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  • TracTuff RBB/ RBC Rear Wheel Drive K Swap Water Neck


    The RWD upper water neck addresses a few concerns with the growing popularity of the k swapping a number of front engine rear drive chassis. Now fabricated with a one piece tube!!!

    Normally, the water neck is pretty much right in front of the radiator and the two points are pretty much equal in height... and even then, the K is notorious for being a real bitch to bleed! Rotate the motor 90° and now you have make the radiator hose either go up and over or down and under the intake manifold. Both will present problems, but one is uglier than the other, so down and under it is. Lucky for you, I have created a fixture based off of the S2000 outlet, had custom tubes bent, and have welded them to my billet RWD housing... essentially mimicking the geometry of the factory S2000 intake manifold/ water neck assembly.

    This option has allowed K swapped S2000's to reuse the factory upper hose and I'm starting to see more and more Non-Honda swaps going to that hose to solve there unique swaps connection issue. The only short coming of this design, is that when taking the cooling systems highest point and ask it do dive down under the intake manifold, you are creating a HUGE pocket for air to collect! For this reason, I highly recommend a swirl pot, a fill pot, a filler neck, or at the very least... a vent (pictured) (listed in order of best, better, good). Each of those product offers a way to eliminate the air on initial fill up where the best option constantly deaerates the coolant (read more).

    NOTE: Made to Order - Contact for ETA - If you are interested in a running AN lines or a specific design, please email sales@tractuff.com. The tube is welded so that it sits similarly to the OEM S2000 water neck outlet position when the engine sits at its original 15° lean to the passenger side (exhaust side). The billet neck has a 1/2" NPT heater port and the hardware kit includes a 90° hose fitting and a plug in the event you don't plan on connecting a heater hose. The Skunk2 Ultra Street and Ultra Race intake manifolds require a small change to the outlet position in order to avoid the plenum flange but the end of the tube is still VERY similar to the OEM S2000 water necks outlet position.