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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).
Performance and power loss of different vehicle silencers.

Identifier  ExFiles\Box 66\2\  scan0088
Date  5th September 1925 guessed
  
contd :- -3-

on either of these silencers. The addition of this gives no
extra silence and tends to keep the exhaust gases hot at points
where it is necessary to cool them down as much as possible. It
is necessary however to keep the lagging on the exhaust pipes as
far as the expansion box.

POWER.
We attach curves showing the losses in the various
silencers. At 2000 revs (60 m.p.h.) the loss to the silencer
is :-
Silver Ghost 15.6%
Present std. EAC. 11.5%
'B' type silencer 14.9%

At speeds above 60 m.p.h. one assumes that the cutout would
be used.

Hs{Lord Ernest Hives - Chair}/AJL.
  
  


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