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Stromberg 175 Cd 2 Manual Pdf
Stromberg 175 Cd 2 Manual Online
Stromberg 175 Cd 2 Manual Download

This Stromberg •• CD •• or constant depression instrument is different from previous carburetters we have manufactured of fixed choke tube design. It operates on the' constant vacuum' principle, the choke area and the jet orifice varying according to the degree of throttle opening and the speed of the engine which will alter according to the load. It is a simple, compact and dustproof instrument with concentric float chamber surrounding the jet orifice with its attendant advantages over the more orthodox out-rigged float chamber some distance away from the jet.

Three principal die-cast aluminium castings are used in the construction, the main body, suction chamber cover and the float chamber,
resulting in an extremely light-weight carburettor relative to bore size and air flow.

The CD carburettor is suitable for installation between horizontal and semi-downdraught, the features which permit this inclination are the concentric float chamber and a central jet orifice which gives a very steep flooding angle, ensuring good operation and stable idling in hilly terrain with no tendency to cut out on fast cornering. The carburettor has a cold start device interconnected with the throttle to provide for a specific degree of throttle opening to ensure a suitable fast-idle as necessary when the motor is cold.

PRINCIPLE OF OPERATION

The petrol inlet I, a parallel tube to accommodate a flexible fuel pipe is at the side of the main body. From here fuel passes into the float chamber via the needle seating S where the flow is controlled by the needle 8 and the twin floats on a common arm 7. As the petrol level rises the float lifts and, by means of the float arm and tag, closes the needle on its seating when the correct level has been attained. With the engine running, petrol is drawn from the float chamber, the float descends and more fuel is then admitted through the needle seating. In this manner, the correct level is automatically maintained the whole of the time the carburetter is in action. The fuel from the float chamber will rise in the jet orifice 19 via hole 21 in the jet assembly, the fuel in the jet orifice being maintained at the same level as that in the float chamber.

Starting from Cold Havij free trial.

Carburetter types 125 CD, 150 CD, 175 CD and 175 CD·1.

When the choke control on the instrument panel is pulled out It operates the lever 6 at the side of the carburetter; this rotates the starter bar 20 to lift the air valve 18 in which is fitted the metering needle 29 from the jet orifice 19 to increase the area of the annulus between needle and orifice. In this manner the enriched mixture necessary to ensure cold starting is provided. Simultaneously, the cam on the lever 6 will open the throttle beyond the normal idle position according to the setting of the fast-idle stop screw 4 to provide the fast-idle speed when the motor is cold. When the motor fires the increased depression will lift the air valve 18 to weaken the initial starting mixture and prevent the engine stalling through over richness. While the choke remains in action the car may be driven away but the control knob should be released or pushed in gradually as the engine attains normal working temperature.

It will be appreciated that movement of the choke lever 6 will decrease progressively the extent of enrichment and degree of throttle opening for fast-idle to the point where the screw 4 is out of contact with the cam on the choke lever and the throttle is permitted to return to the normal idle position as determined by the setting of the throttle stop screw 3.

Carburetter types 125 COS, 150 COS and 175 CD·2S.

When the choke control on the instrument panel is pulled out, it operates lever 6 at the side of the carburetter; this rotates a disc 30 in the starting device in which a series of holes of different diameters are drilled. In the full rich position the largest hole will be in communication with the starter circuit and provide the richest mixture.

Petrol is drawn from the float chamber via a vertical drilling adjacent to the central main feed channels, through the starting device and into the throttle body on the atmospheric side of the throttle plate. Simultaneously, the cam on the starter lever will open the throttle beyond the normal idle position, according to the setting of the fast-idle stop screw 4, to provide the fast-idle speed when the motor is cold.

As the dash-board control on the instrument panel is gradually released, smaller holes will provide the petrol feed from the float chamber, therebyprogressively weakening the mixture strength to the point where the control is pushed fully home and mixture strength will be governed by the setting of the orifice adjusting screw and the idle speed determined by the setting of the throttle stop screw. On certain twin carburetter installations, the starting device is fitted to one unit only, and connected to the other by means of a plastic tube, providing a suitable mixture via a duplicated set of holes drilled in the starter disc 30.

Note: The accelerator pedal should not be depressed when starting from cold on either type.

Idling

There is no separate idling circuit in the Stromberg . CD' carburettor, and the fuel is provided by the jet orifice 19, the amount being controlled by the setting of the orifice adjusting screw 13 and the speed of idle by adjustment to the throttle stop screw 3 which limits the closure of the throttle when the foot is off the accelerator pedal. Turning the orifice adjusting screw, when looking on this clockwise decreases the mixture strength; anti-clockwise will enrich.

Normal Running

With the opening of the butterfly throttle manifold depression is transferred (via a drilling 25 in the air valve) to the chamber 24 which is sealed from the main body by the diaphragm 16.

The pressure difference between chamber 24 and that existing in the bore 26 causes the air valve to lift, thus any increase in engine speed or load will enlarge the effective choke area since the air valve lift is proportional to the weight of air passing the throttle 27. By this means air velocity and pressure drop across the jet orifice remain approximately constant ensuring good fuel atomisation at all speeds.

As the air valve 18 rises it withdraws a tapered metering needle 29 held in the base of the air valve by a screw from the jet
orifice 19 so that fuel flow is increased relative to the greater air flow. The metering needle is a variable and is machined to very close limits to provide a mixture ratio for all speeds and loads in line with engine requirements as determined by exhaustive tests on bench and road by carburetter specialists working in collaboration with the engine manufacturers.

Acceleration

At any point in the throttle range a temporarily richer mixture is needed at the moment the throttle is suddenly opened. To provide this, a dash pot or hydraulic damper is arranged inside the hollow guide rod 17