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).
No.2 Ramp Head Report and the effects of engine modifications on gas flow.
| Identifier | ExFiles\Box 133\2\ scan0111 | |
| Date | 8th December 1934 | |
| x1093 TO Hs{Lord Ernest Hives - Chair}/SD. Copy to Mr. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} E/PSN.2/MN.8.12.34. Rm{William Robotham - Chief Engineer} Re No.2 Ramp Head Report. Hs{Lord Ernest Hives - Chair}/Wd{Mr Wood/Mr Whitehead}/CHP.1/GB.1/11/34. With reference to the curves shown on sheets 7 and 8 of the above report dealing with the effect of orifice coefficient with the 1.6 diameter inlet valve, it does not seem legitimate to us to do each series of tests with exactly the same timing. The effect of small modifications such as removing the inlet gate boss and increasing the trepanning in the cylinder head will be to modify the gas flow to some extent as is shown clearly by the curves themselves. Thus if the timing is altered slightly to give the best results with each modification, it would then be easy to assess the ultimate effect of the modification on the breathing capacity of the engine. E/PSN. | ||