Rolls-Royce Archives
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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 6-cylinder engine's design, components, and performance characteristics.

Identifier  ExFiles\Box 42\2\  Scan081
Date  18th September 1922 guessed
  
(C) ENGINE.

The 6 cyl. engine has it's crankshaft carried in 7 bearings and runs from 150 to 3000 revs. without apparent vibration, and owing to the perfect working of the RR. expand-ing carburetter and carburation system, it pulls with great torque throughout it's useful range of speed. The journals and the pins of the crankshaft are bored hollow for lightness and strength and the crank forgings are machined all over.

The cylinder arrangement although appearing somewhat usual, is quite unique, as the pushrods for the overhead valves are on the opposite side to the ignition plugs, which latter are in an extremely good and accessible position, i.e. they are well in the crown of the combustion chamber, well out of the way of oil, and very accessible. The valve gear is particu-larly silent and remains so; this is due to the great care tak-en in the design and proportions of the valve operating mechan-ism.

The cylinders are a monobloc casting and also the head, which is detachable; all the valve seats are water cooled, the joint between the head and the cylinders is most carefully propor-tioned and has never given a moments trouble. (Vastly more reli-able than the usual loose heads on a side valve engine.)

The half time wheels driving the camshaft and other units are helically cut, and the RR. damped spring drive (patented) is used giving a smooth and silent drive through the full range of speed.

The pistons are of aluminium and owing to their design and
they are light, free from knocks,/not liable to seize.

Owing to the careful arrangement of piston rings the wearing surface can be well lubricated without fear of excess of oil entering the combustion chamber. The pressure lubrication

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