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).
Bench tests of a Micklewood 2-stroke engine, detailing its poor performance.
| Identifier | ExFiles\Box 54\4\ Scan047 | |
| Date | 25th September 1924 | |
| R.R. 493A (50n) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs {Lord Ernest Hives - Chair} /Rm {William Robotham - Chief Engineer} /LG4.9.24. MICKLEWOOD 2-STROKE ENGINE. We have carried out motoring and indicator tests on the bench with this engine, fitted with the makers' carburetter and timed as recommended by him. This engine would not exceed 700 r.p.m. under its own power, running light. At 500 r.p.m. it developed 1 1/4 H.P. under the best scavenging and ignition settings. The indicator work was therefore confined to the latter speed. We attribute the poor performance of the engine, as it stands, to :- (a) Poor mechanical efficiency and excessive pumping losses. (b) Restrictions on induction and scavenging due to Rotary Valve design. (c) Slow burning and poor maximum pressure of the charge. ----------------------------- contd :- | ||