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).
Test results and comparison of cylinder head EB.4706, noting its performance for slow running, detonation, and compression ratio.
| Identifier | ExFiles\Box 124\2\ scan0285 | |
| Date | 17th December 1940 | |
| - 8 - Rm{William Robotham - Chief Engineer}/Tym.2/RH.{R. Hollingworth}17.12.40. We also tried another cylinder head EB.4706, some time ago, actually 27.6.39, sketch attached. This head was tried at L. Swindall's request for slow running andiidling, and our other observations were more or less of a casual nature. However, we found that it was as good as Exs.1383, for slow running, i.e; .006" tappet clearance better than EB.3844, but remarked that it was had for detonation, worse even than Exs.1383, and was inclined to roughen up the engine. Its compression ratio was 6:85:1, and the capacity 111 cc's. (Continued) | ||