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).
Performance and testing of stellited valves, particularly with high-lead fuel.
| Identifier | ExFiles\Box 88\4\ scan0140 | |
| Date | 6th September 1935 | |
| W/S - Cx.{Major Len W. Cox - Advertising Manager} x254 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}8/KW.6.9.35. Stellited Valves. Replying to Cx.{Major Len W. Cox - Advertising Manager}3/KW.3.9.35. The ideal test for these stellited valves is high speed running with a fuel having the maximum lead content. Now that lead is used in France the best cars to prove the valves are really the Paris Trials cars, and any customer's car which is known to be used for high speed Continental touring. Service results up to date indicate that the cars do not receive sufficient punishment to show up exhaust valve deterioration in less than about 25,000 miles. in England. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||