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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).
Design considerations for a Straight '8' Engine, including big-end area and construction.

Identifier  ExFiles\Box 133\2\  scan0177
Date  23th September 1935
  
X 1129

To E.{Mr Elliott - Chief Engineer}
c. to E/Tsn.

HS{Lord Ernest Hives - Chair}/Smth.8/KW.23.9.35.

Straight '8' Engine.

We have been looking into the question of big end area for this engine.

We anticipate that the power will peak at about 5,000 r.p.m. and that the maximum useful speed will be 5750 r.p.m.

Allowing for a maximum M.E.P. of 15% more than our present supercharged Bentley (i.e. 160 lbs/sq.in.), we consider that we need a big end area of 2.65 sq.in. for a 3/4 x 4 engine, which is very nearly the same as that quoted in Tsn's list of particulars.

If we adopt an aluminium construction with water between the cylinders, we ought to have no difficulty in designing a connecting rod which will pass through the bores.

HS{Lord Ernest Hives - Chair}/Smth.
  
  


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