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).
Summary of observations on cam ground, aluminium, and trans-slot pistons.

Identifier  ExFiles\Box 170\2\  img215
Date  9th November 1934 guessed
  
3
All pistons are cam ground and are a very pretty job.
We dream of the day when we can produce a circular ground piston which will bed itself. Making an accurate job of the cams is very difficult & involves hand stoning.
Ellio has a special indicator rig for gauging cams accurate to 1/100 of a thousand.

"En somme :-

Aluminium pistons have been a success.
Trans. slot pistons about 1 1/2 thou slack cold and 7 thou. slack on the sides promise to be even better.
Low oil consumption at low speeds is a trouble.
Cold starting has not been a trouble.
Cold knocks & hot idle knocks have not been a trouble.
Power is greater with the trans. slot piston.
En bloc cylinders introduce new troubles not yet thoroughly understood.
  
  


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