2.250 | 2.250 | 2.250 | 2.250 | | Nose. | | | | | | | | Outer dia. | 1.750 | 1.700 | 1.490 | 1.400 | 1.400 | | | Inner dia. | .750 | 1.000 | 1.100 | .625 | .625 | | | Length. | 3.200 | 2.75 | 4.750 | 2.500 | 2.500 | | Length of pins and journals include fillets but not .010 facings. | ||