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 from the Brooklands tests comparing engine performance with different camshaft and carburettor setups.
| Identifier | ExFiles\Box 5a\5\ 05-page140 | |
| Date | 19th June 1931 | |
| SHEET I HS{Lord Ernest Hives - Chair} 402 BROOKLANDS TESTS. 19/6/31 LAP SPEED C.O. OPEN 18 G III 70-64 MPH 18 G IV 69-66 Upper Test Configuration: 18 G IV 35-7 CWTS JAPAN UNIT C/R 5.25 TWIN ZENITH 26MM CHOKES 112° CAMSHAFT OPEN EXHAUST Camshaft Diagram: T.O.C II, 49, 49 Lower Test Configuration: 16 G IV 31 B JAPAN UNIT C/R 5.25 46% LARGER R.R. CARB 110° CAMSHAFT OPEN EX Camshaft Diagram: 10°, Ex, 43, 34, O.I.S CLCE, CAR WT Axis Labels: Left Axis: B.H.P. Right Axis: B.M.E.P Bottom Axis: ENGINE R.P.M., ROAD SPEED M.P.H. | ||