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 power output with a 5.25 compression ratio using various carburetor and intake setups.
| Identifier | ExFiles\Box 155\1\ scan0037 | |
| Date | 19th July 1932 guessed | |
| COMPARISON OF POWER OUTPUT WITH 5.25 COMP RATIO R.M.P. 54 1 1/4" CAMSHAFT (E.{Mr Elliott - Chief Engineer} 82448) (LONG TYPE SILENCER COMPLETE) (DOUBLE VALVE SPRINGS) (STANDARD ROCKERS) ① STANDARD P II CARBS & INTAKE SILENCER ② SEMI-EXPANDING CARB AND INTAKE ③ 2 - 1 5/8 DIA S.U-CARBS BALANCED BY 1 1/4 DIA HOLE ④ SINGLE 2 1/2 BORE S.U-CARB B.H.P. B.M.E.P. LBS/SQ ' R.P.M. M.P.H. 11 X 41 AXLE 7 X 20" TYRES | ||