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 on an air intake system with a sketch of two tuning chambers.
| Identifier | ExFiles\Box 13\4\ 04-page059 | |
| Date | 22th November 1932 guessed | |
| -2- lower speed roars, keeping the small chamber as the second tuning chamber. By this we mean that the larger of the tuning chambers should be the first one to deal with the air intake as per sketch. [Sketch of an air intake system] AIR INTAKE 6.5" 7.00" FIRST TUNING CHAMBER SECOND TUNING CHAMBER. To CARB. We rather expected this from the results obtained and the position of the chambers on silencer (C), and we proved later, on the road that the small chamber operating firstly and the larger one secondly, was not nearly so efficient as the other way about. We experimented with various sizes of chamber and obtained our best results with the dimensions given in sketch, and we claimed from this a 60% efficiency. We next turned out attention to length of air intake pipe and fitted one that would just go underneath the bonnet namely 15" long. This improved matters considerably, and so we next moved the large tuning chamber higher up the air intake tube just above the small tuning chamber, as per sketch. | ||