THE X-450 MIXER


The newly-designed air-fuel mixer (as seen above top, right) that combines the best features of the venturi and air valve designs. Adaptable to one-, two-, or four-throat throttle bodies, the maximum air flow capacity is 450 cfm (the same as a 350 CID engine at 5200 rpm).

The X-450 design consists of an air-fuel mixer adapted to one, two, four throat throttle bodies.Gasoline carburetor throttle bodies may be utilized, or the carburetors may be ordered complete as designated by the customer.

Distributor inventory can be minimized by stocking mixers and throttle bodies separately for flexibility in the meeting customer demands.The X-450 air fuel mixer is a hybrid of a venturi and an air valve (constant velocity) design, with advantages of each.

A venturi is used to introduce fuel radially through 12 ports around the inner circumference of the venturi. A piston operated air valve is positioned in and above the throat of the venturi, with no restrictions downstream to disturb mixing of the air and fuel or reduce optimum air flow.

Attached to the air valve are three gas metering valves spaced 120 degrees apart which introduce fuel to the venturi eventually around its circumference. This is accomplished by use of two annulus chambers surrounding the venturi enclosed by the outer wall of the mixer body. A circular ring separates the upper and lower chambers.

Fuel from the converter enters the lower chamber through a one inch N.P.T fuel inlet port. The circular ring has three ½" orifices allowing fuel to pass from the lower to the upper chamber. These orifices are spaced radially 120 degrees apart. Within these orifices, the three gas valves meter fuel flow to the upper chamber in response to movement of the air valve as it measures air flow trough the mixer according to the demands of the engine speed and throttle opening.

Several months of designing resulted in one prototype mixer made of wood, three sand cast prototypes, each modified to test design improvements, and the final design in die cast form. Construction of the mixer is such that the air valve is guided internally and externally for stability of the vertical movement and minimal wear of moving parts.

The gas metering valves are attached to the air valve with unique universal joints which allow lateral alignment as well as angular deflection for friction-free movement through the guides. The moving seal between the air valve piston and the surrounding cylinder is a 7/16" diameter "O" ring. Wear of the "O" rings in prototype carburetor has been nil. The pressure differential sealing the "O" ring against the cylinder wall is only 6" of water column to a maximum of 16" (approximately six ounces) per square inch. To minimize the possibility of any problem with swelling of the "O" ring due to heat or deleterious oils, the "O" ring is not completely closed. A gap of approximately 1/16" is left open when the "O" ring is installed. The leakage of air through a .062" by .002" wall clearance has no discernible effect of an air valve lift.

Another unique design feature is a manifold vacuum operated piston which opens and air bleed to the vacuum chamber above the air valve at manifold vacuum greater the 4" to 5" of mercury column. The effect of this air bleed is similar to temporarily applying a heavier closing spring to the air valve. The result is increased air velocity of the air flow through the narrowed opening between the venturi I.D. and the air valve O.D. The increased velocity more thoroughly mixes the fuel and air, and the lowered position of the air valve and consequent lowering of gas metering valves to a position where their shape restricts gas flow to a desired lean mixture for light to moderate engine loads, provides automatic richening and leaning according to load conditions without need for an additional mixture adjustment.

The X-450 power and idle mixture adjustments are pre-set at the factory, requiring only minimal readjustment for differences in engine condition, P.C.V. valves or air cleaner restriction. Idle mixture adjustment is ideally made when the engine is cold (in gear if an automatic transmission). AS the engine coolant heats, the gas fuel will heat and expand slightly in relation to air temperature, leaning the idle mixture however with increased engine temperature, the idle will remain smooth and economical as the fuel consumption.

There is one additional feature has proven effective in maintaining a stable idle mixture. This feature provides a fixed air inlet port when the air gas valve is closed. This air opening is matched by the adjustable idle fuel opening to provide matching orifices which do no vary in operation. The effect is similar to a tiny venturi carburetor with high velocity air passing through it. The engine will idle with the air valve closed, and the idle mixtures remain completely stable. Another feature is a spring loaded washer closing the air valve at rest, which also relives pressure from possible backfires of the engine.

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THE X-1 VAPORIZER-
REGULATOR

2-stage LP-gas converter for applications up to 350 HP. The innovative design reduces the number of parts and provides a long, trouble-free life and satisfactory performance.

X-1 Features:

-- Compact Design

-- Unique Heat Exchange

-- Pressure Stability

-- Easy to Install!

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