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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).
Cylinder head blueprint, focusing on valve layout, rockers, and gear adjustments.

Identifier  ExFiles\Box 17\6\  Scan022
Date  22th February 1928
  
R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer}
c. to BJ. Hs.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer}
47060
E4/M22.2.28.

EAC.10 CYL: HEAD. X.7050 X.7060

We send herewith blueprint of Lec.2509 shewing the instructions sent to Derby for the cyl. head.

The question of valve sizes will be discussed in a separate memo. but all the valve passages have been kept up to 1.9" bore.

In this layout the valve rockers are all straight and interchangeable - i.e. the push rods being on the same centres as the valves, but not equi-distant on each side of the cyl. centre, owing to the unequal sizes of the valves.

The valve gear is of the 20 HP. ty-pe, but with an adjustable ball end on the lever. It is a moot point whether one of the adjustments cannot be cancelled.

E.{Mr Elliott - Chief Engineer}
  
  


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