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).
Comparison of fuel distribution and performance using different manifold and carburettor configurations.
| Identifier | ExFiles\Box 66a\2\ scan0127 | |
| Date | 1st August 1926 guessed | |
| contd :- -2- due to the centrifugal action, and continued to flow up the rear of the pipe in quite a thick stream. With the previous manifold using the Eagle carburetter, the fuel was seen to be sprayed uniformly up the feed pipe into the centre of the distributing pipe. Some of the fuel could be seen flowing up the walls of the pipe but it was uniformly distributed all round. It has been suggested that the Eagle carburetter gives a better 'pulverised' or sprayed charge than the Phantom but if this is so, its influence on the distribution of these engines is not appreciable. We have tried an Eagle carburetter on the standard induction system by attaching a suitable bend to the hot spot but found the distribution characteristics to be very similar to that with the Phantom carburetter. Another type of manifold was tried in which a standard induction pipe was used having the feed pipe flange directly underneath - see sketch No.3. Very good results were obtained and slightly more power at high speed was given than with the Hispano type manifold. We assume this to be due to the ports giving greater volumetric contd :- Blueprint Text: No 2. STREAM OF FUEL UP REAR OF PIPE. PHANTOM CARB. FITTED TO PREVIOUS PIPE | ||