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).
Testing and standardisation of modified aluminium split pistons.
| Identifier | ExFiles\Box 77\3\ scan0166 | |
| Date | 8th April 1920 | |
| R.R. 235 A (100 T) (S F.{Mr Friese} 846, 6-8-19) (G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460. X.3751 To CJ. from Hs.{Lord Ernest Hives - Chair} c. to R.{Sir Henry Royce} c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}1/LG8.4.20. X.3751 - RE MODIFIED ALUMINIUM SPLIT PISTONS. The standardisation of the above pistons has been agreed to by everybody except Mr. Johnson whose remarks were - "Proceed with expenditure but do not standardise until 10,000 miles have been run". A set of these pistons has now completed 10,000 miles on 2 EA car, a second set has completed 9,000 miles and a third set has completed 7,000 miles. The condition of these pistons after this amount of running is that they are free from piston knocks either when hot or cold. They are, in this respect, an advantage over the split aluminium pistons we are at present using. As the necessary standardisation test has been carried out, we have recommended the works to use these pistons as soon as convenient. These pistons have gudgeon pin knocks (elusive knocks) but they are, in this respect, no worse than those we are using. Hs.{Lord Ernest Hives - Chair} | ||