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).
The wear analysis of aluminium pistons from a Shop Car after 33,000 miles.
| Identifier | ExFiles\Box 35\2\ scan 242 | |
| Date | 28th October 1920 | |
| X2748 To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to Bn.{W.O. Bentley / Mr Barrington} c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} Hs{Lord Ernest Hives - Chair}9/LG28.10.20. X.2748. RE ALUMINIUM PISTONS. We have altely removed a set of aluminium pistons from the Shop Car at the works. These pistons are the original trunk type solid pistons. They have run on the car for 33,000 miles. We find on the fitting portion of the pistons the average wear is .002". On the cylinder bores we find that the average wear is .006". The wear has occurred on the part of the cylinder traversed by the rings. There is no appreciable wear on the ring grooves. The maximum wear we can measure in the gudgeon pin holes if the piston is .0005". As these pistons have run longer than any other aluminium pistons we have had, we give this information to show that there is no excessive wear on the aluminium pistons or in the ring grooves or in the gudgeon pin hdes. The wear on the cylinder bores is about the standard amount we get after similar mileage. The oil used on this Car was Prices'. Hs.{Lord Ernest Hives - Chair} | ||