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 results for an S.U. carburetter with plain bonnet, detailing performance with strong and weak mixtures, and petrol consumption tests.
| Identifier | ExFiles\Box 29\3\ Scan340 | |
| Date | 13th August 1931 guessed | |
| -2- S.U. Carburetter with plain bonnet. Strong mixture. | Air Temp. | Water Temp. | Lap Time | Lap Speed MPH. | 1/2 mile time | 1/2 Lap mile speed. | |---|---|---|---|---|---| | 20° | 84.5° | 2-26.8 | 67.85 | | | | 20° | 84.5° | 2-26.6 | 67.94 | | | S.U. carburetter with plain bonnet. Weak mixture. | Air Temp. | Water Temp. | Lap Time | Lap speed MPH. | 1/2 Lap mile time | 1/2 Lap mile speed. | |---|---|---|---|---|---| | 20° | 84.5° | 2-29.2 | 66.76 | 26.8 | 67.16 | | 20° | 84.5° | 2-30 | 66.39 | | | Petrol consumption tests (Derby to Brooklands). Carried out on standard carburetter 25 HP. 148 miles 7 galls. petrol used = 21.1 M.P.G. (Brooklands to Derby) Petrol consumption test. Carried out on S.U. carburetter, set full weak on control lever. 152 miles. 9 galls. petrol used = 17 M.P.G. Engine Unit C.7. 110° camshaft Std. C/R.{Sir Henry Royce} Std. 25 HP. exhaust system E.55794 arrgt. Std. R.{Sir Henry Royce} series radiator with undented tubes. F.{Mr Friese} Dodd. | ||