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).
Analysis of different exhaust manifold designs regarding power loss and gas flow dynamics.
| Identifier | ExFiles\Box 6\7\ 07-page025 | |
| Date | 17th January 1928 guessed | |
| contd :- -2- The reason the std. manifold gives such a considerable power loss - in this case 10 HP. at 3200 r.p.m. or 13½% - we consider is due to the opposing direction of the gas flow from each of the two end cylinders. With the above mentioned experimental manifold, where each pipe from the exhaust ports leads into the down pipe in the general direction of the gas flow, the interference or opposition of flow is avoided. The experimental system which comes next in order of power output is Sch. 936 - shown here in outline. From the curves it will be seen that although the power given by this manifold is only slightly less than the previous one at the high speed it falls away at the lower speeds. A sketch of the third manifold Sch. 923 is shown below. From consideration of these tests and previous experiments we should recommend a manifold designed on the lines contd. [Handwritten text on diagrams] Sch. 935 1/2 INSIDE DIAM. OPPOSING GAS FLOW Sch 936 SCH. 135 | ||