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).
Performance results and design considerations for a supercharged Bentley engine.
| Identifier | ExFiles\Box 140\1\ scan0162 | |
| Date | 15th April 1935 | |
| x209 To Sg.{Arthur F. Sidgreaves - MD} and Wor.{Arthur Wormald - General Works Manager} from E.{Mr Elliott - Chief Engineer} E.9/HP.15.4.35. c. Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Smth. E/PSN. Supercharged Bentley. We are very interested in the results given in report Hs{Lord Ernest Hives - Chair}/Smth.12/KW.12.4.35 which indicate the following gain in B.M.E.P. over the speed range, as follows:- Speed. Gain in m.e.p. 1000 r.p.m. 8 lbs/sq.in. 1500 " 10 " " 2000 " 13 " " 2500 " 17 " " 3000 " 18 " " 3500 " 19½ " " 4000 " 19 " " 4500 " 17 " " These results indicate a substantial gain over the whole of the speed range. With regard to the question of design, our investigations show that it is impossible to find room for a downdraught carburetter, air silencer, etc. under the bonnet with any system in which the blower feeds over the top of the valve rocker cover. In the scheme we are working on the blower is on the induction side of the engine and feeds into a square exhaust heated elbow passing downwards into the centre of the manifold. This scheme should be an improvement on the one tested in position '2' by reason of:- (a) There should be no loading up. (b) The blower stream enters the elbow at right angles to CONTINUED:- | ||