So it looks like I'm going to get a grant to build and test intake manifold designs this winter with the middle school kids. We're teaming up with the local science high school.
Anyway, I would like to start modifying from this base:
The brass bell you see to the side here is a vacuum operated lever that activates the variable geometry inside the manifold. Judging by the butt dyno, it is programmed to go off somewhere around 4000 rpm.
Here you can see the detachable half of the manifold. The primary runners go around the circumference of the plenum (and cut it out of the circuit). They are 41x33mm and they run 229mm around the plenum. This gives me a volume of about 310 cm^3 per runner, or 1230 cm^3 for the system. This measures until the point where they terminate under the plenum.
The main plenum is part of the secondary circuit that opens at about 4,000 rpm. It is roughly a rectangular prism and measures 232mmX56.5mmX71mm. This is a volume of approximately 938cm^3. This plenum dumps directly into the runners and is actually smaller, volume wise, than the primary circuit.
This shows you the other half of the manifold. You can see the valves that control the secondary circuit. The primaries do not interact with the secondary circuit until they dump right at the entrance to the runners.
The runners are 46mm in diameter and 215mm from the detachable section to the cylinder head mating surface. This works out to a volume of about 1120cm^3 per runner, or 4480 cm^3 total.
Here's the TB. It measures 54 mm in diameter.
I'd like to modify this manifold for multiple runner lengths while increasing performance and retaining the variable geometry function.
I welcome any and all ideas for moving this forward and would super duper welcome ideas for calculating resonances.
