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 an 8-litre engine against a 7.6-litre unit, mentioning power output and acceleration.
| Identifier | ExFiles\Box 92\2\ scan0190 | |
| Date | 13th December 1933 | |
| To Sg.{Arthur F. Sidgreaves - MD} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} C. Wcr. E.{Mr Elliott - Chief Engineer} C. Ry. Rh.{R. Hollingworth} C. Ev.{Ivan Evernden - coachwork} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}9/KT.13.12.33. 8 LITRE ENGINE. Referring to Sg{Arthur F. Sidgreaves - MD}7/E12.12.33. The 165 B.H.P. in our memo referred to the 7.6 litre unit. We attach a curve shewing a direct comparison between the power unit we are putting in the Vulture and the units fitted in M.Y. chassis. Since we have the same valves in the 8 litre engine as in the 7.6 litre we get very little more top power under similar conditions, the gain shewn on the attached curve being largely due to the bigger carburetter and high compression ratio, i.e. fit these to the M.Y. engine and we should get at least 185 B.H.P. Where the 8 litre engine will always score over the 7.6 litre is in improving the cars acceleration at intermediate speeds by about 5% for the same degree of roughness. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||