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 two graphs from valve lift tests comparing standard and double area valves.
| Identifier | ExFiles\Box 151\2\ scan0041 | |
| Date | 23th March 1933 | |
| VALVE LIFT TESTS. NS {Norman Scott} 3497 23-3-33 Top Graph: 172 LB/IN VALVE SPRING VALVE LIFT - INS. .060 .040 .020 AXLE VELOCITY FT/SEC. .5 1.0 1.5 STANDARD VALVE DOUBLE AREA VALVE .025" VALVE SEAT Bottom Graph: 100 LB/IN VALVE SPRING VALVE LIFT - INS. .060 .040 .020 AXLE VELOCITY FT/SEC. .5 1.0 1.5 STANDARD VALVE DOUBLE AREA VALVE .025" VALVE SEAT | ||