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).
Different valve timing for the Sports Phantom to improve high-speed output, based on a Lorraine engine comparison report.
| Identifier | ExFiles\Box 5a\5\ 05-page046 | |
| Date | 23th April 1927 | |
| To Re. from E.{Mr Elliott - Chief Engineer} c. to BJ. HY.{Tom Haldenby - Plant Engineer} X5771 E1/M23.4.27. SPORTS PHANTOM. X.3588 X.5770 X.8060 X.5771 Referring to the report giving comparison of Lorraine output with output of 20 HP. engines under different conditions, R.{Sir Henry Royce} suggests that on the Sports Phantom or any other sports chassis, we should have a different valve timing, more suitable for output at high speed. It will be expected that some sacrifice of B.M.E.P. at lower speeds will be sustained by such an alteration, as will be seen from the Lorraine curve. E.{Mr Elliott - Chief Engineer} | ||