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 5:1 compression ratio cylinder head for increased car performance.
| Identifier | ExFiles\Box 14\3\ Scan069 | |
| Date | 26th September 1931 | |
| RR 785 (10H) [8459, 24-10-30] 6/3185. X7050. COMPLETED 15.10.31. STANDARDISATION of CHASSIS PARTS. Date 26.9.31 X No. 7050 Drawing No. E.82168 Part List Description of Parts. 5 : 1 COMPRESSION RATIO CYLINDER HEAD. Origin. Increased performance of car. Experimental Test Report. Fitted to 25-EX for tests in France. Road Test Report. Fitted to 25-EX and ran 20,000 miles in France. It was entirely satisfactory - no undue detonation, engine was very smooth. Weight of Old Part. Weight of New Part. Difference per Car. Cost of Old Part. £ Cost of New Part. £ Difference per Car. £ negligible Signature from Cost Dept. that above is correct. CRH 12/10/31. GHS 12/10/31 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. Cost of Parts in Works which will be scrapped if commenced on:- Series.........£......... Series.........£......... Series.........£......... INITIAL | DATE | REMARKS SG.{Arthur F. Sidgreaves - MD} | 14-10-31 | Agreed SG{Arthur F. Sidgreaves - MD} R.{Sir Henry Royce} | 3.10.31. | Agreed FHR. WOR.{Arthur Wormald - General Works Manager} | 30.9.31. | Agreed Wor.{Arthur Wormald - General Works Manager} C. | 30.9.31. | Agreed C. RG.{Mr Rowledge} | 7.10.31. | Agreed Rg.{Mr Rowledge} DA.{Bernard Day - Chassis Design} | 2.10.31. | Agreed Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 30.9.31. | Agreed By.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 5.10.31. | Agreed - in conjunction with diamond mounting EP{G. Eric Platford - Chief Quality Engineer} E.{Mr Elliott - Chief Engineer} | 5.10.31. | Agreed AE. PN.{Mr Northey} | 30.9.31. | Agreed PN.{Mr Northey} HS.{Lord Ernest Hives - Chair} | | Agreed. | ||