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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).
Modifications to Phantom piston rings to increase cylinder wall pressure.

Identifier  ExFiles\Box 16\1\  Scan205
Date  23th July 1928
  
X741
ORIGINAL
R2/M23.7.28.
HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce}
C. to BJ. HS.{Lord Ernest Hives - Chair}
PHANTOM PISTON RINGS. X741 X7040
We want to get more pressure on the cylinder walls by deeper rings, with wider gap.
Get some to give an increase of 50% by being .025 deeper and 10% more gap. The maximum stress of the ring will be greater.
I suggest say about .160 deep, and running deflection at gap of .6.
I think there is much in wall pressure per unit area.
R.{Sir Henry Royce}
  
  


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