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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 starting difficulties and a proposed solution involving an additional small carburettor.

Identifier  ExFiles\Box 149a\3\  scan0056
Date  8th June 1921
  
Contd. -3- R10/G8.6.21.

This seems comparatively easy and practicable but we do not
know just yet whether this is sufficient or all we can do.
Regarding the starting, this seems to be entirely
a question of getting evenly distributed throughout the
cylinders continuously a sufficiently rich mixture of fuel
and air. It does not require the engine turning at a high
speed, and we believe the trouble can be completely met by the
use of the extremely small additional carburetter, and the
small bore pipe or pipes leading to the induction manifold.
Ie do not believe in a choker, as it is apt to get the engine
(in careless and clumsy hands) flooded with liquid gasoline,
amongst other things sooting up the plugs, and thus causing
irregular firing, and also I do not think it advisable
to attempt to run the engine at a higher speed by the starter
motor because although the starter motor is sufficiently
powerful and could be wound for a higher speed, or even by gear
ed{J. L. Edwards} for a higher speed, it would make such a large drain upon
the batteries that the trouble with the batteries would
increase. Moreover, I do not think it is at all necessary,
and considering that we have a battery ignition, and intend
to fit a means of continuously getting gasoline into the
induction manifold, with the extremely small carburettor
mentioned above, the trouble of the difficulty of the engine
should cease.
Such an arrangement can be applied to existing
cars and Mr. Platford has a model which can be used to
Contd.
  
  


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