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).
Recommendation and use of Ethyl petrol in Bentley cars, including notes on sparking plugs and engine detonation.
| Identifier | ExFiles\Box 150\1\ scan0114 | |
| Date | 23th May 1936 | |
| X1282 To Hd.{Mr Hayward/Mr Huddy} from Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6/KW.23.5.36. Ethyl Petrol for Bentley Cars. With reference to Hd{Mr Hayward/Mr Huddy}/SB.{Mr Bull/Mr Bannister}5/HR.21.5.36. Ethyl petrol is now going to be recommended in the instruction book. We have improved the sparking plug which is being supplied with the Bentley, and are satisfied that this is O.K. with Ethyl. The rest of the engine unit is specifically designed to stand up to Ethyl. We have no confirmatory evidence that an engine detonates worse after Ethyl has been used than it would if Ethyl had never been put into the car; in fact quite the contrary. We are issuing a further Depot Sheet on the subject. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||