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).
Performance and petrol consumption test results comparing a Duplex Stromberg and 3 SU carburettors on a Bentley 11 BI car.
| Identifier | ExFiles\Box 170\1\ img078 | |
| Date | 30th May 1940 | |
| EV{Ivan Evernden - coachwork} CG JNR{Charles L. Jenner}/BCTS 6 copies please 30-5-40. Bentley Car 11 B I Unit B80 No 3L + Lagonda file We have carried out our performance and petrol consumption tests on 11 B I car with a Duplex Stromberg carb fitted, and alternatively 3 S.U. carbs. With regard to performances, we could not pick any difference in acceleration times from 10 - 80 MPH with either system of carburetters, but using 4 B 60 as a datum car, we were able to establish that the performances of the Stromberg and the 3 S.U.'s were identical from 10 - 60 MPH, but from 60 - 85 MPH, the 3 S.U.'s were better by 2 to 3 car lengths, and as far as we could judge on the road progressively so up to 100 MPH. The actual timed figures obtained were:- 10 - 20 MPH = 3.1 SECS. 10 - 30 " = 6.1 " 10 - 40 " = 9.1 " 10 - 50 " = 12.7 " 10 - 60 " = 16.5 " 10 - 70 " = 20.2 " 10 - 80 " = 25.4 " | ||