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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).
Graph plotting the speed at which the No.6 exhaust valve rides against the valve spring load for PI Unit BJ55.

Identifier  ExFiles\Box 17\6\  Scan260
Date  21th June 1934
  
ROLLS-ROYCE, LTD
PRINT ROOM
JUN 21 1934
DERBY.
PI UNIT BJ55 WITH HIGH COMP. HEAD & E82448 CAMSHAFT
SPEED AT WHICH NO.6 EXHAUST VALVE RIDES PLOTTED
AGAINST SPRING LOAD
☉ LOAD AT 1st CHANGE OVER PT
x LOAD AT MAX. LIFT
RPM
3250
3000
2750
2500
☉SEAT LOAD
VALVE SPRING LOAD
50 60 70 80 90 100 120 140 160 180 200 220
LINE OF SLOPE 1/2
FIG 1.
F.L.L.S.
116. VI. 34.
  
  


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