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 graph comparing twin Zenith carburetters against standard chassis carburetters on the 'Japan' engine model.
| Identifier | ExFiles\Box 6\7\ 07-page096 | |
| Date | 29th July 1930 | |
| TWIN ZENITH CARBURETTES On 'JAPAN' COMPARISON WITH STD CHASSIS CARBURETTER. ZENITH USED WITH 26 m/m CHOKES - SMALL BORE IND. PIPE - 112° & 116° CAMSHAFTS: 5.25/1 COMP. RATIO. OPEN EXHAUST. V869 B.H.P. R.P.M. B.M.E.P. lbs/□'' TWIN ZENITH 112° CAMSHAFT TWIN ZENITH 116° CAMSHAFT STD CHASSIS CARB 116° CAMSHAFT STD CHASSIS CARB 112° CAMSHAFT 112° TWIN CARBS 116° TWIN CARBS 112° STD CARB 116° STD CARB Hick | ||