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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 for an exhaust system for a 25 HP model, utilizing a 40/50 HP type silencer.

Identifier  ExFiles\Box 6\7\  07-page121
Date  11th May 1931
  
To By.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}

X5230.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}8/KT.11.5.31.

EXHAUST SYSTEM FOR 25 HP.

X.5230.

Confirming our conversation of Saturday, we should like you to instruct a 40/50 HP. type silencer for the 25 HP. taking advantage of the fact that the alteration in the position of the fish tail will enable the expansion box to be lengthened. Also, that we can increase the diameter of the expansion box 2" without reducing the ground clearance. The features to go with this silencer are a 2¼" O.D. pipe straight through from the manifold to the expansion box, the fish tail diameter 1¾" and the fish having an outlet of not less than 2.25 sq.in.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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