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).
Guide for identifying Long clutches for various engines by thrust spring colour and part numbers.
| Identifier | ExFiles\Box 130\3\ scan0080 | |
| Date | 26th April 1939 | |
| 1110 To Da.{Bernard Day - Chassis Design} from Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler}1ZMH.26.4.39. c. By/CKL. c. By/NS.{Norman Scott} c. HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} c. Rm{William Robotham - Chief Engineer}/Wya. c. Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} RE LONG CLUTCHES. In order to identify at sight the correct Long clutches for various engines, the following information will be useful. ENGINE SIZE OF CLUTCH. COLOUR OF THRUST SPRINGS. NOMINAL POUNDAGE. BORG & BECK SPEC.NO. DRG. NO. 8-cyl. 3½ Bore 11" Red 150/155 BB.472 23000/2 6-cyl. 3½ Bore Heavy Car (Wraith type) 11" Light Blue 110/120 BB.471 23000/2 6-cyl. 3½ Bore Light car (Bentley type) 10" Orange 125/135 BB.460 SK31174/2 6-cyl. 3½ Bore (Ripple) 10" Light Blue 110/120 To follow SK31174/2 Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} | ||