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).
Test bench experiments comparing induction pipes and port arrangements on a Marmon engine against an E.A.C. engine, detailing a subsequent engine failure.
| Identifier | WestWitteringFiles\J\March1923\ Scan16 | |
| Date | 15th March 1923 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} SECRET. ORIGINAL Hsl/LG15.3.23. MARMON ENGINE. X.1692 / X.9070 We have been running the Marmon engine on the test bench with the object of using this engine to carry out experiments in connection with induction pipes for the E.A.C. engine. Attached herewith is report and curves which show the performance obtained. The comparison of the arrangement of ports on the Marmon and E.A.C. is as follows :- MARMON. (EX) 6 (IN) 5+6 (EX) 4+5 (IN) 4 (IN) 3 (EX) 2+3 (IN) 1+2 (EX) 1 E.A.C. (IN) 6 (EX) 5+6 (IN) 4+5 (EX) 4 (EX) 3 (IN) 2+3 (EX) 1+2 (IN) 1 The distribution with the Marmon type induction pipe with its standard carburetter, was far from good when cold and was only moderately good when hot. It was interesting to note that cylinders 1 and 6 were strong although there is a common inlet port for 1 & 2 and 6 & 5. We have made up a pipe similar to that proposed for the E.A.C., but unfortunately, before we could try this pipe, the Marmon engine broke down. The failure was caused by the aluminium bearing cap for the centre bearing of the Crankshaft breaking (there are only three bearings). The bolts also broke and parts of the broken cap were pushed through the bottom half. contd:- | ||