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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).
Engine power figures related to exhaust and induction system modifications for a Paulin Bentley.

Identifier  ExFiles\Box 122\4\  scan0216
Date  13th January 1939
  
1036 also 1379

To Rm.{William Robotham - Chief Engineer}

Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} - 13.1.39.

PAULIN BENTLEY.

In connection with the above, we attach the power figures obtained on our test bed unit when fitted with the special parts that Ratcliffe has taken to France with him.

Referring to Graph S.71 attached, Curve (2) shows the power lost to the standard exhaust system.

Curve (4) shows the power that is regained if all parts of the exhaust system are removed immediately after the "cut out".

It is evident, therefore, that little would be gained by attempting to increase the efficiency of the cut-out, when fitted in this position.

It may be necessary for Ratcliffe to retain the standard Induction System for the following reason. It is very essential that "dampers" are used in the pistons of the 1¾" Induction System, and these may not be available in time.

Curve No.(5) shows that 5-8 B.H.P. is lost in this event.

Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}
  
  


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