GM Stepper Idle Adapter 17113598

thingiverse

This adapter converts a stepper idle motor, part # 17113598, from a GM vehicle, for use in a vintage vehicle with 9/16" vacuum lines. Please note the arrow on the shell that indicates air flow. Since it's important that the conical internal bore is smooth where it contacts the plunger on the stepper motor, I've also modeled a hone. You can print this out, glue on some 220 grit sandpaper, and smooth out the internal bore. I also printed this model with the bore facing up, so there aren't any supports inside the bore. I used ABS plastic with 100% fill, which seems to work well. There are two versions - one is as compact as possible, and one has 1.5" between the hoses. The longer one allows you to connect the hoses directly to the intake manifold on a Volvo B20E/F engine. Good luck with your project!