A resonator installed as part of your car or truck's exhaust system serves one main purpose — to resonate. It's sort of an echo chamber for your car's exhaust, preparing all of the loud noise coming from your engine for the muffler to silence it.
The maximum torque multiplication ratio in a torque converter is about
The piston skirt is the cylindrical walls of a piston. During manufacture, the surface of the piston skirt is left slightly rough which helps retain lubrication.
The piston skirt acts as a guide as the piston goes up and down in the cylinder.