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).
Modifications to the cylinder head LeC.5222 for the 25/30 HP engine.
| Identifier | ExFiles\Box 103\4\ scan0186 | |
| Date | 3rd December 1936 | |
| 519 To E.{Mr Elliott - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. to By.{R.W. Bailey - Chief Engineer} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/AP.3.12.36. 25/30 HP. The cylinder head LeC.5222 incorporated the following special features:- (a) Lowered water cooling round the exhaust valve guides. (b) Removing the restriction in the end inlet ports. From our tests, we have issued a memo condemning (a), but in view of the slight increase in power (b) should be included in the standard 25/30 head for Production as soon as convenient. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||