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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).
Piston knocks on pre-war chassis, specifically about using pre-war cast-iron pistons.

Identifier  ExFiles\Box 16\1\  Scan162
Date  4th September 1923
  
COPY.

Hm{Capt. W. Hallam - Head Repairs}/NRC.{N. R. Chandler}
C. BY.{R.W. Bailey - Chief Engineer}
C. Hs.{Lord Ernest Hives - Chair}

EP{G. Eric Platford - Chief Quality Engineer}8/H4.9.23.

Re Piston Knocks - Pre-War Chassis.

With reference to your Hm{Capt. W. Hallam - Head Repairs}/NRC{N. R. Chandler}1/D4.9.23, I cannot see any harm in using the pre-war type cast-iron pistons with the present type piston rings, so long as the pre-war clearances are given to the pistons and the post-war clearances given to the piston rings.

At the same time, I feel that the question of whether these should be used when not standardised, is a point which BY.{R.W. Bailey - Chief Engineer} and Hs.{Lord Ernest Hives - Chair} should decide.

Surely it is not a fact that all pre-war cars suffer from the same trouble.

EP.{G. Eric Platford - Chief Quality Engineer}
  
  


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