Threaded Injectors???

[anotheridiot]

I have a BBC RPM Air Gap and a SBC Hilborn I want to convert. I'm just being lazy on the Hilborn, but on the Air Gap, I was thinking it would be an easy and attractive way to secure the injectors so I could run individual hard lines instead of a stepped fuel rail.

Thanks,
Kevin

The hilbourne used 1/8" pipe taps on the 90 degree mechanical injectors. If you want to thread them in maybe you can get some brass pipe nipples and cut off the threads off the end and epoxy the injectors into the end of the pipe. The ID of the pipe is close to the 5/16ths you were mentioning, if you are really trying to get them to thread into the manifold. I see what you are getting at, where BK welded in bungs (nice work) you just figure threading them in at that point is pretty simple.
Those things fire so many times per second you gotta think any machine work at all is gonna mess with the internal screens or tiny ports the fuel is actually shooting out of. I'm just pretty sure they came up with o rings bungs for alot more reasons, including heat transfer. Think of how many other injectors they could sell if people kept stripping the threads.

[ka67_72]

On the Hilborn I'm going to put them on the inside and make hard lines on the outside for vac. I started milling the BBC intake for bungs. I'm going to weld in solid bungs and then mill them to the same depth.

Kevin

[BKBridges]

Looks good! We make our own bungs in three different heights. The height difference is all below the o-ring land. When we set a manifold up we evaluate the steepest runner condition and pick the size of the bung based on the slope to eliminate o-ring land erosion when you port back the welded-in bung. We find the center of the bung location, drill through there and then concentrically mill a pocket the diameter of the bung down until there is just a small shelf left next to the manifolds "rail" (the rest being a hole). Weld the bung in then port it back. Make sure to leave room for any additional porting if you are going that way vis a vis additional bung height. A picture would work better here, but I dont have anything thats unported to show...