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).
Power test graph for the 8.1 litre Phantom engine comparing different carburetor and cylinder head configurations.
| Identifier | ExFiles\Box 92\2\ scan0168 | |
| Date | 17th October 1933 guessed | |
| 8.1 LITRE PHANTOM POWER TESTS (PH NO 25) STANDARD CYLINDER HEAD (E.82758) - COMP RATIO 5.5:1 CAMSHAFT (E.82448) - R.R. LEAD BRONZE BEARINGS H.S. 1191 LARGE SEMI-EXPANDING CARB (LEC 3432) (NO INTAKE) STD. PRODUCTION 2 - 1 7/8 SU. CARBS (NO INTAKES) MANIFOLDS BALANCED BY 1.25 DIA HOLE B.H.P. R.P.M. M.E.P. (LBS/IN^2) TIMING .020 CL'CE I.O. 6° BTDC E.O. 58° BBDC I.C. 48° ABDC E.C. 7° ATDC INDN DEPN INS. H2O V/S 4/O A/SS{S. Smith} 38 | ||