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 showing designs and modifications for inlet and exhaust valves with various measurements.
| Identifier | ExFiles\Box 106\5\ scan0056 | |
| Date | 28th November 1931 | |
| Top Left Proposals: Proposals. Bottom Washer. Remove .025 from T.R.P. to improve washer clearance. Remove .025 from Lower Spring face to improve spring coil clearance :- Reduce diameter 1.400 to 1.350. Top Right Calculation: Spring E 56325 Choke length = 144 x 7 / 5 = 1.008 - 144 / 5 = .960 Main Drawing Components & Annotations: Left Section (Valve I): .620 / .439 Remove .025 E57353 E57225 .312 I Should high lift Camshaft-Exhaust-valves without improved Exhaust Valves Bottom Washer E57227 is used Inlet Valve for .415 lift. Table of Figures: .465 .485 4.079 .675 .050 .560 4.049 .475 .010 .085 4.0-9 .070 2.66- .155 2.510 2.665 1.394 between washer faces. .400 lift .994 thin distance Center Section (Valve II & Details): In. 6 .449 w/top washer. .030 / .018 .445 w/o c/dye. .100 +.10 .150 +/- .015 ES1088 ES0147 ES6050 ES6051 .595 / .414 .250 / .230 .725 +.10 .485 / .465 +10 / -25 E56058 4.123 4.362 / 4.079 +15 (.408) Ex. E53158 In. E55335 .312 II .675 +/- .015 .400 +/- .010 .390 / .350 .520 / .330 (1.447) -> .15804 / 1.362 -> .1180 / .969 .660 / .645 see below Lt corner Closed Open .475 +.10 Right Section (Valve III): 1.263 / 1.225 .950 / .975 3.750 E57353 .400 Lift 1.075 Spring Washer 1.400 / 1.363 .343 III E57303 for Existing Heads E56824 Modfn for New Heads E57301 Improved Exhaust Valve with .400 lift. 2.510 / 2.470 3.875 -15 (2.00) Bottom Center Section: .187 .063/.058 .138/.119 1.260 +2/-2 1.325 -5 .900 +15 Cylinder Head ES5298 Master Drg E54381 Std Valves. Inlet & Exhaust Scale 2/1. Stamp: ROLLS-ROYCE, LIMITED PRINT ROOM 28 NOV 31 | ||