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).
Outlining three design schemes for the revision of the 25HP 'Japan' engine.
| Identifier | ExFiles\Box 6\7\ 07-page102 | |
| Date | 11th November 1930 | |
| BY.{R.W. Bailey - Chief Engineer} FROM E.{Mr Elliott - Chief Engineer} A9230 E1/M3.11.30. C. to BG. WOR.{Arthur Wormald - General Works Manager} C. to HS.{Lord Ernest Hives - Chair} HY.{Tom Haldenby - Plant Engineer} REVISION OF 25HP. ENGINE 'JAPAN'. X.5770. X.5050. X.5330. We send you herewith three schemes as follows dealing with the above:- Lec. 2833. CYLINDER HEAD. This is on the lines of the present 'Japan' with 6 inlet ports on the steering side of chassis, but is of cast iron, and arranged to take two ignition plugs per cyl. if and when required. The core boxes should be made so that the boss for the extra sparking plug can be put in at will as it is not intended to standardise twin plugs. When the sparking plug boss is left out then the cylinder stud bosses have to be ribbed to the cylinder head instead of to the plugged boss as shewn in the drawing, and vice-versa. This cylinder head will not fit any existing engine, but a suitable cylinder and crankcase is shewn on Lec. 2838. attached. Lec. 2835. EXHAUST MANIFOLD. This manifold is on the lines of P. 2. and is arranged to admit of the use of the extra set of plugs should these latter be required. Lec. 2838. GENERAL TRACING SHEWING SECTION THROUGH CYL. BLOCK & CRANKCASE GIVING PARTICULARS OF CON. ROD, PISTON, VALVE GEAR ETC. The con. rod has been increased in length to render the engine smoother in operation on the over-run, and at the same time it has been made with a parallel stem machined only within the panels of the 'I' section to facilitate production. The valve tappet gear is on the lines of P. 2. but the lubrication has been improved by completely enclosing the camshaft within a tube formed integrally with the crankcase, which tube will be flooded with oil. Tappet guides are located by a scheme which should be satisfactory for interchangeable production, and these guides in turn position the camshaft bearings endways. Further schemes will follow giving remaining particulars of the crankcase, wheelcase, and gears, etc. E.{Mr Elliott - Chief Engineer} | ||