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I have decided to add a header tank to the cooling system on my xflow engined Westfield. I have been running without a header tank since getting the car and in the main have not had any cooling issues. However, in the recent +30℃ weather, it has been getting very warm when caught in traffic jams so I thought I would add a header tank to try and improve the situation. The added bonus is avoiding having to check/top-up with water before every journey. I have purchased a Westfield specific header tank from ARF and have been researching the optimum cooling system layout. I wondered if anyone has done similar or has any advice/comments on whether this will layout will work well? The radiator has an outlet at the top but this is lower than the outlet on the thermostat housing. In my current setup, this outlet is capped off and will stay so in the new setup. Previously, the outlet at the top of the thermostat housing just went onto the road. As the 10mm outlet on the header tank will be the highest point, it makes sense to connect the two. As I understand it, I need to replace the pressurised cap that is currently on the thermostat housing with a non-pressurised cap. This way, the only pressurised cap will be on the header tank. Finally, the bottom of the header tank has a 19mm outlet to connect to the bottom hose, before the water pump. For the plumbing itself, I am planning on using a mixture of aluminium pipe and silicone hose as there are some lengthy distances to cover with silicone hose alone. Your comments (positive or negative) would be most welcome. I am trying to get it right first time and avoid a lot of trial and error.
After seeing Gary's header tank upgrade, I couldn't resist. So I got one, and a battery tray from Alloy Racing Fabrications. This now allows the bypass by the thermostat housing to return to the header tank, meaning that I've got a small amount of flow while the thermostat is closed. At the same time I used one of their fantastic, lay flat, battery trays. While I was at it, I've never been happy with the fuse box location on the scuttle. It leaves the wires showing, I like to keep things looking uncluttered so I've cut a aperture in the panel and sat it down in with rivnuts to bolt it down. Plenty of space between the gearbox and wiring underneath. Quite pleased with the look I think...