Rochester Carburetor Manual - Techbook 2068 - 1,2,4 Barrel, by John Haynes

By John Haynes

This sequence of finished manuals offers the house mechanic an in-depth examine particular components of car fix.

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Extra info for Rochester Carburetor Manual - Techbook 2068 - 1,2,4 Barrel, Tuning, Repair, Overhaul, Modifications (Haynes Manuals)

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First, because of the sizable closing force generated when manifold vacuum is high - which it is at idle - throttle plates with offset shafts return to idle more consistently. Sec­ ond, offset shafts are a safety measure. In the event you should accidentally fail to reconnect the linkage or throttle re­ turn spring, they prevent over-revving the engine because air­ flow past the throttle plates tends to close them. One popular misconception about the throttle is that it controls the volume of air/fuel mixture that goes into the en­ gine.

A sunken float opens the fuel inlet valve, overfills the float bowl and causes an excessively rich air/fuel mixture. Newer floats are made from a closed-cell material that never leaks (though it can slowly absorb gasoline and lose its buoyancy) and is im­ pervious to gasoline and fuel additives. Whatever material is used, the float must be buoyant enough to shut the inlet valve when the bowl is full. One of the advantages of a closed-cell float is that the closed-cell material is more buoyant than brass, so a smaller float can maintain a constant fuel level as well as a larger brass float.

This bottleneck restriction is known as a venturi. When the air molecules arrive at the venturi, they not only crowd together, they also speed up. Once they get through the venturi, they slow down again and resume their original speed (see illustration). B. " The molecules in any material, air included, are always moving around a lot. The molecules of air moving through our hypo­ thetical tube are bouncing off the walls of the tube and off of each other, which is what creates the pressure. As they speed up through the venturi, they become more directional, so they have less time to bounce off the walls or each other, so the pressure decreases.

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Rochester Carburetor Manual - Techbook 2068 - 1,2,4 Barrel, by John Haynes
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