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you’ll be able to get the TIG torch all the way around the boss to do a good weld. Also be sure to
check that you’ll have cowling clearance for the boss and fuel fittings feeding it.
Weld-in injector boss Make oval hole in induction tube
Mark the outside of the tube where the boss will be placed. Find the center of your mark and center
punch it. Drill a 1/8 inch hole through the tube. Enlarge to 7/16 with a step drill. Take a 7/16 drill bit
and put it straight through the hole. Lean the drill down slowly so an oval hole is cut into the tube to
match your injector boss (45 degree angle). Line up the boss carefully with your hole (a cut off 7/16
bolt through the boss base, clamped in place, can help align it while tacking). Carefully tack the
bosses in place, recheck fit and clearance. Remove the bolt before final welding. Final weld in place
once you are satisfied everything is right.
Injector boss welded in place ( Lycoming)
Lycoming Parallel Valve Engines
On these, you have the option to use our dedicated injector mounting system which mounts the EFI
injectors directly into the existing 1/8 NPT injector holes on the top of the heads. These use a special
high strength stainless steel lower portion for low heat transfer and a floating 7075T6 bolting flange to
hold the injector cap in place. We fit a stainless steel body injector for maximum temperature
resistance.
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