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).
Performance graph comparing large versus small valves on a 4.9 CR engine with a 114° R camshaft.
| Identifier | Morton\M19\ img204 | |
| Date | 17th June 1931 guessed | |
| Hs.{Lord Ernest Hives - Chair} 380 COMPARISON LARGE & SMALL VALVES H.s. 380 4.9 CR{Mr Cra???ster / Mr Chichester} 114° R CAMSHAFT OPEN EXHAUST SINGLE CLAUDEL CARB BOUNCE Valve Timing Diagram: EX IN 12 14 65.6 60 Left Y-Axis: B.H.P. Right Y-Axis: B.M.E.P. X-Axis: R.P.M. Table: BASE OF SEAT DIA INLET EXHAUST LARGE VALVES 2.1" 1.95" SMALL VALVES 2.0" 1.85" Key: LARGE SMALL | ||