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).
Carburetter performance tests at Brooklands comparing standard and S.U. carburetters with different bonnet types.
| Identifier | ExFiles\Box 31\4\ Scan064 | |
| Date | 6th August 1931 | |
| COPY. 81487. To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from F.Dodd. 6.8.31. X.788. X.1487. X.5080 CARBURETTER TESTS AT BROOKLANDS ON 12-GIV. Standard carburetter with louvred bonnet. Air Temp. Water Temp. Lap time Lap Speed MPH. 1/2 lap mile Time 1/2 lap mile Speed 19º 73.5º 2-32.6 65.26 27.4 secs. 65.69. 19º 74º 2-32 65.52 19º 73.5º 2-31.2 65.87 Standard carburetter with plain bonnet. Air Temp. Water Temp. Lap Time Lap Speed MPH. 1/2 lap mile Time 1/2 lap mile Speed 19º 82º 2-31.4 65.78 27.4 secs. 65.69 19º 81.5º 2-31.4 65.78 S.U. Carburetter with louvred bonnet. Air Temp. Water Temp. Lap Time Lap Speed MPH. 1/2 lap mile Time 1/2 lap mile Speed 20º 76º 2-27 67.76 26.4 secs. 68.18 20º 76º 2-26.4 67.57 This test the carb. jet was set strong, 13º on marking Air Temp. Water Temp. Lap Time Lap Speed MPH. 1/2 lap mile Time 1/2 lap mile Speed 20º 76º 2-28.8 66.94 - - This test the carb. jet was set in weak position. | ||