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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).
Description of a pair of cylinders with inlet pistons, detailing their operation and construction.

Identifier  ExFiles\Box 148\2\  scan0095
Date  28th November 1938
  
-2-

The two figures represent a pair of cylinders with the inlet piston

A, at top centre and
B, at bottom centre.

The two pistons, inlet and exhaust will not both reach their top and bottom centres simultaneously because of a 15° phase angle on the crank pins. I represents the inlet ports, drilled circumferentially round the inlet cylinder; E represents the exhaust ports, drilled in the exhaust cylinder of similar design but slightly larger. Both these sets of ports are uncovered when the pistons approach bottom centre, at which time the fresh charge is supplied under pressure through I, filling the combustion space C, and driving out the exploded mixture through E.{Mr Elliott - Chief Engineer}

The pistons are of aluminium alloy, of orthodox construction, flat topped, and the rings are similar in design to the latest 'Phormicast' rings made by Hepolite in this Country. 2 Compression rings and one oil retaining ring are used per piston.
  
  


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