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 non-homogeneous fuel mixture supply and petrol spray paths in an engine manifold.
| Identifier | ExFiles\Box 32\5\ Scan214 | |
| Date | 10th April 1923 guessed | |
| contd:- -2- Cylinders 6, 5 and 4 were richer than 3, 2 and 1 owing to the position of the carburetter - as shown in sketch. Carburetter was reversed and cylinders 3, 2 and 1 were then richer than 6, 5 and 4. Sketch showing probable path of petrol spray. The velocity of a gas flowing through a pipe is greatest at the centre as shown by curve in sketch below. From this it is to be expected that considerable amount of petrol will collect at A and B and petrol thrown against C and D, will drop back again into the main air stream and be carried either into cylinders 4 and 3 or into 6 and 5. Another probable cause of non-homogeneous mixture supply is the surging in the manifold caused by rapid closing of the inlet valves. High velocity in manifold is necessary to prevent precipitation of the heavier fractions of the fuel but on the other hand large capacity pipe tends to damp out pulsation. Hs{Lord Ernest Hives - Chair}/ A.C.L. | ||