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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).
Defective starting devices and proposed improvements to carburetters.

Identifier  ExFiles\Box 31\3\  Scan058
Date  10th October 1921
  
To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} C. to CJ.

X1449

R3/G10.10.21.

X.2763 - RE CARBURETTERS AND STARTING DEVICES. X.4390
X.4387 X.1449

We conclude from your memos that all starting devices are very defective. We have endeavoured to improve on such as the Zenith, which may be considered a standard one, and also to improve on the system of a simple choking device, such as is used by the Americans and by Claudel-Hobson.

Now it seems quite evident that we require a starting device which will continue to run the engine both cold and hot with the necessary mixture, both in strength and quantity, for the very wide conditions that one meets with.

This apparatus now appears to be equally exacting to the main carburetter, inasmuch as it should give an increasing strength the lower the suction, rather than the reverse, which is natural to simple carburetters.

This cannot be accomplished without a device which has a mechanical movement, which is confirmed by the experiences with the main carburetters.

We are therefore sending within the next few days a modification to the small jet at the side of the float feed chamber having the features similar to that sent by you of a moving throat, but we are endeavouring to avoid the use of the spring, and also arranging the apparatus so that it automatically reduces itself to almost a choked carburetter. We are not sure whether it will be found necessary to let this apparatus be always connected so as to give extra good slow running, but for the sake of simplicity and urgency, it may be considered as a starting jet

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