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).
Comparison table of actual and theoretical valve bouncing speeds for various engines.
| Identifier | ExFiles\Box 106\5\ scan0134 | |
| Date | 18th July 1934 | |
| -2- Hs{Lord Ernest Hives - Chair}/Smth.S/KW.18.7.34. Engine Camshaft Valve & Fittings Actual Bouncing Speed Theo. Bouncing Speed Ratio Th. Speed / Act. Speed Phantom II E.82448 LOP E.83438 3500 4300 1.23 Bentley EB.1085 LOP.EB.141 & Light Springs 4350 4260 .985 Bentley EB.1085 LOP.EB.141 & Springs Hs.{Lord Ernest Hives - Chair}1125 in Valve EX.12089. 4400 4550 1.035 Bentley EB.1085 LOP EB.141 4800 5300 1.10 20/25 HP. E.59919 E.55577. 4100 4670 1.14 Kestrel. E.32801 Springs E.29832/3 3200 3200 1.0 X Kestrel E.32801 E.39728 3760 4060 1.08 X Goshawk Des.1734 Des.1545 3900 4400 1.13 X Goshawk Des.1739 Des.1545 3400 4080 1.20 X 'R' Engine LOP. E.33672 3600 3740 1.04 X = Rig Tests. | ||