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).
Diagrams and specifications for E.A.C. valve timing, ignition timing, and tappet adjustments.
| Identifier | ExFiles\Box 66a\2\ scan0004 | |
| Date | 17th March 1925 | |
| E.A.C. VALVE TIMING. TIMING WITH .010 TAPPET CLCE. IN. 0° EX. 12° IN. 44° EX. 48° TIMING WITH .020 TAPPET CLCE. EX. 2° IN. 14° IN. 30° EX. 34° THIS IS THE EARLIEST TIMING WHICH SHOULD BE USED. EARLIER WILL CAUSE "INDUCTION ROARING". THE LATEST TIMING SHOULD NOT BE MORE THAN 7 1/2° LATER THAN THESE DIAGRAMS. IGNITION TIMING. FULL RETARD. MAG. 12° BAT. 10° TAPPET ADJUSTMENT. SILICHROME 45° TULIP VALVES. EXHAUST VALVE. TABLE: FULL LOAD 2000 R.P.M. - CLCE. JUST FREE. LIGHT RUNNING WATER 80°C. - CLCE. .006 COLD - CLCE. .003 INLET VALVES MUST BE JUST FREE WHEN ENGINE IS COLD. 7.2° = 1" ON CIRCUMFERENCE OF FLYWHEEL 1 TOOTH = 7 1/2° ON FLYWHEEL STAMP: ROLLS-ROYCE, LIMITED PRINT ROOM 17 MAR. 25 DERBY | ||