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 complete with double valve springs to reduce detonation.
| Identifier | ExFiles\Box 14\3\ Scan010 | |
| Date | 23th March 1928 | |
| RR 755 REVISED (10H) (DE 649 9-12-26) BM. 2/1187. STANDARDISATION of CHASSIS PARTS. COMPLETED 10.5.28 Date 23.3.28 No. 7050 Drawing No. E.76989 Part List Description of Parts. CYLINDER HEAD COMPLETE WITH DOUBLE VALVE SPRINGS. 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. Side Box Options: A Scrap and replace at all costs, 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. Includes Aluminium Salvage £14-1-3 Cost of New Part. The same as that dated 26/3/28. £14-1-3 Difference per Car. £ Nil Signature from Cost Dept. that above is correct. GTRL 10/4/28 Cost of Parts in Works which will be scrapped if commenced on :- Series...........£....... Series...........£....... Series...........£....... Approval Table: INITIAL | DATE | REMARKS BJ. | 10.5.28 | agreed BJ R.{Sir Henry Royce} | 26.3.28 | Agreed. FHR. 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 (alum:) 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} Stamp across document: PHANTOM II | ||