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).
Extract detailing the testing of new aluminium pistons for the 40/50 HP chassis.
| Identifier | ExFiles\Box 35\2\ scan 031 | |
| Date | 26th November 1918 | |
| X 2748 X.2748 X.3400 Extract from R4/G261118. 1000 - 40/50 H.P. CHASSIS (9) PISTONS. It is assumed that we are testing aluminium pistons made in Mr. Hall's alloy, of the special design lately sent from here, which had the lower of the upper rings made into the scraper ring, so as to leave a full surface of the aluminium well lubricated. The piston demanded a shorter connecting rod, which we think will be found advantageous, owing to the fact that the thrust of the piston is brought to a diameter which should not change its dimensions nearly so much as in the case of the old piston. This lower part of the piston being extra well oiled, is expected to be free from wear. It will be as well to keep the connecting rods back for a long duration test, half the engine being fitted with the next best piston, or one the wearing qualities of which are known. | ||