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).
Analysis of power and compression ratios for the F.2.B. series low compression engine.
| Identifier | ExFiles\Box 69\4\ scan0249 | |
| Date | 1st June 1928 | |
| BJ. from Hs.{Lord Ernest Hives - Chair} c. to Wor.{Arthur Wormald - General Works Manager} PN.{Mr Northey} c. to CWB. EP.{G. Eric Platford - Chief Quality Engineer} c. to C. Mx.{John H Maddocks - Chief Proving Officer} Y8770 POWER - F.2.B. SERIES. X.790 X.7771 X.7770 We do not anticipate that there will be any appreciable increase in power on the F.2.B. series low compression engine. The average compression ratio of the present standard Phantom is 4.12/1. The average compression ratio of the low compression F.2.B. engine which we have measured is 4.2/1. The anticipated increase in power with this alteration in compression is no more than 1%, so therefore we cannot expect any increase in performance. The advantage with F.2.B. series is that we can, if we are prepared to sacrifice a certain amount of smoothness, increase the compression ratio without having excessive detonation. With the two types of head - high and low compression - we can get any compression ratio from 4.25/1 to 5/1. Hs.{Lord Ernest Hives - Chair} | ||