There have been a number of ways posted out there to make your own oil restrictor fittings and save some money, from using JB weld to rivets but here is another that I am trying.
The ID of the AN fitting was 3/16" so I used 3/16" bronze welding rod for the restrictor. A 3-ft stick was $2 and it is slightly oversize.
The key is getting the rod to just a slight press fit so it will go in place with just enough force. If you don't have expensive machine tools, you can manage it with a sturdy drill press to both file the rod diameter(smooth file) and to press the bronze in place.
I cut a .500 piece and drilled the back half 3/32" and the front half #60(.040) to make the orifice. I also took the "belt and suspenders" route of applying a miniscule amount of JB weld to the bronze before inserting it and also staking the steel very carefully around the edge with a sharp punch (arrow).
You can check the orifice with the #60 bit for patency and the opening from the back side by looking thru it at a bright light.
Brass would have been better and easier to work with but I am not aware of any compounds in aviation oil that will affect bronze.
Dave A.
6A build
![restrictor0.jpg](/community/proxy.php?image=http%3A%2F%2Fpages.suddenlink.net%2Ftismuoi9%2Frestrictor0.jpg&hash=850a8c9745fe0ec51aff2887b0af2214)
The ID of the AN fitting was 3/16" so I used 3/16" bronze welding rod for the restrictor. A 3-ft stick was $2 and it is slightly oversize.
The key is getting the rod to just a slight press fit so it will go in place with just enough force. If you don't have expensive machine tools, you can manage it with a sturdy drill press to both file the rod diameter(smooth file) and to press the bronze in place.
I cut a .500 piece and drilled the back half 3/32" and the front half #60(.040) to make the orifice. I also took the "belt and suspenders" route of applying a miniscule amount of JB weld to the bronze before inserting it and also staking the steel very carefully around the edge with a sharp punch (arrow).
![restrictor.jpg](/community/proxy.php?image=http%3A%2F%2Fpages.suddenlink.net%2Ftismuoi9%2Frestrictor.jpg&hash=44c9e0b7ac4e177a40ee72c794f9f7ee)
You can check the orifice with the #60 bit for patency and the opening from the back side by looking thru it at a bright light.
Brass would have been better and easier to work with but I am not aware of any compounds in aviation oil that will affect bronze.
Dave A.
6A build