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).
The incorporation of vent plugs to reduce porosity and scrap in cylinder block castings.
| Identifier | ExFiles\Box 8\6\ 06-page12 | |
| Date | 30th September 1937 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/AP.30.9.37 The incorporation of the vent plugs similar to those shown on ECD.90 is largely responsible for the improved cylinder blocks from a casting point of view as now produced in the Works with an appreciable reduction in percentage scrap. When casting, these vent plug holes release the gasses and to a great extent overcome the porosity hitherto experienced in our cylinder blocks. The actual modification ECD.90 is a machining modification to the vent plugs already in existence. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||