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).
Distribution experiments for a Marmon engine's intake manifold.
| Identifier | WestWitteringFiles\J\March1923\ Scan18 | |
| Date | 15th March 1923 | |
| REPORT. MARMON ENGINE. DISTRIBUTION EXPERIMENTS. Marmon pipe. 6 5 4 3 2 1 Dia = 1.700" HEATER CARBURETTER With Stromburg carburetter. Distribution fairly good at low speeds but cylinders 1 and 6 were rich, 4 & 3 being the weakest. Distribution much more uniform with 'heater' in action. Engine would give steady torque at 500 r.p.m. with or without heater. Much more uniform charge in each cylinder at speeds above 1000 r.p.m. With U.S. Carburetter. Without exhaust heater, cylinders 6 and 1 very rich at speeds from 500 to 1000 r.p.m. whilst cylinders 4 and 3 were weak. Would not pull steady torque below 1000 r.p.m. and upon slightly enriching mixture cylinders became so rich that misfiring took place. Upon cutting down mixture, cylinders 4 and 3 'cut out' through too weak a mixture. contd:- | ||