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).
Summary of existing camshafts for various engine models showing their timing and duration.

Identifier  ExFiles\Box 13\2\  02-page163
Date  18th April 1932
  
SHEET 1
ALL DURATIONS ACTUALLY BY TEST BED MEASUREMENT
SUMMARY OF EXISTING CAMSHAFTS P I J II 25 H.P

ALFA ROMEO
27 TO 8
INLET 233
EXHAUST 230.8
DIAGRAM 1: IN 40, EX 55.5, .020 CLCE

112° EXP. CAMSHAFT
W.W. E.57177
TWO EXHAUST CAMS D.35
INLET 229
EXHAUST 233.5
DIAGRAM 2: IN 50, EX 49, .020

118.5°
W.W. E.57177
FOR CHINA
INLET = 213.5
EXHAUST = 230
DIAGRAM 3: IN 44, EX 40.5, .020

J III SHAFT
INLET DURN = 213
EXHAUST DURN = 228.2
DIAGRAM 4: IN 41.2, EX 40, .020

114° PII
22.75
E.87448
INLET 230
EXHAUST 236
DIAGRAM 5: IN 49, EX 52, .020

OLD STANDARD PII
116°
22 12 6
INLET 213.6
EXHAUST 228
DIAGRAM 6: IN 50, EX 46.1, .020

R ENGINE CAMS
110° SHAFT
17 18 6
INLET 256.5
EXHAUST 254
DIAGRAM 7: IN 56, EX 53.5, .020
  
  


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