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).
Testing a new bulged cylinder head end cover (Scheme Lec.5200) to improve cooling on the Phantom III engine.
| Identifier | ExFiles\Box 93\4\ scan0071 | |
| Date | 14th October 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} X319 Hs{Lord Ernest Hives - Chair}/Std.21/JH.14.10.36. Report on Cylinder Head End Cover. Scheme Lec.5200. This scheme was produced to endeavour to reduce the temperature difference which exists between the water outlet on the Phantom III head and the thermometer pocket at the rear of the head, due to the poor communication between water spaces of the exhaust and inlet sides. It consists of cylinder head end covers which are bulged instead of flat in order to increase the space for communication across the rear end of the head. The scheme was tested on an engine on the test bed which was rigged up with a radiator to reproduce the car's cooling system. Temperatures at the rear and front of the block were measured with (1) Standard cylinder head end cover. (2) End cover to Lec.5200. Results. Condition of test. | Speed (RPM). (all tests at full throttle) | Temp. at outlet from cyl. head (oC). | Temp. at thermometer pocket at rear of head (oC). | Difference between front and rear. --- | --- | --- | --- | --- Standard cyl. head end covers. | 750 | 75 | 80 | 5oC. | 3000 | 76 | 80 | 4oC. End covers. to Lec.5200 | 750 | 75 | 80 | 5oC. | 3000 | 76 | 80 | 4oC. | ||