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 C.I. and L.B.I. carburetter needles on a Bentley 56. BN, focusing on performance and fuel consumption.
| Identifier | ExFiles\Box 83\4\ scan0011 | |
| Date | 22th October 1935 | |
| x280a HOTEL DE FRANCE. CHATEAUROUX. Indre. France. GWH{George W. Hancock - Head Chateauroux}/8/JAB. 22nd October 1935 To. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From. G.W.H. BENTLEY 56. BN.{W.O. Bentley / Mr Barrington} We have carried out the following first test with the Carburetter needles sent out. Petrol Consumption taken over a distance of 194 Miles. C.I. NEEDLES 12.6 MPG. Average Speed..59.7 MPH. L.B.I.NEEDLES 13.28 MPG. Average Speed..58.5 MPH. C.I.NEEDLES. Maximum speed on Salbris straight approximately 15 miles, 98 MPH outwards and 100 MPH. inwards. Cut-out open. L.B.I.NEEDLES. Maximum speed on same stretch of road 99 MPH. outwards and 101 MPH. inwards. Cut-out closed. L.B.I.NEEDLES. Give an improved acceleration from 30 MPH. direct drive over the C.I.Needles, slow running more even and Engine less inclined to stop after deceleration. Other tests to follow. The Engine does not foul anywhere to cause roughness. It is however the old standard mounting with rubbers under the rear feet, and also foot pedal brake anchorage mounted in Gearbox. Rubber mounting is to be attended to. -------------- G.W.Hancock G.W.H. | ||