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 analyzing ramp head engine performance and spark plug positioning.
| Identifier | ExFiles\Box 134\1\ scan0114 | |
| Date | 23th December 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/MH.{M. Huckerby}23.12.38. Thus we disagree with Taub's theory as applied to this particular head. Regarding the non-detonating power (Curve c), these follow closely the above maximum power comparisons, each condition giving a similar power loss to avoid detonations. The above ramp head comparisons were all carried out with the plug in the "exhaust" position. Curve (d) however, shows the comparison between the plug in the exhaust position and moved to the side, nearer the centre of the combustion chamber and the inlet valve. No 2d RAMP HEAD 6.6:1 RATIO PLUG IN SIDE As proved on other types of heads (No.5) the ramp head also gives the same result, i.e. moving away from the "exhaust" position gives an increase in power, both maximum and non-detonating and as shown on curve (d) amounts to 6 MEP or approx. 5% | ||