By John Haynes
This sequence of entire manuals supplies the house mechanic an in-depth examine particular parts of vehicle fix.
Read Online or Download Rochester Carburetor Manual - Techbook 2068 - 1,2,4 Barrel, Tuning, Repair, Overhaul, Modifications (Haynes Manuals) PDF
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Extra info for Rochester Carburetor Manual - Techbook 2068 - 1,2,4 Barrel, Tuning, Repair, Overhaul, Modifications (Haynes Manuals)
Both approaches provide correct air/fuel mixtures and both operate in a similar and satisfactory manner. Slots are more typical, however, because they're cheaper to machine. But ports or a slot, this is the important thing to keep in mind: When the port/slot is above the throttle plate, it's an air bleed; when it's below the plate, it's a fuel discharge port. Another peculiarity of off-idle systems is the adjustable off-idle air bleed used on some emissions carburetors. A sepa rate air channel bleeds air past an adjustment screw into the idle system.
And since the jet provides very little restriction to low flow, little turbulence is created as the fuel comes out of the jet into the main fuel well. But as the throttle is opened fur ther, higher airflow through the venturi creates a greater pres sure difference in the main metering system. As the flow through the main jet increases, more fuel must go through the small hole in the main jet, creating greater turbulence. Interest ingly, as the pressure difference increases across the main jet, the proportion of fuel flowing through it for a given pressure difference is less.
By amplifying the signal available for main system opera tion, the boost venturi enables the main circuit to function well even at lower speeds and, therefore, lower airflows. This ability is even more advantageous in high-performance carburetors because a boost venturi doesn't seriously impede the carbure tor's airflow capacity. Booster Venturis have a number of advantages, the most important of which are the following. First, the trailing edge of the booster venturi discharges at the low-pressure point (vena contracta) in the main venturi.