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).
Conclusions regarding temperature differences in the water jackets of Phantom III cylinder heads.
| Identifier | ExFiles\Box 93\4\ scan0035 | |
| Date | 29th June 1936 | |
| -3- Hs{Lord Ernest Hives - Chair}/Std.10/KW.29.6.36. Conclusions. (1) On Ph.III cylinder heads considerable differences in temperature exist between various points in the water jacket, also between outlet water and rear of cylinder head jacket. (2) These differences vary considerably for different heads. (3) These differences are due basically to inadequate water passage communication between the exhaust and inlet sides of the cylinder head (via water-ways between and above ports etc.). (4) The defects mentioned can be remedied to a certain extent by blanking off water holes in the cylinder heads as shown on print Rm.{William Robotham - Chief Engineer}168 attached. This reduces the temperature difference between the front outlet and rear of cylinder head to about 2-3°C., but still permits local hot spots in the jacket which exceed the general water outlet temperature by 23°C. | ||