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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).
Analysis of the resistance load of plungers in relation to rocker arm loads and clearances.

Identifier  ExFiles\Box 17\6\  Scan340
Date  20th March 1935
  
-2- Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}28/KW.20.3.35.

In conjunction with a chart showing the
frictional load and turning load due to eccentric bearing
of the rocker during the opening and closing of an inlet and
exhaust valve, we herewith give the resistance load of the
plungers showing that the leak factor could be considerably
increased, and still cope with the loads of the eccentric
and keep the rocker clearance down to its limit.
  
  


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