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 chart comparing brake horse power and BMEP against RPM for different camshaft timings.
| Identifier | ExFiles\Box 5a\5\ 05-page116 | |
| Date | 1st October 1930 | |
| V761 112° LONG DURATION CAMSHAFT (CHINA) Engine IT Spec S1 Compression 7:1 Carb's 'Yin' Petrol & Benzol 50/50 17° Lagging Ign'n R.H. Magneto Compression Ratio 5.3 to 1 Unsupercharged 112° Camshaft, D5642 Inlet Opens 14° before TDC Inlet Closes 41° after BDC Exh Opens 44° before BDC Exhaust Closes 20° after TDC BRAKE HORSE POWER B.M.E.P. (LBS PER SQ. IN.) RPM OF ENGINE Graph Labels: STD (110°) Camshaft (E54110-3) 116° Camshaft (E55866) VALVE TIMINGS Table: Header: (102° C.L.O) 116° CAMSHAFT | 110° CAMSHAFT Inlet Opens: 14° AFTER TDC | 10° AFTER TDC Inlet Closes: 50° AFTER BDC | 38° AFTER BDC Exhaust Opens: 44° BEFORE BDC | 38° BEFORE BDC Exhaust Closes: 20° AFTER TDC | 2° BEFORE TDC DRG 1.10.30 | ||