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).
Page 2 of a report on the expansion and distortion of a 4¼ litre engine component.
| Identifier | ExFiles\Box 86\1\ scan0207 | |
| Date | 2nd July 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/WB.{Mr Brazier/Mr Bell}7/KW.2.7.36. 4¼ litre EB.2561. Expansion. This gave an average expansion of .0025", the minimum to maximum figures being .0002" to .0033"; a difference of .0031". Again there was a tendency to expand more at the crown (2), but diametrically the expansions were fairly consistent. Distortion. In this case also the main variation occurred in the skirt (X), giving a minimum to maximum variation of .0026" to .0021" on the diameter, a total of .0047". From these results therefore the majority of the distortion apparently took place when attaching the cylinder block to the crankcase, but these are overall figures. Considering the variation in diameter at any particular depth, the maximum distortion due to temperature in the case of the 3½ litre was not more than .0012", and .0019" in the 4¼ litre model. The maximum distortion at any particular depth due to tightening was still high, .0051" for the 3½ litre, and .0038" in the case of the 4¼ litre. Hs{Lord Ernest Hives - Chair}/W.Bell. | ||