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).
Piston crown design, discussing detonation prevention by referencing a Vauxhall design and a quote from 'Autocar' magazine.
| Identifier | ExFiles\Box 148\1\ scan0032 | |
| Date | 16th December 1938 | |
| -2- RM{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}10/JH.16.12.38. remaining area of the piston crown. It is interesting to remember, that the design of cylinder head evolved by Mr. Alex Taub of Vauxhall Motors in conjunction with a special piston crown is claimed to do just what we think our new piston is doing. To quote from a recent issue of the 'Autocar' .... when the flame has spread through say 90% of the mixture, the remaining 10% may spontaneously ignite from pressure and temperature. Vauxhall pack this 10% into a narrow space which gets bigger as the piston descends, thus the local pressure is reduced and detonation prevented . Conclusions. As soon as we obtain our further supply of pistons, our tests will be continued and direct comparison made with our usual flat top piston. RM{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||