Rolls-Royce Archives
         « Prev  Box Series  Next »        

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 improvements for cold weather and poor fuel, focusing on the exhaust heated throttle and induction system modifications.

Identifier  Morton\M7\  img045
Date  1st December 1924 guessed
  
(2)

are applying to the 40/50, this and many other smaller improve-
ments have been introduced.
(3) The third point that comes to my mind is that I think we
in England and they in America are not doing enough to cater for
the poor petrol and cold weather. We want to apply at once
the exhaust heated throttle which has been proved out to be the
place and the only place where heat is really effective, without
disadvantage. This exhaust heated throttle applies therefore
more heat in exactly the right spot. In England we do not think
the vaporiser scheme is worth the trouble and complication it in-
volves, because it is only useful for starting. Naturally the
hand controlled louvres with the more reliable thermometer has
done much to help, but really this to my mind is all that has
been done, together with avoiding certain curious imperfections
in the inner surface of the induction pipe. We may add here
that we have tried endless modifications to the induction pipes,
and the position of the carburetter, but we have found nothing
superior to our original standard pipe and position of carburet-
ter, provided we maintain the temperature of the water, and get
as much heat as we can at the throttle valve.
You will remember that in our arrangement we maintain the
heat at the throttle by closing a butterfly valve in one of the
down exhaust pipes. To avoid any risk of the throttle valve
being held open by the sticking of this second valve, we have late-
ly arranged for this to be closed by a separate spring on a free
lever so that it cannot be the cause of sticking open the main
throttle valve. We think this is a patentable feature as it is
manifestly valuable for safety.

R.{Sir Henry Royce}
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙