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).
Tests of different intake systems for cold distribution performance.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 34 | |
| Date | 2nd February 1927 guessed | |
| contd :- -2- present standard pipe at low induction pipe velocities. In some cases we have had what at first sight looked like promising results from certain pipes but the results have not been consistent and we have not been able to reproduce them from time to time on different engines. This was the case of the slotted intake pipe which on the test bench gave good results but which could not be appreciated from the standard pipe when installed on a car. The following gives a brief description of some of the systems we have tried for cold distribution :- (1) Slotted intake pipe. On the test bed the results with this shewed a slight improvement over the standard particularly at the low speeds. The high speed results were practically the same with each. The two pipes were compared on a 'Light Phantom' car both using water heating and the difference we experienced on the test bench was not appreciable on the car. The water heating shewed up to be definitely worse than the exhaust heating for a quick get-away with cold engine. (2) Carburetter with two throttles. This was arranged as instructed and fitted in the centre of a straight pipe feeding the ports. (See sketch - fig. 2) The distribution was considerably affected by the position of the throttles being fairly good when the throttles were about half open. The high speed distribution and power was bad - the power being about 15% lower than given by the std. pipe at 2000 r.p.m. contd :- | ||