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 for various 20 HP crankshafts.
| Identifier | ExFiles\Box 6\1\ 01-page169 | |
| Date | 27th November 1928 | |
| 20 HP CRANKSHAFTS | PIECE NO. | SHAPE OF WEB | DIA OF JOURNAL | DIA OF CRANK PIN | SPRING DRIVE END | REAR END THRUST | REMARKS | |-----------|--------------|----------------|------------------|---------------------------|-----------------|--------------------------------------------| | E54066 | PARALLEL | 2.000 | 1.500 | STANDARD | STANDARD | "L" SERIES. NO OIL CAPS IN PINS. | | E54601 | 3" OVAL | 2.125 | 1.500 | LOW INERTIA LEC 2457 | NEW LEC 2480 | | | E54640 | 3" OVAL | 2.125 | 1.500 | STANDARD | NEW LEC 2480 | Do. TUBULAR CON RODS. | | E54643 | 3 1/8" OVAL | 2.125 | 1.750 | LOW INERTIA LEC 2457 | NEW LEC 2480 | | | E54700 | 3 1/8" OVAL | 2.125 | 1.750 | | NEW LEC 2480 | | | E54701 | 3" OVAL | 2.000 | 1.500 | STANDARD | STANDARD | SERIES "M" TO "O" | | E55127 | 3 1/8" OVAL | 2.125 | 1.750 | STANDARD | NEW LEC 2480 | | | E55288 | 3 1/8" OVAL | 2.125 | 1.750 | STANDARD | NEW LEC 2480 | SIMILAR TO E55127 "NITRALLOY" MATL. | | E55307 | 3 1/8" OVAL | 2.125 | 1.750 | AUTO FRICTION OR LOW INERTIA | NEW LEC 2480 | "P" & "R" SERIES | | E55507 | | | | | | SIMILAR TO E55307 IN "NITRALLOY" MATL. | | E55599 | 3 1/8" OVAL | 2.125 | 2.000 | AUTO FRICTION OR LOW INERTIA | STANDARD | | | E55619 | 3 1/8" OVAL | 2.125 | 2.000 | AUTO FRICTION OR LOW INERTIA | STANDARD | | STAMPED TEXT: MOD, 27 NOV 1928, V.{VIENNA} HANDWRITTEN TEXT: 26.11.28. | ||