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).
Report page detailing experiments comparing Hispano-type manifolds with other designs, including a blueprint of an Eagle carburettor on a modified manifold.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan099 | |
| Date | 1st August 1926 guessed | |
| contd :- -3- at high speed was given than with the Hispano type manifold. We assume this to be due to the rounded bends leading to the ports giving greater volumetric efficiency than the square bends of the other type. With this pipe we were able to make direct comparison by swinging round the adjustable flange and fitting a standard hot spot bend and carburetter. In the standard position the distribution was bad and power consequently low. During these experiments it was found better to employ a short length of feed pipe (about 6") between the carburetter and distributing pipe than bolt the carburetter direct to the distributing pipe. A system employing two Eagle carburetters and practically identical to the Hispano system was tested. See sketch No.4. This also proved to be very good and gave slightly more power than either of the other systems. This is probably the result of avoiding over-lapping of suction strokes and the lower depression due to two carburetters being used. contd :- [Blueprint Text] ADJUSTABLE FLANGE EAGLE CARB ON MODIFIED STD MANIFOLD No 3. | ||