Air Horns in GTA Box

[genericwood]

Just curious how others are securing the air horns to the carburetors
when using a GTA style air box? The normal retaining clips won't work
with the thickness of the fiberglass. Previously, I used small
springs mounted through the lip of the horn and pulling back toward
the carb, but I'm guessing there is a better way. Anyone?

Erik

[OldAlfaGuy]

First, you may need to come up with longer studs. I made my own, using bolts of the proper thread, with the heads cut off.

Then I scrounged around my local Ace hardware store until I found some small (maybe 1/2" wide) L-shaped metal brackets. I drilled a hole in one leg of the bracket to fit on the carb stud. I secured the bracket to the stud with the nut, and bent the bracket as needed until it layed up next to the air horn. I then used a hose clamp to secure the bracket to the air horn. Not very elegant, but it does the job. Since the air horns are the kind that slip into the barrel of the carb, I think you only need one bracket per air horn, just to keep it from vibrating loose. The other stud for each barrel has a nut and washer on it to secure the air box adequately to the carbs. So each air horn has nuts and washers for both studs, but just one retaining bracket.

Unless you use really short air horns, they may not fit inside the air box, depending on which GTA air box design you have. They say even the curved air horns don't fit some "GTA" air boxes. Apparently, the shapes of the air boxes vary slightly. I wanted to use as long an air horn as possible, so I got a set on eBay that are fairly long (maybe 60-70 mm long, not counting the length the slips into the carb barrel) and angled 10 degrees. The angle allows them to fit just right. My interference was in the floor of the air box, so rotating the air horns until they were tilted up 10 degrees did the trick.

I hope this makes sense and helps give you ideas.

OldAlfaGuy