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).
The comparison of waterways in Bentley and Phantom III cylinder heads and proposed modifications.
| Identifier | ExFiles\Box 93\4\ scan0055 | |
| Date | 4th August 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/Std.8/MA.4.8.36. Cont'd.{John DeLooze - Company Secretary} (4) The waterways on the Bentley head are very much bigger than those on the Phantom III head, both on the drawing and in the casting. It seems surprising that the small variation in size of waterway between the two sections of the Phantom III head should cause such a difference in temperature, however, since no other explanation can be found, this must be accepted, and it would appear that all trouble could be eliminated by increasing the size of these waterways. Since these/ways are not even /water accurate to drawing, we have been in touch verbally with the Foundry and Pattern Shop. The Pattern Shop have agreed to alter the core boxes, (which are not at present correct to drawing) to give larger waterways. We would stress the importance of this alteration being made immediately and of casting production heads with improved waterways at the earliest possible moment, a head modified in this manner will be tested at the earliest opportunity. A further point of course is that on the Bentley head the thermometer is situated in the main water space and not in a pocket which communicates with the main space by means of these small waterways around the valve ports, hence on the Phantom III head it is of increased importance that the transverse waterways should approach the Bentley in size as far as possible. We hope that the increased waterways and the end cover to LeC.5200 will obviate this temperature difference difficulty. Attached - three photographic plates. Hs{Lord Ernest Hives - Chair}/Std. | ||