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).
M.E.P. curves for the Aspin valve engine compared to other naturally aspirated engines.
| Identifier | ExFiles\Box 144\4\ scan0088 | |
| Date | 2nd May 1940 | |
| file 1129 Sg.{Arthur F. Sidgreaves - MD} and Hs.{Lord Ernest Hives - Chair} from Rm.{William Robotham - Chief Engineer} c. E.{Mr Elliott - Chief Engineer} c. Rg.{Mr Rowledge} c. Wd.{Mr Wood/Mr Whitehead} c. Lr.{Mr Ellor} c. Lr{Mr Ellor}/Lov.{Mr Lovesey} Rm.{William Robotham - Chief Engineer}1/ML.2.5.40. ASPIN VALVE. As a supplement to Rm.{William Robotham - Chief Engineer}1/ML.1.5.40. we send you a few M.E.P. curves between the Aspin engine and other naturally aspirated engines (4-stroke.) with which we are familiar. These really are only a measure of the breathing of the engines and not of detonation, since exact information about the fuel is not available. We can say, however, that curve No: 5. would have been obtained without detonation down to 1,000 r.p.m. on 87 octane. We actually listened to the Aspin engine P.T.O. | ||