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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).
Breakdown and description of the components for a Stromberg DA-42 and DB-42 carburetter.

Identifier  ExFiles\Box 122\2\  scan0080
Date  15th October 1936
  
X1033
15th October, 1936.

Stromberg Carburetter.

Type DA{Bernard Day - Chassis Design}-42 and DB{Donald Bastow - Suspensions}-42.

(a) Main metering jet - Controls part throttle fuel supply, and supplies idle system.

(b) By-Pass Jet - Augments the metering jet (a) supply to full throttle strength at full throttle, required over the whole full throttle range.

(c) Main Discharge Jet - Fuel delivery and emulsion tube, both (a) and (b) feed through here.

Idle bleed hole in base of (e) controls supply of fuel to idling jet, and fuel from bye-pass goes through here to (c). This hole has definite effect re "luffing". Bore of (c) controls "top end" and therefore allows for adjustment on by-pass at low speeds (full throttle).

(d) Air Bleed - Controls air supply to emulsion holes.

(e) Idle Tube - (Low speed jet in effect) - Supplies throttle edge. Air controlled by external screw.

(f) Throttle Edge. (Discharge holes). When throttle is closed, top hole atmosphere, and acts as extra air bleed to throttle edge supply. Bottom hole (idle feed) - tick over supply.

(g) Pump Jet - Controls supply from accelerator pump.
  
  


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