I've used commercial oil restrictors for my T61 turbocharger but really dislike the appearance of back-to-back fittings so I decided to make my own "stealth" restrictor instead.
The fitting that goes into my turbo CHRA is a 1/8" NPT to 37deg JIC flare elbow. I drilled and tapped the 1/8" NPT end to accept a 1/4" x 20 set screw, then drilled out the set screw with a 1/16" (0.0625") hole. Cleaned out all the shavings really well, added some Loctite Red for insurance and voila.
The job took all of 20 minutes to do and looks far better than the commercial ones. Best of all, it's easily modified by simply drilling another set screw larger or smaller.
If I'd been really clever, I would have done the mod to the JIC flare end instead of the NPT. This would have made it physically impossible for the set screw to back out and cause any damage, however I wasn't confident enough of my drilling ability with a handheld drill to keep from screwing up the JIC flare surface. Maybe next time, if I can jig it up and do it with a drill press......
The fitting that goes into my turbo CHRA is a 1/8" NPT to 37deg JIC flare elbow. I drilled and tapped the 1/8" NPT end to accept a 1/4" x 20 set screw, then drilled out the set screw with a 1/16" (0.0625") hole. Cleaned out all the shavings really well, added some Loctite Red for insurance and voila.
The job took all of 20 minutes to do and looks far better than the commercial ones. Best of all, it's easily modified by simply drilling another set screw larger or smaller.
If I'd been really clever, I would have done the mod to the JIC flare end instead of the NPT. This would have made it physically impossible for the set screw to back out and cause any damage, however I wasn't confident enough of my drilling ability with a handheld drill to keep from screwing up the JIC flare surface. Maybe next time, if I can jig it up and do it with a drill press......
