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).
Modification details for valve spring top and bottom washers on the 20 HP chassis.
| Identifier | ExFiles\Box 48\4\ Scan094 | |
| Date | 11th June 1923 | |
| Y4226 c. to Hs.{Lord Ernest Hives - Chair} BY/Shn8/DB.{Donald Bastow - Suspensions}11.6.23. RE 20 HP CHASSIS - VALVES & FITTINGS - SEC:5060. Under alteration No.7760/E, we have made the following modification to E.51088 - Valve Spring Top Washer and to E.50148 - Valve Spring Bottom Washer. .025-10 chamfer at 45°±2° altered to .050-15 chamfer. REASON. Mr Bailey's instructions to give increased valve lift when valve is open. (This modification doubles the existing clearance). Will you please instruct that any washers made should be modified as above before assembly. A.T.D. Order No. 50863. BY/Shn. [WATERMARK: DICKINSON BOND 1804 MADE AT CROXLEY] | ||