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).
Graphical comparison of performance for high and low lift rockers with twin zenith carburettors.
| Identifier | ExFiles\Box 5a\5\ 05-page170 | |
| Date | 1st October 1931 guessed | |
| R.M.44 COMPARISON OF HIGH & LOW LIFT ROCKERS WITH TWIN ZENITH CARBS. INLET VALVE DIA 1 1/4" OPEN EXHAUST 1 1/2" CAMSHAFT F.55640 JAPAN UNIT B.H.P. M.E.P. R.P.M. SECTION A: LIFT .395 LIFT .344 COMP. RATIO 5.35/1 Timing Diagram values: 4.5, 2, IN 55, EX 40, .013 CLCE TIMING TOO EARLY FOR MAX POWER VALVES SHROUDED BY CYL. HEAD SECTION B: LIFT .395 LIFT .344 COMP. RATIO 5.15/1 Timing Diagram values: 4.5, 2, IN 55, EX 40, .013 CLCE TIMING TOO EARLY FOR MAX POWER MIN. CLCE OF .225 CUT ROUND INLET VALVE. SECTION C: LIFT .395 LIFT .344 COMP. RATIO 5.15/1 Timing Diagram values: +2, 10.5, IN 46, EX 46, .013 CLCE TIMING CORRECT FOR MAX POWER. MIN CLCE OF .225 ROUND INLET VALVE. | ||