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 single piece vs two-piece weir type induction pipes for EAC.10 and EAC.14 engines.
| Identifier | ExFiles\Box 66a\2\ scan0177 | |
| Date | 17th February 1928 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} CY. 48070 WEIR TYPE INDUCTION PIPES. We have made further tests with the two weir type induction pipes on an EAC.14 and obtained good results. We understand these pipes were intended as test models for the EAC.10, the weir being designed to compensate for the short distance between the carburetter and the manifold. This condition the design seems to have successfully fulfilled. Of the two manifolds tested i.e. the single piece one and the built up one - the single piece type gave the better results. Looking at the interior contours of these two pipes we find they differ considerably - see sketch - the one giving the good results conforming more to the successful induction system on the P.XI. The main difference we note is that the connecting pipe from the carburetter to the manifold maintains its circular section until level with the top of the distributing manifold, the section then steadily changes to the slot. contd :i [Left Diagram] SCH 965 SINGLE PIECE PIPE GOOD RESULTS. [Right Diagram] JOIN HERE -> SCH 980 TWO PIECE PIPE | ||