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 dimensions for various starter motors.
| Identifier | ExFiles\Box 61b\3\ scan0117 | |
| Date | 9th March 1921 | |
| X 543. STARTER MOTOR TABLES. X.3174. (Additional Sheet). | STARTER MOTOR. | X.3247. C.A.V. Z.C. | X.3161. Lucas A.510. | X.1058. Bijur A.21. | X.1248. Bosch B.45. | X.2642. R.R.17. Cic. | X.2642. (cic) | X.2642. R.R.45a. (cic) | X.3082. R.R.45b. (sc). | X.3534. Goshawk. | X.1058. Bijur A.T.D. | X.4007. U.S.A. Bosch. | X.1086. Westinghouse. | X.3740. R.R.45c. (U.S.A. motor). | |---|---|---|---|---|---|---|---|---|---|---|---|---|---| | **CARCASE** | | | | | | | | | | | | | | | Diameter. | 4.500 | 5.650 | 5.500 | 5.900 | | | | 6.000 | 5.000 | 5.500 | 4.850 | 4.940 | 6.000 | | Length. | 5.375 | 3.750 | 7.600 | 4.760 | Not circular. | Not circular. | Not circular. | 5.175 | 3.625 | 7.250 | 5.920 | 5.600 | 4.475 | | Thickness. | .280 | .375 | .275 | .385 | | | | .325 | .325 | .270 | .240 | .300 | .325 | | **ARMATURE** | | | | | | | | | | | | | | | Diameter. | 2.870 | 3.575 | 3.560 | 3.700 | 3.600 | 3.600 | 3.600 | 3.600 | 2.795 | 3.875 | 3.250 | 3.250 | 3.600 | | Length (active) | 2.800 | 2.050 | 3.000 | 2.870 | 2.550 | 2.550 | 2.550 | 2.250 | 1.700 | 2.670 | 3.800 | 3.300 | 1.575 | Note:- All machines are 12 volt except Bijur A.21 which is 6 volt. Handwritten Note: also R.R. starter motor for early cars. | ||