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 of figures comparing chassis starter rolling conditions for various motor models.
| Identifier | ExFiles\Box 61b\3\ scan0189 | |
| Date | 11th May 1927 | |
| X523 CHASSIS STARTER ROLLING CONDITION FIGURES. X3082 X523 | MOTOR. | 45a. | 45a.sd. | 45b.expl. | 45b.prodn. | 45b.sp.{Mr Spinney} | 45b.v.i.a. | 45b. V.i.a. Series par¹ | |---|---|---|---|---|---|---|---| | ENGINE TORQUE. | 1155 | 1155 | 1155 | 1155 | 1155 | 1155 | 1155 | | GEAR RATIO. | 23.3 | 23.3 | 23.3 | 23.3 | 23.3 | 23.3 | 23.3 | | MOTOR TORQUE. | 55 | 55 | 55 | 55 | 55 | 55 | 55 | | MOTOR SPEED. | 940 | 1430 | 1030 | 980 | 1280 | 1075 | 1195 | | AMPERES. | 117 | 133 | 111 | 120 | 151 | 107 | 145 | | VOLTS. | 10.0 | 9.9 | 9.7 | 9.5 | 9.0 | 9.90 | 9.10 | | ENGINE SPEED. | 40 | 61 | 44 | 42 | 55 | 46 | 51 | | E.H.P. | 1.57 | 1.77 | 1.44 | 1.53 | 1.82 | 1.45 | 1.76 | | B.H.P. | .82 | 1.25 | .90 | .855 | 1.12 | .94 | 1.03 | | EFFICIENCY. | .52 | .705 | .625 | .56 | .61 | .65 | .59 | 11.5.27. EFC. | ||