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).
Sluggish engine pick-up due to petrol pooling at the inlet port and a related casting issue.
| Identifier | ExFiles\Box 123\5\ scan0039 | |
| Date | 11th August 1938 | |
| BY......From RHC{R. H. Coverley - Production Engineer}/G.Mc. RHC{R. H. Coverley - Production Engineer}/G.Mc.1/FH.11.8.38. Further to my memo' refernce G.Mc.1/MJ.22.7.38. the following point may be the cause of sluggish pick-up. There is a slight well produced where the Inlet Port meets the valve seatings. On slow running I should expect a small pool of petrol to collect here. I have known cases however where this factor has been an advantage on pick-up, but usually it is the reverse, especially where the gas speed and surface area are comparatively slow and large. There is rather more pool actually in the sample casting than one would expect from the drawing, this is either due to the development of the curves or a local sinking. In either case I suggest this should be washed out in the core boxes. RHC{R. H. Coverley - Production Engineer}/G.Mc. | ||