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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).
Test report on engine oil temperature at the bearings under various conditions.

Identifier  ExFiles\Box 179b\3\  img320
Date  8th February 1933 guessed
  
HS{Lord Ernest Hives - Chair} 858

CONDITION OF ENGINE
OIL TEMP INLET TO THE BEARINGS THAT WILL BE REACHED AT 75 M.P.H. WITH AIR TEMP OF 30° C

1) PLAIN BOTTOM HALF. OIL PRESSURE 50 LBS/SQ" NONE TURBULENT OIL FLOW ACROSS BASE.
145°C

2) PLAIN BOTTOM HALF. OIL PRESSURE 20 LBS/SQ" TURBULENT FLOW.
135°C

3) RIBBED SUMP. OIL PRESSURE 20 LBS/SQ" TURBULENT FLOW.
128°C

4) RIBBED SUMP. OIL PRESSURE 20 LBS/SQ" TURBULENT FLOW. RADIATOR SHUTTERS FULLY OPEN *
118°C

5) FURTHER DROP THAT COULD BE OBTAINED BY HONEYCOMB WATER COOLER IN THE SYSTEM.
103°C

WITH AN OIL PRESSURE OF 50 LBS/SQ" THE BEARINGS WILL NOT RUN IF THE INLET OIL TEMP IS KEPT BELOW 100°C. WITH 20 LBS/SQ" OIL PRESSURE, HOWEVER, IT IS PROBABLE THAT AN OIL INLET TO THE BEARINGS OF 85°C SHOULD NOT BE EXCEEDED. THEREFORE EVEN IN CONDITION ⑤ WE ARE 18° SHORT OF A SAFE TEMPERATURE.

* THESE TESTS WERE TAKEN AT 0°C AND CORRECTED UP TO 30° C AIR. THE ARTIFICIAL POSITION THEREFORE AROSE THAT THE RADIATOR SHUTTERS WERE ALMOST CLOSED WHICH DEPRIVED THE TOP HALF OF ITS COOLING DRAUGHT AT 30°C THEY WOULD HAVE BEEN FULLY OPEN. A TEST WAS THEREFORE CARRIED OUT IN THIS CONDITION.
  
  


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