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Now you've made me do the math:

60cm*50cm*1.25cm (my 1/2") = 3750cc = 3,750mL.

Go with two pieces of sheet metal as the lid separated by a 1/4 inch bar, and you have a 1.8L coolant tank. Battery box length and width were guesses.

350mL seems pretty puny for a surge tank. A coke can???
 

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Discussion Starter · #125 ·
The front bay is lower than your battery cooling plate, isn't it? If not, carry on...
I realised part way through writing my other post that I don't actually know which is higher, the radiator, or the battery cooling plate. However since the system forms a U shape, I wasn't sure if it matters, as air could rise both front and rear, and I also wasn't sure if it would simply be pumped out.
I will try to get a better idea of which point(s) in the system will actually be the highest. The original VX220 has a header tank at the rear, and also a (not very accessible) bleed valve at the front.
 
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