Adding a Fan Shroud
I had a thread on fabo that I put it in. After making the wooden buck, just stretch cotton fabric over the mold and staple it to the back. Then layer it up with about 4 coats of fiberglass resin. Letting dry and scuffing between each coat. When dry, pop it from the mould. You notice the mould has plastic on it to prevent the cotton fabric from sticking to it. Once you pop it out, flip it over and screw it down to a piece of plywood with screws thru the circular center part, now fiberglass the **** out of it on the inside. I used about 3 layers of 7781 thick weave fiberglass. Once that's dry, unscrew it from the plywood, and cut it out. You can then figure out a mounting system. I made pieces of 19ga steel sheet with fingers. I glued it in place w jb weld then drilled and installed countersink rivets in the tabs to also hold it, then bondoed over the heads to hide them. Where the hoses had to fit with u shaped cutouts, I filled those spots with JB weld, then ground out the u shaped notches.
The big key is making the wooden buck accurately so the fan is centered. The center circle I have measured 19.5" for an 18" fan. This gives me .75" clearance all around for engine movement. Fan is half inside the shroud to allow scavenging. The other piece to the buck I made in the shape of the radiator rectangle, taped a pen to the fan blade and rotated it. This gave me location of the circle for the fan. This was transferred to masonite board. I figured out the height and used 2x4 blocks to space out the round disc. Used all thread and nuts to assure the disc was centered until I screwed it down to the wooden blocks. You can see I used an old black pocket T shirt stretched over then wired and stapled to the back of the wooden buck to get the shape before putting fiberglass resin on it.
I am using same setup in my sons car, and will make another shroud, and mounting rails. I kept the buck and templates.
Pix of the buck.
I had a thread on fabo that I put it in. After making the wooden buck, just stretch cotton fabric over the mold and staple it to the back. Then layer it up with about 4 coats of fiberglass resin. Letting dry and scuffing between each coat. When dry, pop it from the mould. You notice the mould has plastic on it to prevent the cotton fabric from sticking to it. Once you pop it out, flip it over and screw it down to a piece of plywood with screws thru the circular center part, now fiberglass the **** out of it on the inside. I used about 3 layers of 7781 thick weave fiberglass. Once that's dry, unscrew it from the plywood, and cut it out. You can then figure out a mounting system. I made pieces of 19ga steel sheet with fingers. I glued it in place w jb weld then drilled and installed countersink rivets in the tabs to also hold it, then bondoed over the heads to hide them. Where the hoses had to fit with u shaped cutouts, I filled those spots with JB weld, then ground out the u shaped notches.
The big key is making the wooden buck accurately so the fan is centered. The center circle I have measured 19.5" for an 18" fan. This gives me .75" clearance all around for engine movement. Fan is half inside the shroud to allow scavenging. The other piece to the buck I made in the shape of the radiator rectangle, taped a pen to the fan blade and rotated it. This gave me location of the circle for the fan. This was transferred to masonite board. I figured out the height and used 2x4 blocks to space out the round disc. Used all thread and nuts to assure the disc was centered until I screwed it down to the wooden blocks. You can see I used an old black pocket T shirt stretched over then wired and stapled to the back of the wooden buck to get the shape before putting fiberglass resin on it.
I am using same setup in my sons car, and will make another shroud, and mounting rails. I kept the buck and templates.
Pix of the buck.
