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).
Instructing modifications to a cylinder head for larger valves and higher compression ratios.
| Identifier | ExFiles\Box 86\1\ scan0020 | |
| Date | 7th June 1933 | |
| C.T. Salt. --------- X219. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}14/KT. 7.6.33. Will you please follow up the cylinder head instructed in the attached note. We think that with these larger valves we shall require still higher compression ratios. We should therefore like this head to be instructed with the crown lowered to give 7/1 c.r. with a C & A washer. Possibly when we get the first of the high compression ratios through we shall see whether this casting will do the job. Otherwise we shall have to make a special length of valve. This will not matter much as being larger inlet valves they are already special. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||