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).
Valve bounce observed using an oscilloscope on engine 1-EAG-11 at various speeds.
| Identifier | Morton\M3.4\ img030 | |
| Date | 9th September 1924 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/EHF/L.G1/9.9.24. VALVE BOUNCE - "OSCILLOSCOPE". Engine 1-EAG-11 - with high lift Camshaft. SPEEDS. 2500 Inlets and exhausts follow cam. 2570 Inlets just starting to bounce on closing. Exhaust steady. 2600 Inlet valves bounce slightly on both opening and closing. Exhaust valves steady. 2650 Inlet valves bounce opening only. Exhaust steady. 2700 Inlet valves bounce closing only. 2750 Inlet valves bounce considerably - closing only. 2850 Inlet valves bounce - opening only. 2950 Inlet valves bounce on opening and slightly on closing. Exhaust valves bounce closing. ------------------------- contd :- | ||