Building an ITB (individual throttle body) setup

We had a customer come to us with an OEM manifold and a set of throttle bodies from a motorcycle.  We merged the two together, we didn’t get any photos building an ITB, but here is a photo of the final product.

We simply cut the OEM manifold off at the runners (roughly where the welds are) and sanded the surface down till it was flat and so that the spacing for the center two runners were straight.  We then bead blasted the manifold to clean it up prior to any fitting or welding.  Once the manifold was cleaned we cut four Ø1.5″ 0.064″ thick 6061-T6 tubing to adapt to the individual throttle bodies.  The tubes were ovalized on one end and fitted up with existing runners.  Once completed we tacked the tubing onto the runners and then welded them in place.  The little beads at the end of the tubes are to ensure that the hose clamps that are securing the rubber tubing doesn’t slip.  It’s an alternative way to having the tubing bead rolled.