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 carburetter against a standard chassis carburetter on the 'Japan' engine configuration.
| Identifier | ExFiles\Box 56\2\ Scan171 | |
| Date | 22th May 1930 | |
| TWIN ZENITH CARBURETTER ON "JAPAN". COMPARISON WITH STD CHASSIS CARBURETTER. ZENITH USED WITH 26 m/m CHOKES - SMALL BORE INDN PIPE - 112° & 116° CAMSHAFTS - 5.25/1 COMPN RATIO. OPEN EXHAUST. B.H.P. B.M.E.P. R.P.M. TWIN ZENITH 112° CAMSHAFT TWIN ZENITH 116° CAMSHAFT 112° TWIN CARBS. STD CHASSIS CARB. 116° CAMSHAFT STD CHASSIS CARB. 112° CAMSHAFT 116° TWIN CARBS. 112° 20HP CARB. 116° 20HP CARB. aeh 22.5.30 | ||