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).
Petrol consumption for the 'U' series chassis, testing various choke valve settings.
| Identifier | ExFiles\Box 147\5\ scan0062 | |
| Date | 15th May 1925 | |
| H.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No: 459 REF: Hs{Lord Ernest Hives - Chair}1/LG15.5.25. To BJ. from Hs.{Lord Ernest Hives - Chair} c. to CWB. c. to H.{Arthur M. Hanbury - Head Complaints} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Hm.{Capt. W. Hallam - Head Repairs} c. to BY.{R.W. Bailey - Chief Engineer} 'U' SERIES CHASSIS. X459 PETROL CONSUMPTION. 4920 We have carried out tests on a standard 'U' series car and have obtained the following consumptions :- (1) With the choke valve in the down pipe adjusted correctly - 30 m.p.h. 16 m.p.g. 40 m.p.h. 15.06 m.p.g. Taken on a level road - each way readings. (2) With the choke valve in the exhaust disconnected from the throttle and set in the fully open position. (We know under this condition the choke valve offers no obstruction whatever). 30 m.p.h. 15.32 m.p.g. 40 m.p.h. 14.4 m.p.g. The reduction in the petrol consumption would be accounted for by the fact that there would be very little heat going to the throttle which would affect the distribution. (3) We made a further test, purposely adjusting the choke valve incorrect, so that instead of being open 90°, it was only open 60° when the throttle was full open. The consumption in this case was - 30 m.p.h. 14.26 m.p.g. 40 m.p.h. 13.6 m.p.g. We attach herewith a sketch which shows the correct setting of the valve. We suggest that this information should be distributed so that in case of trouble this point could be checked. Hs.{Lord Ernest Hives - Chair} | ||