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).
Design of an inclined inlet valve high-power cylinder head for a single-cylinder unit.
| Identifier | ExFiles\Box 134\2\ scan0100 | |
| Date | 19th November 1936 | |
| URGENT 429 To BY.{R.W. Bailey - Chief Engineer} E/PSN.3/MN.19.11.36. Copy to RHC.{R. H. Coverley - Production Engineer} Rm.{William Robotham - Chief Engineer} De. Rm.{William Robotham - Chief Engineer}Edwards. CAR UNIVERSAL SINGLE CYLINDER UNIT. Inclined Inlet Valve High Power Head. We send you herewith Lec.5368 of an inclined inlet valve cylinder head to fit the existing and the dry liner cylinder block on the above unit. The existing cylinder head required a small ignition advance which would appear to indicate a high rate of pressure rise and a potentially rough engine. With the inlet valve in the vertical position it is not possible to make the throat between the cylinder and the combustion chamber much bigger to reduce the turbulence except by reducing the inlet valve size. One of the objects of the inclined inlet valve design is to overcome both the limitation on inlet valve size and the limitation on throat area. It also reduces the limitation on combustion chamber shape and enables a shape to be used which should give what Taub considers to be good volume distribution for smoothness. As some of the charge is now directed into the combustion chamber it may be possible to get steady running on a plug further away from the centre of the combustion chamber, which again is desirable from a smoothness point of view. It is proposed to follow up with a number of heads with varying combustion chamber shapes and plug positions. In detail the head follows generally the previous design and as many existing parts as possible are to be used. The 1.850" diameter inlet valve to RS.{Sir Henry Royce's Secretary}317 has already been instructed for another test and will also be used with this head. The positions of two of the water holes in the head have had to be altered and the block should be modified to RS.{Sir Henry Royce's Secretary}350 to suit. The dry liner cylinder block has been designed to suit both this and the original cylinder heads. | ||