Twin Cam & Milwaukee Eight Piston Jet Test StandJims piston jet test stand TC + ME17 UP Do not let malfunctioning piston jets cause engines to sump or overheat, test them before you install them. Located deep inside the engine cases it is hard to verify whether these piston jets are functioning properly. Not any longer as this Jims piston jet test stand allows engine builders to test them for proper operation before installing them. The unit operates on both compressed air, and air over oil. When