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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).
Technical description of the lubrication system, carburation, and clutch components.

Identifier  ExFiles\Box 42\2\  Scan082
Date  18th September 1922 guessed
  
R

is also carried to the little ends of the connecting rods which are extremely light nickel steel forgings.

There are 3 oil leads to the crankshaft, and the remaining bearings and connecting rod big and little ends are lubricated by the oil passing through the passages in the crankshaft.

The valves are made from high chrome non-corrosive steel.

In order to prevent the crank chamber fumes from entering the body, provision is made that these shall be drawn into the induction system.

(D). CARBURATION SYSTEM.

The carburetter is a modified design of the standard RR. expanding carburetter, and has 2 jets controllable from the instrument board. There is also a third jet for starting purposes, also controlled from the instrument board, which gives a mixture of ample strength during starting operations. The induction system is well heated and the engine has been run successfully on a mixture of petrol and paraffin. The induction manifold is arranged to give equal distribution at low temperatures, or with poor fuel.

(E). CLUTCH.

The clutch is of the single dry-plate type fitted with ferodo and steel surfaces. It carries 4 levers revolving with it, so that the thrust is light, and with this and other features it's operation is remarkably smooth, shunting the car backwards and forwards with great precision.

Owing to the extreme lightness of the driving member and it's great freedom when declutched, the changing of gears is very easy, certain, and free from shocks.

The friction surfaces are extremely durable and it is nearly impossible to damage them by injudicious use.

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