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).
Table comparing the dimensions and specifications of crankshafts for various engine models.
| Identifier | ExFiles\Box 6\1\ 01-page105 | |
| Date | 14th December 1927 guessed | |
| X5010 CRANKSHAFT DETAILS X8010 X3531 | | Phantom | Sports Phantom | 1-G-1 | Std. 20 HP. | Stiffer 20 HP. | India Ill. | |--- |--- |--- |--- |--- |--- |--- | | Engine. Part No. | E.75218 | E.76546 | E.18881 | E.54084 | E.51976 | 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 | 1.150 | | 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 | | Rear. | | | | | | | | Outer dia. | 1.750 | 1.700 | 1.490 | 1.400 | 1.400 | [Obscured] | | Inner dia. | .750 | 1.000 | 1.100 | .625 | .625 | [Obscured] | | Length. | 3.200 | 2.75 | 4.750 | 2.500 | 2.500 | [Obscured] | Length of pins and journals include fillets but not .010 facings. | ||