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).
Graph comparing the power output of balanced versus unbalanced twin carburettors.
| Identifier | ExFiles\Box 13\2\ 02-page150 | |
| Date | 29th October 1931 guessed | |
| COMPARISON OF POWER OUTPUT BALANCED & UNBALANCED TWIN CARBS. STANDARD CAMSHAFT VALVE LIFT .480 STANDARD HEAD 4.78 C.R TWIN CARBS 1 1/4 CHOKES EX IN .013 CL'CE 75 55 5 B.H.P. B.M.E.P. R.P.M. NORMAL TWIN CARBS TWIN CARBS HAVING 2" EXTENSION CARRYING A BALANCING HOLE OF 1.625 D RM.{William Robotham - Chief Engineer} P.30 | ||