Condenser bushings are a bit of a misnomer, since they do not change the “pitch” of the gas. What the bushings do is to allow you to alter the radius of the inside of the collector. That is to say, the radius of the inside of the collector will vary with both the changing pressure and the air speed of the piston (and hence the return stroke of the piston). If you have ever had to replace a worn or broken piston, you may have found that it’s no easy task to remove the old one and insert the new one with the old one still in the way. To get around this, the new bushings permit you to use the old piston to turn the collector so that the new one can slide easily into place. This also means that the piston can be free to rotate inside the collector (and hence the return stroke) so that the end result is a lower resistance inside the collector.
Condenser bushings are primarily used on high pressure engines as a means of improving their efficiency. High pressure engines have their own unique problems with the blades which cause leaks and hence causes them to be much more prone to wear and tear than other engines. The dampening of the blade allows you to recover more of the lost heat by using less fuel and in turn giving you a saving on your energy bill. There are more advantages to the use of condenser bushings that are currently being studied, but for now they are proving to be highly effective.
You can find these bushings both in tool form and as part of a manifold. The tool form of the bushings are generally made from rubber and aluminum. They are available in many different diameters to allow you to get the right size or make for your application. The manifold generally comes with or without the bushings.