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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).
The features and performance benefits of the G.U.C. carburettor.

Identifier  ExFiles\Box 122\4\  scan0108
Date  17th April 1936 guessed
  
4
WHY THE G.{Mr Griffiths - Chief Accountant / Mr Gnapp} U. C. CAN GUARANTEE SUCH EXCEPTIONAL RESULTS

When reading the following description open out the large sectioned drawing on back page, when text and drawing can be followed with ease.

UPDRAUGHT. The Updraught feature has been deliberately chosen as being a theoretically perfect design. It creates a stream of air through the carburettor in the same direct line as the flow of the mixture feed. It therefore possesses all the advantages of the Downdraught principle without the attendant disadvantages of heavy consumption when accelerating and grave risk of fire and dilution of crankcase oil if the carburettor should flood.

AUTOMATICALLY VARIABLE CHOKE TUBE. The diameter of the choke tube regulates the amount of air passing through the carburettor. The choke tube should be small for rapid acceleration, and should be capable of expanding to its largest dimension for full speed, with an infinite variety of gradations between these extremes.

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[GRAPH]
Graph Y-axis (left): PTS PER H.P., values 0 to 1.0
Graph Y-axis (right): H.P. values from 5 H.P. to 35 H.P.
Graph X-axis: M.P.H., values 20, 30, 40, 50, 60

Line 1: PTS. PER H.P. WITH STANDARD CARBURETTER. Data points: .875, .863, .942, 1.016, 1.090
Line 2: PTS. PER H.P. WITH G.U.C. Data points: .66, .60, .592, .63, .70
Line 3: 14 H.P., 22 H.P., 26 H.P., 27 H.P., 31 H.P., 32.5 H.P.
Label 1: 33.5 H.P. WITH STANDARD CARBURETTER
Label 2: 35 H.P. WITH G.U.C.

THE RESULTS ACHIEVED.

Superior to all other carburettors on all the following points :—

20 PER CENT. PETROL SAVING.
INCREASED HORSE POWER.
LESS ENGINE WEAR.
NOTHING TO WEAR OUT.

Easier Starting . . . More Economical . . . Quicker Acceleration . . . Unequalled Flexibility . . . Higher Speeds . . . Less Engine Vibration . . . Exceptional Top-Gear Performance . . . Better Hill-Climbing . . . Less Carbon Deposit . . . Simplified Accessibility . . . Automatic in Action and no Extra Working Parts.
  
  


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