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).
Analysis of engine induction systems and performance, comparing American and Bentley designs.

Identifier  ExFiles\Box 173\1\  img420
Date  6th February 1934 guessed
  
3

exhaust and inlet are taken out
on the same side and a simple
hot spot arranged, with a thermostat
controlled butterfly unbalanced which
by passes the heat when once warmed
up. By developing the materials the
Americans have made this work every
time, siamesed induction ports, four
branch pipe for 8 cyls.
This is not bad for M.E.P. because
on the Cadillac 16, with a short duration
camshaft having accelerations only 80%
of ours, a carb for each 4 cyls expanding
type, induction ports in no way more
streamlined than the Bentley and 6.5 C/R.{Sir Henry Royce}
they have the following M.E.P. curve
R.P.M. 400 800 1200 1600 2000 2400 3600
B.M.E.P. 106 116 120.5 121 122 121 97

For a Rolls Royce, as opposed to a Bentley,
I think this is pretty good, Steadman
should be able to show if a siamesed
port fundamentally loses any volumetric
efficiency.
The M.E.P. for Cadillacs new La{L. A. Archer} Salle
side valve eight is definately down.
  
  


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