How to overhaul a Stromberg carburettor
Instead, it actuates carburetor mechanisms which meter the flow of air being carried into the engine. On the front carburettor, the W-clip similarly mounts under the throttle lever nut. This sets the correct throttle closed position.
Carter used the suffix letter S to denote assembly. The fuel stored in the chamber bowl can be a problem in hot climates. Start the vehicle and bring it to normal operating temperature and idle. This is one of the more common carburetors.
The better type set-ups use hexagonal throttle rods to avoid the clamps slipping. From the chart above, the inner hole delivers a lot less fuel, and finishes doing so at a lower throttle shaft rotation. In some cases, it may be necessary to extend the accelerator pedal lever by welding on a piece of flat bar in order to get enough pedal travel to attain full throttle. The purpose of the rod is to reduce the cross-sectional area of the idle channel to provide a good idle under extremely hot operating conditions.
Bendix-Stromberg produced a number of pressure carburetor styles and sizes, each of which could be calibrated to a specific engine and airframe. Note that the needle and seat assembly Bendix Australia part numbers and which is made by Fuelmiser is also made by Genuine Stromberg. Bendix used a special method to identify round carburetor bores. Why is my Stromberg carburettor running so poorly? Note that the original Stromberg gaskets were fibre, and that the Fuelmiser kit gaskets are alloy.
Dismantle and clean them about once a year. The tool smoothes the bore transition so that the piston leather does not crease or wrinkle. The photo below to the right shows a return spring mounted off a bracket on the original battery tray.
Paint thinners also does a fair job of removing the gunk. There are four chambers in the fuel regulator portion of the carburetor. The photographs above show the mounting of the clevis and cable guide on a number of vehicles. Too low a fuel pressure and the fuel level drops in the bowl.
Otherwise manually clear the obstruction, taking care not to enlarge the main metering jet hole or replace the jet. After adjusting the throttle linkage, reset the idle speed with the engine in Drive. Early carburetors were of the surface type, in which air is combined with fuel by passing over the surface of gasoline. The adjustable main metering jet is used in conjunction with a special main metering jet that is much larger than the engine will ever need. The Mitsubishi L accelerator cable is quite long, and can be shortened with a simple pair of sidecutters to the correct length once installed.
The gap between the washer face and seat is adjusted at idle to the settings tabulated below, taking care that the choke is off. There are different stoichiometric ratios for other types of fuel. When the throttle is rapidly opened, airflow through the carburetor increases immediately, faster than the fuel flow rate can increase.
How to overhaul a Stromberg carburettor
Next, it is also a given that within that range of acceptable mixtures, there is only one ratio that is the ideal air-fuel ratio at that time, given the throttle position set by the pilot. Reverse the above steps to reassemble the air horn. The difference in pressure between chambers A and B creates what is known as the air metering force'.
The stock inlet manifold can be made to breathe easier by splitting the manifold lengthwise across the flanges and grind out the centre of the manifold. Puff of black smoke from exhaust that quickly clears. Reset the pump stroke to the correct measure bench or in-vehicle. With the carburettor inverted, measure the height of the float above the body edge.
Removing the dashpot and piston
With the throttle plate pretty much closed, almost all the vacuum created by the pistons moving downward manifold vacuum is concentrated on the lower idle discharge hole under the throttle valve. Choke valve rubbing on air horn. Float needle and seating Fuel pump Fuel line fuel tank to pump Sticking closed.
The slower air speed also means that the fuel delivered is not atomized as well as a single carburettor. Note that the Stromberg Carburetor Ltd jets are at the small lean end of the scale, and are more likely to be useful to those running twin or triple carburettors than those running singles. Serious headwork, valve train, exhaust and the accompanying bottom end to stop it all grenading is required to run the big brother single Stromberg carburettor. The primaries in such a carburetor are quite small relative to conventional four-barrel practice, while the secondaries are quite large. Note also that the O or U letters will change the above throttle barrel diameters away from standard.
- Note the large gap between the gasket bore and the throttle body bore, and the misalignment of the flange bolt holes, highlighting the need to buy the additional correct gasket.
- Note that it is also possible to increase the vacuum setting at which the vacuum power piston will open.
- Worn, damaged or stuck in the up position.
- Constant vacuum carburetors, also called variable choke carburetors and constant velocity carburetors, are carburetors where the throttle cable was connected directly to the throttle cable plate.
- This blocks off a lot of the air holes, reducing the amount of air getting into the fuel mixture.
- The pressure of fuel from the fuel pump pushes against the diaphragm in chamber C, moving the servo valve toward the closed position.
Clear any obstructions in the fuel lines and check the fuel pump for correct delivery volume and pressure. Should any of these surfaces not be flat, schwuler mann flirtet mit professional milling or replacement may be required. The Video Course teaches you everything about modern cars. Some carburetors in this group are worth the absolute identification.
Bendix-Stromberg pressure carburetor
For vehicles which do not operate in a cold climate, the second and third choke plate may not be necessary, and the actuating lever can be wired into the open position. Replace the choke return spring. Main discharge jet Lack of maximum speed or power High speed bleeder Vacuum power piston Power bypass jet Fuel level. The idle adjustment screw is shown at A. They tend to be mainly solvent, evaporate very quickly, and are this not much use for soaking parts.
This is indicated by the red arrow in the image above. Adjust the float by bending the tag that touches tho needle valve, or by fitting a thicker or thinner washer under the valve. Replace the gaskets and washers and tighten unions.
See variable venturi carburetors above. Poorly referenced material on the topic should be viewed with suspicion. As fuel is used up, the float drops, opening the inlet valve and admitting fuel.
How a Car Works
Some enthusiasts believe that multiple carburettors offer an advantage where the fuel has less far to travel down the manifold compared to a single, larger or two-barrel carburettor. This connection needs to be replicated in multiple carburettor setups. The cable then passes across the engine bay to the carburettor throttle linkage. The diaphragm is connected to the needle valve and as it moves inward it opens the needle valve to admit more fuel, single thus replenishing the fuel as it is consumed.
- Zenith carburetor produced after about will not have the round tag, but will have a tiny number stamped never raised in a semi-circle on the body of the carburetor.
- The level shown in the gauge is the same as that present in the fuel bowl.
- Slacken the securing screws slightly and centralize the valve plate.
- In this case the special jet does not provide the restriction to do the metering the needle valve does.
Troubleshooting Stromberg Carburetors
Alternately to employing a power valve, the carburetor may utilize a metering rod or step-up rod system to enrich the fuel mixture under high-demand conditions. The Model number is sometimes, but not always cast into the throttle body. The valve is opened as the discharge fuel pressure increases above the force from the spring, dating guys you're not attracted thereby lowering the fuel pressure to maintain a balanced position with the spring force.
The color used was a code to help identify the carburetors. Damaged tip, crushed or enlarged side holes. At idle, the accelerator pump stem rises upwards, and opens the valve. The accelerator pump can also be tuned to give better throttle response. This provides the rich mixture required to sustain operation at low engine temperatures.