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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).
Development programme for a single-cylinder high-power head, based on a 10% power improvement over a Bentley head.

Identifier  ExFiles\Box 133\1\  scan0092
Date  4th August 1936
  
To RHC.{R. H. Coverley - Production Engineer}
X1179
HS{Lord Ernest Hives - Chair}/ED.{J. L. Edwards}16/JH.4.8.36.

High Power Head.

We find that on comparing the above head with the best we have so far obtained on the Bentley, that there is a power improvement of approximately 10%, and we feel therefore, that this head is worth developing.

As a result the following programme for the single cylinder unit has been evolved -

Heads.
(1) Modification of existing single inlet valve head as under :-
(a) Change material to aluminium.
(b) Incorporate a variable lift mechanism a scheme being suggested in SCT.41

(2) Make a second head with a 1.650" dia. inlet valve, allowing sufficient metal to enlarge the parts and the valve to 1.950" dia. as per SCT.37.

(3) Make a third head with standard valves and an inclined combustion chamber plug to bring the plug points in line with the combustion chamber walls (SCT.40).

Blocks.
(4) Two new cylinder blocks are required to replace the existing one, which has been scrapped, one being a spare.
  
  


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