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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).
Performance graphs comparing different valve springs and push rod stiffness on a Phantom II valve spring rig.

Identifier  ExFiles\Box 17\6\  Scan329
Date  29th November 1934 guessed
  
FIG. 3
PHANTOM II VALVE SPRING RIG
No.1 INLET VALVE
STANDARD CAMSHAFT E82448
ENGINE SPEED 3500 RPM

(a) VALVE SPRING E81550
(b) VALVE SPRING E81550
(c) VALVE SPRING E81550
(d) VALVE SPRING E85666

Graph Labels:
CLOSING
ACCLN. REVERSAL
HEAVY POSVE. OPENING

Table: VALVE SPRING LOADS
SPRING | SEAT LOAD | RATE
E81550 | 70 | 96
E85666 | 85 | 155

Table: REL. PUSH ROD STIFFNESS
(a) | 1.20
(b) STANDARD | 1.00
(c) | 0.75

Other markings:
12B
14B
16A°
  
  


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