Stromberg carbs troubleshooting. Stromberg WW 2 Barrel Carburetor Technical 2019-01-25

Stromberg carbs troubleshooting Rating: 8,3/10 829 reviews

Chicagoland MG Club:Tech Tips

stromberg carbs troubleshooting

To do this you would have to set up an electric fuel pump use a pressure regulator to keep within specified pressure range to supply gas to the carburetor. The new vacuum base we are making is not compatible with the Load-O-Matic, which requires a special bowl casting too. Keep the jet central while you adjust the mixture by taking the damper rod out of the top of the carburettor and pushing a pencil or soft metal rod firmly down the hole to hold the jet in place. The discharge valve is spring-loaded to a preset pressure discharge pressure, acting as a variable size restriction to hold a constant pressure in chamber D, despite varying fuel flow rates. Tuning is a very difficult thing.

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Stromberg Carb Problem

stromberg carbs troubleshooting

If you do all of this and the engine still runs badly, your problem is probably elsewhere! If it rises and stays fast the mixture is too rich. Use both carbs on a quality direct linkage check our website at and set them both exactly the same so each cylinder gets the same charge. Or with the outers as primaries and a centre secondary. At lower revs, the intake velocity will slow and you could get gas puddling in the bottom of the intake. A thicker milk shake demands a fatter straw! We used an S in a circle as a Stromberg casting mark purely as a random decision. And you might well be leaning it out, too. On these carbs, lowering the needle leans the mixture, raising it richens the mixture.

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Carburetor Cures: Fixing Vintage Stromberg 97s

stromberg carbs troubleshooting

The first inch of bore diameter is used as the base number one, then each quarter of an inch increase in diameter adds one to the base number. Remove this, and the jet adjustment mechanism is exposed. Stainless steel needles used a sharp edge seat to make the lapping procedure effective. This pressure should not be less than 1½ lbs nor more than 3½ lbs at any speed. The notch on the bi-metal spring should be in line with the mark on the aluminum housing. These intakes were designed for racing so the mixture will take the nearest path. The fuel mixture is automatically altitude-controlled by the automatic mixture control.

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Stromberg 2 barrel carbs

stromberg carbs troubleshooting

The venturi creates a low pressure that changes with the velocity of the air. Lastly, the exact amount of fuel needed changes between the overly-lean lower limit of 16:1 and the overly-rich upper limit of 9:1 as the engine operating condition changes. Are all gaskets and O-rings sealing properly? An portion is either remotely mounted or mounted on the carburetor body. To test for fuel pressure, attach a pressure gauge to the output side of the fuel pump. Then ask if they have a wire running direct from the starter solenoid to the coil. The most famous of these today is the so-called Stromberg '97' which was used on Ford flathead V-8's either as original equipment or as a replacement carb from 1935-1949.

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6 Things You May Not Know About Stromberg 97 Carbs

stromberg carbs troubleshooting

For this carburettor, turn the Allen key clockwise to lift the needle and thereby enrich the mixture and anticlockwise to lower the needle for a weaker mixture. You need JavaScript enabled to view it. A need for oil more than once per fill-up would certainly be aggravating. And also depending on whether the primary pulls the front carb or pulls the rear one. The intake puts one carb directly over each port yet still provides a plenum space so they can all share mixture. The Stromberg worked fine when used in a conventional gear plane like an Ercoupe which it was designed for.

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Moss Motors Help Center

stromberg carbs troubleshooting

While the diaphragm is being inspected, pay attention to the following. They are referred to by letters A, B, C, and D, with the A chamber closest to the throttle body. Why did the fuel drip with the early stainless needle??? This may result in the air dropping below freezing, causing water vapor contained in the air to first change state from a gas to a liquid, which then becomes ice. Balancing the airflow on multiple carbs is not difficult if a Unisyn Moss 386-200 is used. And there is a conversion factor between them — ie. Some of these elements were made of oil filter paper that was much too dense to allow sufficient airflow at higher rpm—typically these elements could be identified by the tan color of the paper. Fuel level wildly wrong, excess pressure, bad inlet valve.

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6 Things You May Not Know About Stromberg 97 Carbs

stromberg carbs troubleshooting

. The fuel also flows to the mixture control valve, which is closed when in the idle-cutoff position and open in all other positions. I have had the set up for over 50 years now and used them on my first hot rod build when I was in high school. No gas coming out the accelerator pump hole on the air horn. Removing the jet Loosen the jet holder by turning the lower hexagon Do not remove the jet of an emission-control model See : a special adjusting tool is needed for its castellated adjuster nut. The four ends are blocked off.

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SU Carbs — Your S.U. and Stromberg carburetor authority

stromberg carbs troubleshooting

The overrun valve is floating open at a very low manifold depression. The is the main portion of the carburetor. Above or below this ratio, the fuel will not burn. That means more power for the rear wheels. To remove the diaphragm carefully undo the screws of its retaining ring. Sounds like a good strong engine. In the event of a combat or emergency situation, the mixture control may be moved to the auto rich position, providing extra fuel to the engine, or in military aircraft, into military position, if the aircraft is so equipped.

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