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).
With sketches comparing T-slot and Trans-Slot piston designs, materials, and performance.

Identifier  ExFiles\Box 170\2\  img213
Date  9th November 1934
  
E.C to W.O. By Wd.{Mr Wood/Mr Whitehead}
holes on Pistons.
Just gathered from Byron Ellis.
At present we are using pistons with T slots thus :-
These are in Lynite possibly similar to Y alloy.
The difference in practice between this and Low-Ex. is not marked.
They are all "anodyzed", but the actual effect of anodyzing on wear is doubtful. Probably helps during the break-in period.
"Trans-Slot" pistons thus :-
with inside pillars thus :-
Are proving more successful than the T slots & have as little hot friction
  
  


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