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).
Chassis engine research and development for the Phantom III, specifically concerning cylinder valves and passages.
| Identifier | ExFiles\Box 161a\4\ scan0137 | |
| Date | 5th October 1936 | |
| S. and W. from E.{Mr Elliott - Chief Engineer} 2924 c. Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} RHe. Ba. E/JMR. E/Pen. E.1/HP.5.10.36. Chassis Engine Research and Development. Referring back to the first report E.1/HP.30.3.36, the following notes give the present position of chassis engine research and development as well as the proposed future policy. Phantom III. Cylinder Valves and Passages. The single cylinder engine to LeC.4538 has been made and run, and some preliminary results have been obtained. This promises greater power output with the larger valves and passages. Design department have investigated the difficulties on the main engine attendant to introducing these larger valves and passages with the present system of cylinder head studding, but have not yet completed their investigation. At the moment also design are looking into the possibilities attached to a system of studding, using only four studs per cylinder in connection with the four port head, mainly with the object of producing a cylinder head for facilitating production in the foundry. This same development however may short circuit any attempt to get larger valves in with the present six stud system, and hence the latter will follow on in the programme. Incidentally the four port change is also being used for obtaining improved oil drainage, and for testing out the modified valve gear, using carbon steel springs. A development is required for removing the turbulent lips from the combustion chamber but retaining the existing compression ratio, as has now been done on the 25/30 and Bentley engines, tests of which have now been made. This modification would render the head more easy to produce. | ||