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).
Table of actual valve timing data for various camshaft settings from twin carburettor tests on the 'Japan' engine.
| Identifier | ExFiles\Box 102\5\ scan0043 | |
| Date | 27th May 1930 | |
| ACTUAL VALVE TIMING TAKEN ON ENGINE WITH .020 TAPPET CLCE. TABLE DATA: CAMSHAFT | 116° | 112° | 110° --- IN. OPENS. | 13° A.T.C. | 7° A.T.C. | 16° A.T.C. IN CLOSES | 48° A.B.C. | 43° A.B.C. | 37° A.B.C. EX. OPENS | 42° B.B.C. | 43° B.B.C. | 28 B.B.C. EX. CLOSES | 2° A.T.C. | 5° A.T.C. | 4° A.T.C. ABOVE ARE THE BEST TIMINGS FOUND DURING TWIN CARB TESTS ON "JAPAN". STAMPED TEXT: ROLLS-ROYCE, LIMITED TEST ROOM, 27 MAY 1930 DRV HANDWRITTEN INITIALS: aeb | ||