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).
Graph showing the effect of large valves and long duration cams on power output for a 20 HP engine.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 172 | |
| Date | 26th May 1927 | |
| 20 H.P. R.R. EXPERIMENTS. CURVES SHEWING THE EFFECT OF LARGE VALVES AND LONG DURATION CAMS ON THE POWER OUTPUT. SEE REPORTS ON 20 HP. CAMSHAFT EXPTS. 23-5-27 AND 26-5-27. LARGE VALVES AND LONG DURATION INLET & EXHAUST CAMS. VALVE AREA INCREASED BY 40%. STANDARD. B.H.P. R.P.M 90 80 70 60 50 40 1500 2000 2500 3000 3500 No.4. OOK | ||