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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).
Comparing oil pressures for valve gear lubrication during engine warming up versus normal operation.

Identifier  ExFiles\Box 14\2\  Scan036
Date  2nd February 1929
  
X7010
E2/M25. 2. 29.

R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer}
c. to Sg.{Arthur F. Sidgreaves - MD} Hs.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer}

RE. VALVE GEAR LUBRICATION. X. 7060
X. 7010

The attached report Hs{Lord Ernest Hives - Chair} 7/LHd9. 2. 29 shews that the intermediate oil supply as we anticipated reaches quite a high pressure during the warming up period, and might therefore be used to get oil to the valve gear early.
The comparison with normal running pressures is as follows:

WARMING UP. NORMAL.
HIGH........... 32 lbs/sq. in. 25.0
INTERMEDIATE..... 16 " " " 3.5
LOW............ 5.5 " " " 1.75

e.{Mr Elliott - Chief Engineer}
  
  


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