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 comparison graph of Twin Zenith versus Standard Chassis carburetters with different camshafts.
| Identifier | ExFiles\Box 102\5\ scan0046 | |
| 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. CURVE LABELS: 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. AXIS VALUES: B.H.P.: 10, 20, 30, 40, 50, 60, 70, 80, 90 R.P.M.: 500, 1000, 1500, 2000, 2500, 3000, 3500 B.M.E.P.: 70, 80, 90, 100, 110, 120 ach 22.5.30 | ||