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).
Test report comparing an S.U. carburetter against a standard R.R. model, detailing road performance, fuel consumption, and piston positions.
| Identifier | ExFiles\Box 31\4\ Scan073 | |
| Date | 4th September 1931 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from F.{Mr Friese} Dodd. 4.9.31. TESTS ON S.U. CARBURETTER. Controls set on quadrant working as R.R. standard. Engine running light equal to R.R. answers to mixture lever control as R.R. standard., building up in strong position and falling off set weak. Road test. Slow running excellent at 4 m.p.h. Snap acceleration under the above conditions very good and equal to R.R. standard. Performance at 30 - 40 m.p.h. gives the impression of a weak mixture - we could improve the needle here perhaps. Consumption test. Taken with mixture lever set normal for 1 gall. gave 19 M.P.G. Average speed 40 M.P.H. Piston positions. Taken under running conditions on road. Were difficult to take but were approximately as follows :- 30 M.P.H. 40 M.P.H. 50 M.P.H. .265" .365" .570" - open. Consumption test on R.R. carburetter over 1 gall. same road conditions as S.U. carburetter - 19 M.P.G. | ||