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 detailing engine characteristics with a specific camshaft, head configuration, and open exhaust.
| Identifier | ExFiles\Box 179b\2\ img112 | |
| Date | 4th October 1932 guessed | |
| L.E.C. 3(57) R.M.PR.31 THROAT HEAD E.100520 OPEN EX. CAMSHAFT. LONG TOE WITH .020 CLEARANCE IO T.D.C. EO. 38° B BDC IC 45° PBDC EC. 13° P TDC SUCTION PISTON RR REMOVED B.M.E.P. DEPN INS HG | ||