Rolls-Royce Archives
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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 showing actual valve timings taken from an engine during twin carburettor tests on 'Japan'.

Identifier  ExFiles\Box 122\1\  scan0062
Date  27th May 1930
  
ACTUAL VALVE TIMING TAKEN ON ENGINE WITH .020 TAPPET CLCE.

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-R]OYCE, LIMITED
[DEVELOP]MENT ROOM,
27 MAY 1930
DERBY.

[HANDWRITTEN INITIALS]
aek
  
  


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