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).
Standardisation document for a split, oval-ground piston designed for uniform flexibility to eliminate piston knocks.
| Identifier | ExFiles\Box 171\3\ img020 | |
| Date | 22th November 1919 | |
| R.R. 755 (5 H) (S.P. 621. 2-5-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2381. STANDARDISATION of CHASSIS PARTS. ORIGINAL 107212 Description of Parts. Split Piston. Oval ground, split axially and circumferentially giving uniform flexibility on the whole length of fitting portion. Origin. The elimination of piston knocks. COMPLETED 10.12.19. Experimental Test Report. Extract from EH1/LG71119. These pistons have run 100 hours on the bench test. From the results of tests we consider it is quite safe to use these split type pistons until we have proved the Ram type piston. Road Test Report. See EP{G. Eric Platford - Chief Quality Engineer}9/F18.11.19. attached. Signature of Exp. Dept. that above is correct. (Sgd.) E.{Mr Elliott - Chief Engineer} Hives. Weight of Old Part. Cost of Old Part. £ Weight of New Part. Cost of New Part. £ Difference per Car. Difference per Car. £ Cost of Parts in Works and Stores which will be scrapped if commenced on:- Series............£ Series............£ Storekeeper advised re above. Storekeeper's Signature. Signature of Mr. DeLOOZE that above is correct. SIGNATURES | DATE | REMARKS Mr. JOHNSON. | 8.12.19. | Agreed, subject to Bn{W.O. Bentley / Mr Barrington}7/W61219. Mr. ROYCE. | 29-11-19 | Agreed. That these are the best we have tested & that all pistons will have some slight defects & it is better to have these. Mr. WORMALD. | 24-11-19 | Agreed, they are the best we have tested so far. Mr. NADIN. | | Mr. PLATFORD. | 24.11.19. | Agreed, until Ram piston developed which should be pushed. EP.{G. Eric Platford - Chief Quality Engineer} See EP{G. Eric Platford - Chief Quality Engineer}9/F181119 Mr. NORTHEY. | 24.11.19. | Agreed. PN.{Mr Northey} Mr. BAILEY. | 24.11.19. | Agreed as above. By.{R.W. Bailey - Chief Engineer} Mr. BARRINGTON. | 24.11.19. | Agreed, to be used as a "bridge" until something better is proved. Bn.{W.O. Bentley / Mr Barrington} Mr. DAY. | 24.11.19 | Agreed. Da.{Bernard Day - Chassis Design} [Handwritten note in right margin]: A sample was brought out to the experimental shop. HHP | ||