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).
Blueprint comparing inlet, standard, and improved exhaust valves, with handwritten modification proposals.
| Identifier | ExFiles\Box 102\5\ scan0107 | |
| Date | 23th November 1931 | |
| TOP LEFT NOTES: Proposals. Bottom Washer. Remove .025 from Top to improve washer clearance. From lower Spring face .025 to improve spring coil clearance. Reduce diameter 1.400 to 1.350. TOP RIGHT NOTES: Spring E56325 Closed length = .144 x 7 = 1.008 - .144/2 = .960 LEFT DRAWING (Inlet Valve for 400 lift): Part Numbers: E57353, E57225 Annotations: Short high lift Camshaft Exhaust. Without improved Exhaust Valves Bottom washer E57227 is used. Dimensions/Calculations Table: .485 | 4.079 .675 | .030 560 | 4.049 .085 | .810 .070 | 4.059 .155 | 2.665 2.510 | 1.394 between washer faces. 2.665 | .400 lift | .994 min distance CENTER DRAWING (Std Valves Inlet + Exhaust): Part Numbers: E51088, E50147, E56050, E56051, E56058, Ex E53158, In. E55335 Annotations: Cylinder Head E55298 Master Dg E54381 1 in 6 .449 Top washer .448 Wedge 400 Lift Closed Open see below LH{Mr Haworth} corner RIGHT DRAWING (Improved Exhaust Valve with .400 Lift): Part Numbers: E57353, E57301 Annotations: E57303 for Existing Heads E56824 Modfn for New Heads 1.075 Spring Washer GENERAL DIMENSIONS AND ANNOTATIONS: .620, .439, Remove .025, .595, .414, .150is, .725, .485, .030, .018, .100, .015, .390, .350, Added .010, .400, .520, (.387), .330, 1.5804, (1.447), .1180, 1.060, .969, .660, .645, 4.123, 4.079, +15, (408), .312, I, 1.263, 1.225, .950, .975, .375, .250, .230, .475, 1.325, 1.400, .343, III, 2.510, 2.470, 3.875, -.15, .187, .063, .038, .133, .119, 1.200, 1.325, .900, +15 STAMP (Bottom Right): ROLLS-ROYCE, LIMITED. PRINT ROOM, 23 NOV 31 DERBY | ||