This humble pipe will be the vacuum reservoir on my Honda Pacific Coast PC800 fuel injection conversion project. I have been working for some time on converting this carburetted bike to fuel injection. One issue has been a fluttering manifold air pressure reading from the Manifold Air Pressure (MAP) sensor when it is hooked directly to the intake runners. The solution is to have a vacuum chamber to smooth out the pulses from the opening and closing of the engine valves. The pressure readings will still be correct but without the huge flutter problems.
I JB Welded in brass fittings to the two screw ends of the PCV pipes. Once everything is dry, I will bolt it all onto the bike under the plastic.