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).
Comparison of performance and engine smoothness between the EB.3844 and Exs.1383 heads.
| Identifier | ExFiles\Box 124\2\ scan0284 | |
| Date | 17th December 1940 | |
| - 7 - Em/Wym.{G. Harold Whyman - Experimental Manager}S/RH.{R. Hollingworth}17.12.40. The performance of this head is practically the same as the 6:25:1 comp ratio head. The increase in comp ratio however, in the EB.3844 head does not seem to affect engine smoothness as does the Exs.1383 head. (Continued) | ||