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).
Comparing the performance of Eagle VIII and Eagle IX engine carburetters, proposing future improvements and investigating valve bounce.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan159 | |
| Date | 25th September 1924 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -6- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/TAG/LG26.8.25. These curves bear out the characteristic shewn in the others, when the Eagle Vlll. carburetters are fitted, of giving better power at low speeds, and that the Eagle Vlll. curves flatten out at high speeds and droops after 2050 r.p.m. has been reached. In the case of the Eagle lX carburetters the increase at high speeds is considerable. It would appear that the line of investigation to be followed would be with the idea of improving the power output at low speeds when the Eagle lX type carbs. and induction pipes are fitted. As high speed aero engines are, apparently, going to be the engines of the future, the Eagle lX. induction layout has much to recommend as will be seen by the foregoing curves, and incidently if the high speeds are to be adopted, experiments with camshafts giving a little more overlap might prove interesting. It is proposed to try out an induction system similar to that of the Condor lll and lV. engines on an Eagle. Indicator diagrams, especially of the light spring type, might be very useful in connection with the improvements on the induction system and will be taken at the first opportunity. More evidence could be collected that would probably help in explanation of the 'kink' spoken of earlier in this report. VALVE BOUNCE. Valve action was observed with the oscilloscope showed no bounce up to 2300 r.p.m. either with the inlet or exhaust valves. Seething and swaying in the springs was contd :- | ||