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 of high and low lift rockers with twin Zenith carburettors for the Japan Unit engine.
| Identifier | ExFiles\Box 102\1\ scan0038 | |
| Date | 1st January 1940 guessed | |
| R.M.44 COMPARISON OF HIGH & LOW LIFT ROCKERS, WITH TWIN ZENITH CARBS. JAPAN UNIT. INLET VALVE DIA 1.4, OPEN EXHAUST 1 1/2", CAMSHAFT F55640 CHART A: LIFT .395 LIFT .344 COMP. RATIO 5.35/1 TIMING TOO EARLY FOR MAX. POWER. VALVES SHROUDED BY CYL. HEAD. DIAGRAM A: IN, Ex, 46, 2, 55, 40, .013 CLCE CHART B: LIFT .395 LIFT .344 COMP RATIO 5.15/1 TIMING TOO EARLY FOR MAX. POWER. MIN. CLCE OF .225 CUT ROUND INLET VALVE. DIAGRAM B: IN, Ex, 46, 2, 55, 40, .013 CLCE CHART C: LIFT .395 LIFT .344 COMP RATIO 5.15/1 TIMING CORRECT FOR MAX. POWER. MIN. CLCE. OF .225 ROUND INLET VALVE. DIAGRAM C: IN, Ex, 3.2, 10.6, 46, 46, .013 CLCE AXES LABELS: B.H.P. M.E.P. R.P.M. VERTICAL: 80, 70, 60 VERTICAL (RIGHT): 120, 110 HORIZONTAL: 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000 | ||