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).
Graham petrol consumption tests comparing fuel efficiency with and without suction ignition advance.
| Identifier | ExFiles\Box 126\1\ scan0199 | |
| Date | 7th February 1935 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Hs{Lord Ernest Hives - Chair}/Smth. X4707 Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies}16/KW.7.2.35. Graham Petrol Consumption Tests. 1st Test. Consumption with engine running light at 35 MPH: Suction ignition advance working = 17.6 M.P.G. " " disconnected 17.2 " 2nd Test. Driving as hard as possible. Suction ignition advance working = 13.4 M.P.G. " " disconnected 13.4 " These tests have been carried out between Derby and Loughborough using the same route direction for each comparative test. Petrol used was a measured gallon from a gravity tank. The speed of 35 M.P.H. was taken as this is the speed equivalent to the maximum ignition advance. Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies} | ||