Proposed modifications for the 'Japan 1' type 20/25 HP chassis.
| Identifier | ExFiles\Box 5a\1\ 01-page123 | |
| Date | 18th March 1934 guessed | |
| JAPAN(Experimental Engine) 1 TYPE MODIFICATIONS TO 20/25 HP. CHASSIS. REAR AXLE. Starting with the rear axle the question arises as to whether it should be 'hypoid' or 'present standard'. By introducing the Hypoid axle we could lower the floorboards 3/4" whilst maintaining the same condition in this type of axle that would exist in the present standard with present height of floorboard. In considering this, we must remember that the rear seat height cannot be altered owing to the fact that the top of the frame relative to the rear axle tube is fixed, and the bottom of the seat is fixed by the diameter of the rear axle box which is unaltered. The small amount of gain does not in our opinion justify changing to the hypoid type axle. PROPELLER SHAFT. We propose to increase this to 3" diameter, owing to the fact with the higher speeds attainable whiriing will take place with the 2 3/4" shaft as demonstrated by test. This alteration to the shaft demands a pot in the floorboards as the cross member would pass through the boards - the height of the pot is 3/4" with the present height of floorboards and present axle, and the same pot would be required if we were to reduce the floorboards height by 3/4" and use the Hypoid. GEARBOX. Use present standard type. CLUTCH. We propose to use the automatic lubrication from the gearbox to the clutch spigot. This was on 18.G.4 in France. We should use the present standard clutch except we would thicken the flange on the flywheel bolting to the crankshaft flange and also thicken the crankshaft flange itself. Both of these features have been demonstrated to be an improvement by reducing vibrations. ENGINE. (1) We propose to use the Japan(Experimental Engine) type of engine with the improved turbulent head made in cast iron to the increased bores at present standard. (2) The cylinder block would be modified to suit the Japan(Experimental Engine) head in question. This would make it somewhat deeper. | ||
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).