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).
Blueprint detailing E.A.C. valve and ignition timing settings and tappet adjustments.
| Identifier | ExFiles\Box 66a\2\ scan0005 | |
| Date | 14th May 1925 | |
| E.A.C. VALVE TIMING. X8060 110° CAMSHAFT TIMING WITH .010 TAPPET CLCE. DIAGRAM 1 (Left): IN. 0° EX. 12° EX. 48° IN. 44 TIMING WITH .020 TAPPET CLCE. DIAGRAM 2 (Right): EX. 2° IN. 14° EX. 34° IN 30° 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 DEGREES. TAPPET ADJUSTMENT. SILICHROME 45° TULIP VALVES. EXHAUST VALVE. TABLE: CONDITION | CLCE. FULL LOAD 2000 R.P.M. | JUST FREE. LIGHT RUNNING WATER 80°C. | .006 COLD | .003 INLET VALVES MUST BE JUST FREE WHEN ENGINE IS COLD. IGNITION TIMING. FULL RETARD. DIAGRAM 3 (Bottom): MAG. 12° BAT. 10° 7.2° = 1" ON CIRCUMFERENCE OF FLYWHEEL 1 TOOTH = 7 1/2° ON FLYWHEEL STAMP: LIMITED. OM. 14 MAY 1925 DERBY. | ||