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).
Data sheet comparing flywheel specifications for B.60 and B.80 C.I. engines with Lucas starter motors.
| Identifier | ExFiles\Box 130\3\ scan0122 | |
| Date | 23th February 1940 guessed | |
| FLYWHEEL DATA B.60 AND B80-C.I ENGINES - LUCAS STARTER MOTOR | | 8 CYLINDER C.I.-B.80. | 6 CYLINDER C.I.-B.60. | |---|---|---| | ENGINE | 8 CYLINDER C.I.-B.80. | 6 CYLINDER C.I.-B.60. | | CLUTCH | 11" LONG | 10" LONG | Diagram 1 (8 Cylinder): GB-5303 SAME TEETH AND EXTERNAL SHAPE FOR ALL TYPES. Dimensions: 1.850", .550", 148 T, 10/12 D.P., .895", .650", 13.125", 12.9", 13.9" Diagram 2 (6 Cylinder): Dimensions: 1.850", 148 T., 10/12 D.P., .895", .650", 12.125", 12.9", 14.15" TABLE DATA 8 CYLINDER C.I.-B.80. HEAVY: | | DRG. N.o | INERTIA | WEIGHT | |---|---|---|---| | RIM | GB.5303 | 898 | 19.0 LBS | | FACE | GB.5291 | 463 | 16.4" | | DISC. | GB.5292 | 91 | 4.5" | | FLYWHEEL COMP | — | 1452 | 39.9" | | CLUTCH | — | 450 | — | | TOTAL INERTIA | — | 1902 | — | | FLYWHEEL COMPLETE % OF OLD STANDARD | — | 94% | 78% | | FOR USE ON | 31-6-7 | | | REMARKS | LUCAS STARTER | | LIGHT: | | DRG. N.o | INERTIA | WEIGHT | |---|---|---|---| | RIM | | 587 | 12.1 LBS | | FACE | GB.5291 | 463 | 16.4" | | DISC. | GB.5292 | 91 | 4.5" | | FLYWHEEL COMP | — | 1141 | 33.0" | | CLUTCH | — | 450 | — | | TOTAL INERTIA | — | 1591 | — | | FLYWHEEL COMPLETE % OF OLD STANDARD | — | 78% | 65% | | REMARKS | LUCAS STARTER | | 6 CYLINDER C.I.-B.60. HEAVY: | | DRG. N.o | INERTIA | WEIGHT | |---|---|---|---| | RIM | | 1039 | 22.8 LBS | | FACE | GB.5293 | 335 | 14.3" | | DISC. | GB.5013 | 67 | 3.8" | | FLYWHEEL COMP | — | 1441 | 40.9" | | CLUTCH | — | 250 | — | | TOTAL INERTIA | — | 1691 | — | | FLYWHEEL COMPLETE % OF OLD STANDARD | — | 92% | 80% | | REMARKS | LUCAS STARTER | | LIGHT: | | DRG. N.o | INERTIA | WEIGHT | |---|---|---|---| | RIM | | 603 | 13.0 LBS | | FACE | GB.5293 | 335 | 14.3" | | DISC. | GB.5013 | 67 | 3.8" | | FLYWHEEL COMP | — | 1005 | 31.1" | | CLUTCH | — | 250 | — | | TOTAL INERTIA | — | 1255 | — | | FLYWHEEL COMPLETE % OF OLD STANDARD | — | 68.6% | 61% | | FOR USE ON | RIPPLET - 2-R-2 | | | REMARKS | LUCAS STARTER | | | ||