Performance graph comparing different configurations of a 1 5/8 inch SU carburettor on a standard 25 HP cylinder head.
| Identifier | ExFiles\Box 31\5\ Scan150 | |
| Date | 7th March 1934 | |
| No 2. UNIT C XIII SPEC: RHC {R. H. Coverley - Production Engineer} /WSS 19.AP & 12.33 1 5/8" SU CARBURETTOR ON STANDARD 25HP CYL. HEAD COMP. RATIO 5.7:1 STD. BENTLEY CAMSHAFT. OPEN EXHAUST. (1) INDUCTION PIPE HS {Lord Ernest Hives - Chair} 1 CARBURETTOR BOLTED STANDARD WAY UP. DIRECTLY ON PIPE (2) DITTO. INVERTED. (3) CARB. TO LEC 3638 ON OPPOSITE SIDE OF ENGINE. 1.200 HOLE THROUGH BLOCK. B.H.P. R.P.M. DEPRESSION - INS. HG. B.M.E.P. - LBS. D' | ||
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).