Choosing a carburetor
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*Gas mileage is better with vacuum secondaries. | *Gas mileage is better with vacuum secondaries. | ||
*Mechanical secondaries are generally best suited to light, manual transmission vehicles or automatic vehicles with the correct stall speed torque converter and correct rear gears to match the engine and carb. | *Mechanical secondaries are generally best suited to light, manual transmission vehicles or automatic vehicles with the correct stall speed torque converter and correct rear gears to match the engine and carb. | ||
| − | *Mechanical secondaries are preferred for racing applications. | + | *Mechanical secondaries are preferred for racing applications. In some cases the fact that the secondary jets can be changed in the double pumpers and there's an extra accelerator pump to deal with, some may find it harder to tune than the simpler 4160 type Holley. But once the process is understood the tuning becomes much easier, plus the added adjustability that was a hurdle at first becomes an asset. The 4160 needs the metering plate replaced or modified to use jets if the secondary air/fuel ratio is off. |
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