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 with a Standard Chassis carburetter on a 'Japan' engine using different camshafts.
| Identifier | Morton\M13.2\ img062 | |
| 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. V869 B.H.P. B.M.E.P. 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° 20HP CARB. 116° 20HP CARB. ael 22.5.30 | ||