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).
Engine performance tests, valve overlap, and safety fuel characteristics.
| Identifier | ExFiles\Box 173\2\ img265 | |
| Date | 4th March 1934 guessed | |
| They have had 174 B.M.E.P. with 7-9 c/r and 2 ins Hg boost using the 130° overlap. This with a Consumption of .51 LBS/BHP/Hr. at 1750 R.P.M. on a cylinder of 5.5" bore and 6" stroke. The slow running and starting difficulties have been increased by the overlap but they have solutions and have idled at 150 R.P.M. with 112° overlap when the throttle valve was close to the inlet valve. The safety fuel has an octane of at least 90 without lead they still assert and in fact give it 95 using a series 30 Ethylene Gas Corp test engine operated 600 R.P.M. with Coolant 600°F.{Mr Friese} (Its flash point is 125°F Cleveland Open Cup Method) Obviously the whole thing wants carefully comparing with what we can do now with our normal engine before one can decide whether the developement is worth while but the N.A.C.A. report 471 gives | ||