There are two types of carburetors- double pumpers and vacuum secondaries. Both have their own set of benefits and drawbacks. Here’s a look at the key differences between these two types of carburetors:
Double Pumpers
A double pumper carburetor has two accelerator pumps- one for each cylinder. This design provides more fuel to the engine, which can result in increased power output. Double pumpers also tend to be less affected by changes in elevation and temperature than other types of carburetors. However, this extra fuel can also lead to increased engine wear and tear, as well as decreased fuel economy. Additionally, double pumpers require more frequent tune-ups than other types of carburetors.
Vacuum Secondaries
A vacuum secondary carburetor has only one accelerator pump but uses a system of vacuums to draw additional air into the engine when needed. This extra air helps lean out the mixture, which can improve fuel economy. Vacuum secondaries also tend to be more durable than other types of carburetors and require less frequent tune-ups. However, this type of carburetor can be sensitive to changes in elevation and temperature, which can affect performance.