Chase Bays Raised Filler Neck offers a unique set of innovative features. It was designed to solve a number of problems in an aesthetically pleasing and modular way. Originally it was used to increase the fill point for our Hidden Water Coolers as the height of the cooler was lowered. But the more you deal with the topic, the more things you notice that still needed to be changed. Let's start with the most obvious feature:
RAISED FILLING POINT
This is a feature that no other company offers. A major problem with some engines (especially engine swaps) is the difficulty of bleeding the system. The fill point on the radiator is lower than the coolant passages in the cylinder head or in the heater. This causes unsolvable air bubbles that continue to accumulate as the system circulates. Even if you use coolant bleed kits, the cap and overflow point will be placed below these coolant passages. This results in more liquid flowing out of the cap per second when the cap pressure level is exceeded. All in all, a topic that enthusiasts have been dealing with for decades.
The Chase Bays filler neck increases the fill point by 95,25mm from the center of the bottom port to the end of the cap seal (not the top). The overall height from bottom to top is 5,25 inches (133,35mm). It is installed by welding one of the adapters directly to the top water neck (see sample photos). The filler neck can also be attached directly to the water connector using a short piece of hose. This method requires up to 76,20mm more space, but in most cases this is not a problem.
THE MODULAR PRINCIPLE
Chase Bays has manufactured the inlet and outlet as -20AN female ORB threads with appropriate adapters to cover 99% of applications. This is another feature that no other company offers. The adapters are offered in:
• 1,38" standard hose connection (SR20DET, 1JZ-GTE/2JZ-GTE, all Honda, Subaru, Toyota) • 1,5" standard hose connection (RB20/25/26, GM LS V8, KA24DE)
• -16AN (1" inch inner diameter)
• -20AN (1,25" inch inner diameter)
Chase Bays also offers an option as "Raw Aluminum Weld-On" in case it is to be welded directly to the upper water neck. It is a regular hose connection, not black anodized, can be cut and then welded as shown in the sample photos below.
THE SIDE PORTS
There are two 1/8 NPT fittings on the filler neck, one on each side. These provide space for accessories that may need to be soldered in. Water temp sensor, fan thermal switch, freeze connector, etc. If there is nothing to add, we offer matching black NPT connectors for a seamless transition.
ONLY THE BEST MATERIAL
The filler neck is machined from 6061 billet aluminum, bead blasted, and then anodized in a satin black finish. The Chase Bays logo is lasered in white on both sides. It uses a Type A radiator cap, which is very common on imports. We optionally sell one of our own on this site. The overflow fitting is 1/8 NPT thread and has a 1/4 hose fitting standard.
MEASUREMENTS
Don't forget to add the matching coolant overflow tank, you can find it here:
CHASE BAYS coolant reservoirDelivery: 1 x Raised Filler Neck
Delivery time: 7-10 working days (from receipt of payment)