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 camshaft and valve performance data across various engine models.
| Identifier | ExFiles\Box 17\6\ Scan297 | |
| Date | 18th July 1934 | |
| -2- Ha/Bath.3/KW.18.7.34 | Engine | Camshaft | Valve & Fittings | Actual Bouncing Speed | Theo. Bouncing Speed | Ratio Theo.Speed / Act.Speed | |---|---|---|---|---|---| | Phantom II | E.82448 | LOP E.83438 | 3500 | 4300 | 1.23 | | Bentley | EB.1085 | LOP.EB.141 & Light Springs | 4350 | 4250 | .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 | 4050 | 1.20 X | | 'R' Engine | | LOP. E.33672 | 3600 | 3740 | 1.04 | X = Rig Tests. | ||