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).
Comparing compression ratios for the Phantom, 20/25, and Peregrine engines, with an instruction to alter it for future production.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page053 | |
| Date | 25th July 1932 | |
| 84027. To E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}8/MJ.25.7.32. PER. COMPRESSION RATIO. The highest compression ratio we have run on the Phantom is 5.25. The standard 20/25 is 5.7. The results shew that the Peregrine is to be able to stand the 6.10 C.R. At the moment the compression ratio of Peregrine with the standard gasket is 5.85 only. Will you please issue instruction to alter the C.R. of all heads produced from now onwards. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||