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).
Analysis of petrol consumption and throttle bias in relation to carburettor performance.
| Identifier | ExFiles\Box 123\1\ scan0082 | |
| Date | 27th January 1941 | |
| Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden}3/ET.27.1.41. - 4 - Give-and-take petrol consumption at an average 45 M.P.H. was unchanged. This provided two separate answers:- A.{Mr Adams} Unchanged fuel consumption shewed that part throttle distribution had not affected economy in spite of throttle bias. Distribution under steady part throttle conditions would certainly be worse with throttle bias. It seems therefore that you may have either bad part throttle distribution on pick up or at constant speed on the level (Note: Taub claims 5% difference between front and rear when climbing hills with low gas velocity. This would be improved by forward throttle bias). Whichever you choose the answer appears to be the same in M.P.G. B. The slight improvement in full throttle acceleration shewed that, as explained in item 1., too rich a mixture is probably provided during acceleration when the discharge tube is behind the float chamber. This diatribe is not for the purpose of proving that throttle bias is a good thing. It is to show that we can get away with it, and at the same time kill one of the fundamental misuses of the Stromberg carburettor. Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden} TAS{T. Allan Swinden} | ||