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).
Summary of final running tests and development on a 4-stroke diesel unit, covering investigations into injector overheating and injection types.
| Identifier | ExFiles\Box 133\3\ scan0070 | |
| Date | 8th March 1939 | |
| Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}o/MH.{M. Huckerby}8.3.39. SUMMARY OF FINAL RUNNING ON 4-STROKE DIESEL UNIT. Introduction. The following covers development running from 6th. September 1932 to 15th. October 1933. Range of Investigation. (1) Power drops after short periods of running due to injector overheating. (2) Side Injection. (3) Combined fuel Pump and Injector. Conclusions. (1) If adequate cooling is not provided for the injector, power drops are experienced after short periods of load running. (2) Side injection is inferior to central injection by about 8 BMEP. (3) The combined fuel pump and injector are up to Bosch power provided the correct nozzle is used. No gain seems to be experienced from the reduced fuel line capacity. Injector Overheating. The original injector fitted to the modified cylinder did not fit the head accurately due to a machining error, and a bush was inserted. Trouble was experienced due to a fall off in power after running for a short period at full load. A new head was tried, correctly machined, but this had thick alum cooling walls in place of the thin copper tube fitted to the original cylinder, and did not cure the trouble. A copper tube was next fitted, and proved a complete remedy. | ||