Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Tests to determine the effect of improved waterways on cylinder head temperatures.

Identifier  ExFiles\Box 132\4\  scan0129
Date  3rd March 1938
  
To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Std.
c. Da.{Bernard Day - Chassis Design}.
c. Hs.{Lord Ernest Hives - Chair}
c. Da{Bernard Day - Chassis Design}/MoS.

REPORT ON TESTS CARRIED OUT ON CYLINDER HEADS F.89206 ON TEST BED TO DETERMINE EFFECT OF IMPROVED WATERWAYS ON CYLINDER HEAD LOCAL TEMPERATURES.

TESTS.
A Ph.III. engine fitted with these heads was run under full load conditions at 3000 R.P.M. and 1000 R.P.M. on the test bed and local temperatures at various spots in the cylinder heads were measured by thermocouples by the external contact method.

RESULTS.
These are shown on attached chart (Sheet 1) compared with previous results obtained on the Ph.III. Continental engine (No.14. unit), which was fitted with the original type of 4 port heads.
The points at which the local temperatures were recorded are identical in both sets of tests, however, the cooling water flow was more favourable to the reduction of local temperatures in the case of the Continental engine figures since it was operating with a radiator fixed up in a similar manner to a car, and also had a water pump running at 1 1/2 times engine speed, instead of the standard 1 1/4 ratio. The tests with the new heads were done on the usual test bed cooling system, the hydraulic resistance of which results in a smaller cooling water flow.

CONCLUSIONS.
The new heads have very much lower local cylinder head temperatures than the previous heads (either 6 or 4 port) and are therefore a very definite improvement. These increased waterways will also presumably help the Foundry and should be standardised as soon as possible.

Rm{William Robotham - Chief Engineer}/Std.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙