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).
Blueprint graph comparing the power output of balanced versus unbalanced twin carburettors.
| Identifier | ExFiles\Box 13\3\ 03-page355 | |
| Date | 15th October 1931 guessed | |
| RM.{William Robotham - Chief Engineer} P 30 COMPARISON OF POWER OUTPUT BALANCED & UNBALANCED TWIN CARBS STANDARD CAMSHAFT VALVE LIFT .460 STANDARD HEAD 4.78 C.R TWIN CARBS 1.4 CHOKES Circular Diagram Text: Ex IN SI 7.5 55 .013 Clce Graph Key: ------ NORMAL TWIN CARBS - - - - TWIN CARBS HAVING 2" EXTENSION CARRYING A BALANCING HOLE OF 1.625 D' Axis Labels: B.H.P. B.M.E.P. R.P.M. | ||