Anybody have any experience with adding a "thunderjet" or "powerjet" to their carb. Here is what they claim in their ads. There is another company that makes something similar as well.


ThunderJet style third fuel circuit has a built-in air correction system that permanently solves the problem of poor mid-range and/or lean top-end performance. Made in the U.S.A.

The ThunderJet™ style powerjet is a jetable, externally mounted third fuel circuit that improves the performance of S&S and virtually any other style carburetors. Unmodified, these carbs typically have a low speed (or intermediate) circuit that supplies fuel from idle to approximately 2500 rpm, at which point the main jet circuit becomes active,delivering fuel to the engine. These two circuits must then supply fuel for the rest of the rpm range. The remaining rpm range is too wide (typically 2500-6500 rpm)for only 2 circuits to handle efficiently. In a performance application, the tuner generally encounters problems jetting a carb to give good, crisp mid-range response and still have strong top-end power.

Usually, a compromise is the result. Back the main jet down, carburetion in the mid-range is good but top-end is lacking. Increase the main, top-end improves but now the mid-range is rich; flat spots or hesitation is encountered. The answer?

A ThunderJet™ style powerjet external third fuel circuit !!

ThunderJet™ style powerjet is a high speed fuel circuit,delivering needed fuel to the engine only at higher rpms (4500 & up). You can now use the main jet to tune for smooth, broad mid-range power, and supplement the top-end with the ThunderJet™ style powerjet. Jets are used to control the amount of fuel sent to the engine. Join thousands of satisfied customers worldwide, install a ThunderJet™ style powerjet.

 

I'm no expert but.... I'd rather have a nicely set up Carby without some external junk on it. It sounds like it would work though.