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).
Advantages of using aluminium pistons over cast iron to reduce engine detonation.
| Identifier | ExFiles\Box 77\3\ scan0261 | |
| Date | 17th October 1921 | |
| X.4224 17.10.21. Extract from R9/G17.10.21 X.4219 PISTONS. X.4224 As regards aluminium pistons, I think we should persever- ere with these, as they certainly should be lighter than cast iron, and less favourable to detonations. We find that they are fitted to such cars as the Essex, so that we think if they are a definite advantage they ought to be on an R.R. We do not regret that having fitted them to the 40/50 as we are sure it has enabled that engine to do better than it could possibly have done with the cast iron pistons. This especially refers to deton- ations which appear to be so bad with the present supply of petrol as to force us to lower compressions than are best for a good performance. R.{Sir Henry Royce} | ||