Lokiel wrote:Nevyn72 queried about the tank's capacity so I filled it right up and measured it at 1,750ml - obviously you'd never fill it that full but note that in the photo above it doesn't have that missing chunk in the top left corner that the OEM tank has so I'm guessing it's more than OEM. When I install it, I'll measure the OEM tank at full capacity.
I'll save you the mucking around mate.
I just measured the capacity (filled completely) of my old SE tank so the results are:
- Standard NB header tank = ~1200cc (16mm radiator)
- Standard NB SE header tank = ~1500cc (27mm radiator)
- Aftermarket Aluminium tank = ~1750cc (?mm radiator)
Now if you are using a larger aftermarket radiator, like a Koyo 37mm, or other manufacturer's 41/42/51mm radiator you have a larger volume of coolant in your system.
This means there is a greater amount of expansion and contraction of the volume of coolant from hot to cold. Hence a larger header tank is a good option to consider to allow a larger 'buffer' of capacity in the situation where a slow leak may develop for whatever reason....
To demonstrate this point, I have a larger radiator (Koyo 37mm) paired with a smaller header tank (standard NB) and it sits on the 'low' mark when cold and the 'high' mark when hot. If a slow leak developed it wouldn't take long before the header tank is drained completely and air is drawn into the coolant system before noticing the problem.
