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).
Report page discussing engine performance comparisons of the Ramp head, focusing on compression ratios and volumetric efficiency.
Identifier | ExFiles\Box 133\2\ scan0103 | |
Date | 19th November 1934 | |
(2) able to compare performance and detonation of the Ramp head at turbulence ratios of 1.56, 1.79 and 1.97. The effect of increasing compression ratio of the Ramp No.2 is in hand. The flange has been machined as much as possible, giving a C/R of 7.5/1; further increases can be obtained by special pistons without affecting the inlet valve. The check on volumetric efficiency with the multi-cylinder engine is noted and it is agreed that the induction system of the single cylinder is freer than the multi. Should, however, the single cylinder be de-tuned to give the lower volumetric efficiency of the multi, then it is suggested that the relative performances of the Standard and Ramp Heads will not be appreciably altered because they both exhibit the same ramming effect over the speed range 2000 - 4000 r.p.m. (sheet 1 of the report). ------------ Wd.{Mr Wood/Mr Whitehead} Hs{Lord Ernest Hives - Chair}/Wd.{Mr Wood/Mr Whitehead} | ||