TracTuff RBB/ RBC Rear Wheel Drive K Swap Filler Neck
RBB/ RBC Water Neck Flange - V2 and subsequently all products made from that flange are on Back Order as of 10/6/21. I should have product within the next 3-4 weeks. Do NOT inquire if the product is still on back order; I will remove this message when they are back in stock. You can place an order while they are on Back Order and they will automatically ship when back in stock. Take advantage of the discount now as the sale price will end when they are back in stock.
The filler neck is substantial upgrade from the standard RWD upper water neck.
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 to 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 seems to be the most popular choice! To help, Pit Garage created a fixture based off of the S2000 intake manifold/ water outlet (position and angle) and I had custom tubes bent, weld them to my billet RWD housing... essentially mimicking the geometry of the factory S2000 combo and added a filler tube.
This option has allowed K swapped S2000's to reuse the factory upper hose; in fact... I'm starting to see more and more Non-Honda swaps going to that hose to solve there unique swaps connection issues as well. This product significantly reduces the headache of adding fluid and bleeding the system at its highest point. If space or budget allow, look into a fill pot or swirl pot for even better solutions.
NOTE: Made to Order - Contact for ETA - If you are interested in a specific design that varies from this, please email us at firstname.lastname@example.org. If you have questions related to the configuration or options... PLEASE visit the WHATS WHAT or FAQ page. The tube is welded so that it sits level when bolted to an engine leaned back 15° (OEM position) for the traditional option and leaned forward 8° (intake side) for the gangster lean mount option.
The billet neck has a 1/2" NPT heater port and the hardware kit includes a 5/8" hose fitting, a plug, four stainless M8 socket head bolts, and a Genuine Honda gasket. The filler tube is welded so that it sits level when bolted to an engine leaned back 15° (OEM position)
DISCLAIMER: 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. The filler tube helps bleed the system initially but doesn't continuously rid the section of air and will accumulate here over time.