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 a Twin Zenith carburettor against a standard chassis carburettor with different camshafts.
| Identifier | ExFiles\Box 5\4\ 04-page242 | |
| Date | 21th June 1939 | |
| TWIN ZENITH CARBURETTER ON 'JAPAN' COMPARISON WITH STD CHASSIS CARBURETTER. ZENITH USED WITH 26 m/m CHOKES - SMALL BORE HOT PIPE - 112° & 116° CAMSHAFTS - 5.25/1 COMPn RATIO. OPEN EXHAUST. V869 B.H.P. B.M.E.P. lb/sq. in. R.P.M. 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. 21.6.39 | ||