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).
Graph comparing cylinder pressure and exhaust stub pressure with advanced valve timing at 3000 rpm.
| Identifier | ExFiles\Box 134\1\ scan0075 | |
| Date | 24th January 1938 guessed | |
| Press. in exhaust stub. 3000 rpm. Full throttle. INDUCTION B.D.C. Press. in Cyln. EXHST. -> B.D.C. T.D.C. Atmospheric +4 lb/in² +2 -2 -4 lb/in² Valve timing all advanced 20°, giving exhaust closing at T.D.C. Note that the pressure in the cyln. rises to 2 lb/in² over atmospheric while the exhst pipe press. is below atmospheric. With normal timing, exhst closing 20° late the press. in the cyln. was generally approx. same as in exhst stub. Fig 1. | ||