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Rebuilt Carburetors |
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360 347-1077 |
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One Carburetor at a Time |
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Holley 885-FF Carburetor |
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Holley 885-FF Carburetor |
Holley 885-FFG Carburetor |
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Holley 885-FFC Std Trans Carburetor |
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Holley 885-FFC Auto Trans Carburetor |
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Holley Carburetor Model 885-FF is a dual concentric downdraft carburetor with a side air inlet, designed for engines of approximately 230 to 500 cubic inch displacement. The side air inlet feature eliminated the overhead space for an air cleaner. This carburetor contains many of the same design features found in other Holley Carburetors of the time period. The main fuel flow is metered by individually flow tested fixed jets. The extra fuel necessary for high power output is delivered by a fully automatic vacuum operated piston type power enrichment system. The accelerating pump incorporates a spring over riding feature which prolongs the discharge of accelerating fuel to provide a smooth positive pickup. This carburetor includes a dash pot on vehicles with an automatic transmission. The dash pot helps keep the throttle from closing too fast when the driver takes his foot off of the gas pedal. The model 885-FF carburetors are composed of three major components. The air horn, the main body and the throttle body. The air horn contains the power valve piston and stem assembly, air bleed passages and the choke mechanism. The main body contains the fuel inlet and float system, accelerating pump assembly and all the metering parts except some air bleeds and the idle adjusting needle. The throttle body contains the throttle mechanism, the idle adjusting needles, distributor advance vacuum passages and the dashpot when equipped with an automatic transmission. The governor is also a part of the throttle body when so equipped.
Governor System Carburetor Model 885-FFG series incorporate the Holley Centri Vac vacuum operated engine speed governor. The governor consists of two units, a throttle limiting mechanism which is attached to the throttle shaft of the carburetor and a separate controlling unit. The throttle limiting mechanism consists of a governor spring and a diaphragm which is exposed to carburetor vacuum. The spring and diaphragm are linked together by the governor lever which is attached to the throttle shaft of the carburetor. The controlling units consists of a rotor which is driven by the engine and contains a centrifugally operated governor valve. Below governing speeds, the vehicle operator, through a simple dog clutch arrangement on the throttle body of the carburetor, controls the throttle plate and consequently, engine speed and power output, in the usual manner. When governing speed is reached, a combination of manifold vacuum and carburetor venturi vacuum acts on the governor diaphragm to close the throttle plates. Two calibrated by pass jets in the vacuum passages meter the vacuum from the carburetor and the manifold to provide the correct balance for proper operation of the governor. At speeds below governing speed, this vacuum is weakened by air flowing through the governor valve so that no premature governing action will occur. Filtered air from the carburetor air cleaner enters the governor system through the governor vent tube. The air flows through an air line to the housing enclosing the governor rotor. Governor vacuum draws the air past the governor valve and through another air line to the throttle limiting unit on the carburetor. When governing speed is reached, centrifugal force acting on the rotor, which has kept pace with engine speed, overcomes the tension of the valve spring and tends to close the governor valve. This greatly restricts the amount of air bleeding through to the diaphragm on the carburetor, thus allowing the combined carburetor and manifold vacuum to operate the diaphragm. As the vacuum acting on the diaphragm increases, the diaphragm moves the governor lever against the tension of the governor spring to close the throttle plate. The governed engine speed is held constant by centrifugal force on the valve balanced against the tension of the valve spring. Any slight change in engine speed will cause the governor valve to act immediately to either increase or decrease the amount of air bleeding through the governor valve orifice. A change in the amount of air bleed will, in turn, cause an instant response from the diaphragm to increase or decrease the throttle plate opening. When the accelerator is released, control is taken from the governor by the external throttle lever and the return spring in the accelerator pedal linkage closes the throttle plate to bring the engine to any desired lower speed.
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Marine Carburetors |
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Carburetors Rebuilt |
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Throttle Shafts Repaired |
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New & Used Carburetor Parts |
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Mike’s Carburetor Restoration 360 347-1077 |
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