So I have a small update. I have more done on the exhaust than this but I’m going to wait til more of it is complete before the “reveal”.
So the collector at the turbo flange is actually very difficult to make. It’s non-planar and asymmetric. I actually got pretty close to getting it with conventionally fitting techniques but figured I could do better if I used some modern tech. So…
Drawn in cad. You can see that the elbows aren’t even pointing in the same direction or in the same plane:
Got my brand-new repop BSA tank in from india (200 bucks shipped, not bad… took them several weeks to make it, though). Started sectioning it for an oil bag. There will be about a 1/4" air gap between the two with hidden mounting hardware so the oil tank will be just kind of floating there. I lined the cut line up with the OEM kick panels for the tank.
One major problem is that the tank only holds 2.5 qts. I’m going to run a remote filter and a small cylindrical cooler, so that should push me up over 3 qts, which is still on the low side for a turbo bike. I may make another “secret” reservoir somewhere. Play it by ear on that one.
Thought about using the seat tube. It’s 1.125 id so I could get a little bit of volume there, but not much. It’s about 18" long so it would give me about .3 qt or so. All the other tubes aren’t really practical for that.
Finished up the tank. At least the sectioning. Still need to modify the tunnel and add some fittings. I’m getting a lot better at tig welding too. The grind marks make it look a little wavy but its very square and smooth and flat.
It wasn’t until after I welded it all up that i realized how different the left and right sides of the tank were. I guess that’s india quality. Lucky for me once the tank is on the bike it will be unnoticeable. In this picture you can see the heat marks where I had to come back in and fix some pinhole leaks that I found when I was…
Next I sat down to finish the manifold. Some bad stuff happened, I’ll get to that, but here are some pictures. I KNOW they aren’t equal length, but I’m building a street bike, not a space ship. There may be a little function following form, but that’s the world we live in. I think it’s rad. I left some space in front of the points cover to possibly fit my relocated oil filter. There is more space in front of the motor for my turbo oil pump. Charge piping I plan to be sneaking between the seat tube and the cylinder, outlet from the turbine will be high parallel drag pipes.
Bad stuff. Found out my front head stead was held in w/ JB weld. That’s enough motivation to buy some aftermarket 3 bolt heads IF the exhaust flange/port locations are essentially the same. Anyone know for sure? Was looking at the Ultima heads. Are there any others, better ones? Help plz.
