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).
Engine induction and exhaust heating systems, with a diagram of twin exhaust ports.
Identifier | ExFiles\Box 13\3\ 03-page072 | |
Date | 21th January 1929 guessed | |
-5- Contd. are subject to less variation in temp. from cold to normal working conditions which results in less variation in the mixture strength. The six port induction system with the overhead slot pipe gives better cold distribution than the Phantom system therefore we consider water heating, providing this is somewhere about 70°C, should be quite sufficient to take care of good distribution. For quickness of warming the hot spot we know of nothing better than the present std. Phantom system but with the aremax induction system on the opposite side to the exhaust we are handicapped in employing this scheme. We have tested exhaust heating with the exhaust gas taken from the passage at the centre of the cyl. block, which leads from the centre exhaust port, but find this quite inadequate to give even sufficient normal hot spot temp. even when the outlet from the hot spot exhausts direct into the atmosphere. Actually there is very little exhaust flow through this passage even when exposed to the atmosphere on one side and subject to the silencer back pressure on the other, due we think to the velocity and directional effects of the exhaust gas from the ports tending normally, providing there was no back pressure, to produce a suction in this passage. Exh PASSAGE THRU CYL BLOCK Contd. TWIN PORTS | ||