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 of a cylinder head with double valve springs to reduce detonation.
| Identifier | ExFiles\Box 171\1\ img131 | |
| Date | 23th March 1928 | |
| RR 755 REVISED (10H) (DE 649 9-12-26) 5M. 2/1187. ORIGINAL COMPLETED 10.5.28 STANDARDISATION of CHASSIS PARTS. Date 23.3.28 Description of Parts. CYLINDER HEAD COMPLETE WITH DOUBLE VALVE SPRINGS. X No. 7050 Drawing No. E.76939 Part List Origin. To reduce detonation. Experimental Test Report. Fitted to 15-EX and ran 10,000 miles in France. Fitted to 14-EX and 10-EX ran 5000 and 8000 miles respectively on these cars. Road Test Report. Ran 10,000 miles in France. Detonation considerably reduced, increased power giving higher speeds and quicker acceleration. [X] A Scrap and replace at all cars, including Chassis already delivered to Customers. [ ] B Scrap and replace on Chassis in Works. [ ] C Scrap present stock and replace on all Chassis not yet handed to test. [ ] D Use existing stock Alteration effective on future Chassis. Weight of Old Part. Weight of New Part. Difference per Car. Cost of Old Part. £ 94.1.3 Includes alum. Inlet Pipe - sheet dated 26.3.28. Cost of New Part. £ 94.1.3 Difference per Car. £ Nil. Wor.{Arthur Wormald - General Works Manager} Cost of Parts in Works which will be scrapped if commenced on :- Series...........£........... Series...........£........... Series...........£........... Signature from Cost Dept that above is correct. G/Rb.{R. Bowen} 8.5.28. INITIAL | DATE | REMARKS BJ. | 10.5.28 | Agreed. | B.J. R.{Sir Henry Royce} | 26/3/28 | Agree. FHTS WOR.{Arthur Wormald - General Works Manager} | 24.3.28 | Agreed. | Wor.{Arthur Wormald - General Works Manager} RG.{Mr Rowledge} | 26.3.28 | Agreed. | RG.{Mr Rowledge} DA.{Bernard Day - Chassis Design} | 26.3.28 | Agreed. | Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 26.3.28 | Agreed. | BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 24.3.28 | Agreed. | EP.{G. Eric Platford - Chief Quality Engineer} Assume turbulent head (aluminium E.{Mr Elliott - Chief Engineer} | 28.3.28 | Agreed. | E.{Mr Elliott - Chief Engineer} PN.{Mr Northey} | | | CWB. | 4.4.28 | Agreed. | CWB. HS.{Lord Ernest Hives - Chair} | 23.3.28 | Agreed. | Hs.{Lord Ernest Hives - Chair} [Faint watermark text: PHANTOM] | ||