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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).
Experiments and modifications for carburation systems and clutch float chamber design.

Identifier  Morton\M11\  img106
Date  18th December 1918
  
To BY.DA.{Bernard Day - Chassis Design}& EH. from R.{Sir Henry Royce} -7- R7/G181218 Contd.

(10) CARBURATION.

Experiments should be made to overcome distribution troubles at present being experienced with the use of the heavy fuel now being supplied to the public. The extra induction pipe jacket and smaller radiator area obtained by blocking off part of the matrix, should be tested.

The Northcliffe chassis fitted with the "Hawk" engine should be fitted with an alternative induction pipe and carburettor system. The carburettors should be two Claudel-Hobson 26 m/m diameter choke, arranged as shewn in sketch, so as to deliver mixture symmetrically to the induction system. Each carburettor should have its own accelerator pedal, i.e. additional accelerator pedal for left foot when removed from clutch, so that the carburettors can be opened in series.

The parts required for this alternative system are intended to be supplied with the car when it is sent to Mr. Royce, so that the 70 H.P. R.R. carburettor can be removed at West WitteringHenry Royce's home town, and the Claudel-Hobson installation fitted in its place.

(Carburation contd.)

[Drawing of an intake manifold]

FLOATS FORWARD OF JET FOR HILL CLIMBING

ALSO WITH SYMMETRICAL AIR INLETS

(11) CLUTCH.

The float chamber needle seating on the 40-50 H.P. chassis should be made similar to the R.R.C.H. pattern. The elbow carrying the petrol feed connection from the tank should be incorporated in the float chamber casting itself. A design on these lines should be submitted to Mr. Royce.

(Contd.)
  
  


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