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).
Improvement of volumetric efficiency and flow through high power engine inlet valves and ports.
| Identifier | ExFiles\Box 124\2\ scan0391 | |
| Date | 15th January 1944 | |
| 1044 To: Jnr.{Charles L. Jenner} from Rm.{William Robotham - Chief Engineer} Rm.{William Robotham - Chief Engineer} 3/h.{Arthur M. Hanbury - Head Complaints} 15.1.44. c. to FJH.{Fred J. Hardy - Chief Dev. Engineer} c. to FJH{Fred J. Hardy - Chief Dev. Engineer}/CTS.{C. Trot Salt - Carburation} FLOW THROUGH HIGH POWER ENGINE INLET VALVE AND PORT. We have always been very disappointed with the power output of the high power head based on the ratio of the inlet valve area to the piston area. It only equalled the figure of merit for Tressillian's overhead cam shaft engine. Volumetric efficiency becomes increasingly important when we use petrol injection and restrictions due to the choke disappear. The trend towards hydraulic torque convertors of some description suggests that we shall be able to use cam shafts giving better top power at the expense of low-speed torque. Both these trends suggest a brief research into any possible means of improving the volumetric efficiency of the high power range of engines. The work can be carried out on the 3¼ bore 4-cylinder engine, as being the most economical test unit, and if you will correlate the existing information both at Derby and in the S.A.E. Journal which I mentioned to you, we will have a discussion and agree what sort of heads we should make for experiment. Rm.{William Robotham - Chief Engineer} | ||