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).
Brief general specification of the E.A.C. 10 engine and its differences from the present Phantom.
| Identifier | WestWitteringFiles\R\October1927-December1927\ Scan156 | |
| Date | 28th December 1927 | |
| HS.{Lord Ernest Hives - Chair} FROM E.{Mr Elliott - Chief Engineer} ORIGINAL E1/M28.12.27. C. to BJ. R.{Sir Henry Royce} DA.{Bernard Day - Chassis Design} E.A.C. 10. X7770 X4663 C BRIEF GENERAL SPECIFICATION OF ENGINE. In response to your memo. HS{Lord Ernest Hives - Chair}2/LG211227., the following is a brief specification of EAC. 10. engine. The leading dimensions of the engine are in no way different from the present Phantom. The changes may be briefly summarised as follows:- (1) The engine is fitted with the aluminium turbulent head having overhead valves centrally situated, and sparking plugs arranged on opposite sides of the head. (2) The engine, clutch, and gearbox, are bolted together to form a unit, and the whole unit is mounted on a rubber suspension in the chassis frame. (3) The moving parts of the engine have all been made lighter and stiffer where possible, and a new type of crankshaft damper and timing gear spring drive is employed, which in conjunction with the stiffer crankshaft and lighter moving masses, puts up the master period of vibration to a much higher speed than on the present Phantom. (4) The induction and exhaust systems are now situated on opposite sides of the engine, the carburetter and inlet manifold being on the steering box side. This alteration has necessitated some re-arrangement of the units, and the water pump and throttle governor are now driven on the steering side, while the dynamo and magneto have been transferred to the exhaust side. The ignition tower remains unaltered in position, but now has the oil pump driven from its lower extremity, the latter unit having been moved to allow of strengthening of the crankchamber. The oil relief valves, oil filler and level indicator, are all placed close together on the steering side near the dash. (5) The starter motor is of the direct action moving armature type engaging a gear ring carried on the flywheel. It is situated under the rear foot on the exhaust side of the engine, and is operated by electrical relay on the R-R sequence system, the starter switch being a push button on the instrument board. GENERAL. This brief summary does not mention a number of detail changes incorporated in the design which should lead to considerable reduction in weight without sacrifice of reliability, more stiffness where desirable, greater simplicity, and attendant savings in cost of production. E.{Mr Elliott - Chief Engineer} (Stamp: RECEIVED P. DEPT. DEC 17 1927) | ||