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).
Investigation into high cylinder head water temperatures on Phantom III engines.
| Identifier | ExFiles\Box 93\4\ scan0033 | |
| Date | 29th June 1936 | |
| x319 To S. c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} c. to Mx.{John H Maddocks - Chief Proving Officer} Hs{Lord Ernest Hives - Chair}/Std.10/KW.29.6.36. Report on Investigation into Local Cylinder Head Water Temperatures on Phantom III Engines. As a result of complaints from the Test Department that the water temperatures were running high on some of the first Phantom III chassis, a number of tests and investigations were carried out. These were as set out below. (1) Several production chassis and the experimental car 33-EX were run over a selected piece of road, finishing at the top of Ticknall Hill, and the temperatures at the normal thermometer pocket position, and also in the radiator top tank, were recorded. Results are shown under heading "Road Test I" on attached sheets. (2) From the results of Test (1) it was concluded that the variation in temperature differences between cylinder head and top tank was due to variation in cylinder head castings. The cylinder heads off No.38 car (whose temperature difference was very small) were therefore fitted to No.30 car (whose temperature difference was large). The result was to reduce the temperature difference from 10°C. to 6.5°C. In view of this, the heads and cylinder liners were removed from No.30 car for inspection of the cylinder blocks but no explanation of the difference from No.38 car was discernable. (3) All core plugs etc. were removed from No.30 car's heads but no obstruction or reason for the difference between heads could be observed. It was obvious, however, that many of the water passages between the exhaust side of the head and the inlet side were very small in size, and also that the thermometer bulb is in a semi-isolated pocket. | ||