How much water do you need in your header tank? Working out custom tank size help
#1
How much water do you need in your header tank? Working out custom tank size help
What denotes the size of a cars header thank? How much water it holds etc?
I have limited space/places to put one in my fiesta so will make up my own custom shape one to fit somewhere nice and snug but is there a specific way of working out its capacity etc?
Fords wrc tanks were small and obviously worked fine,
Also does it need to be the highest point of the whole system or just above thermostat level roughly
Thanks
Marc
I have limited space/places to put one in my fiesta so will make up my own custom shape one to fit somewhere nice and snug but is there a specific way of working out its capacity etc?
Fords wrc tanks were small and obviously worked fine,
Also does it need to be the highest point of the whole system or just above thermostat level roughly
Thanks
Marc
#2
The header tanks primary role is to provide room for expansion. So as long as there is "some" water in it when cold, that should be all it needs. But it can be good to have an excess of water purely as it increases the volume of coolant to the entire system.
"Some" is only really required so you can actually see the actual cooling system isnt dry. And in some ways, the more air space, ie expansion room the better. But that's the main role of the bottle. Too little and it can get blown out.
Too much....cant cause any problems.
"Some" is only really required so you can actually see the actual cooling system isnt dry. And in some ways, the more air space, ie expansion room the better. But that's the main role of the bottle. Too little and it can get blown out.
Too much....cant cause any problems.
#4
And ideally yes it should be the highest point in the cooling system. this enables any air to accumulate in the tank, and not form airlocks elsewhere. Also why any air bleeds always route to the tank.
#6
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Hey Marc, if you give Andy G a ring he'll tell you what dimensions the he made for mine was. It's a decent Group A lookalike and would look ideal and save space in yours
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I once remember an event did, sat on the start line, water temps all good, sat at 90deg, helmet on, you can't hear the engine too much only the co-driver, so, on the stage, doing really well, car starts losing power, hmm strange, looks at temp guage and for some reason, its gone back to zero, hmmmmm maybe the sender has broken, maybe the wiring has broken, thinking all this flat out (well was flat out till losing power) down shift, even less power, oil temp ok, water temp at zero.
eventually pulled over, and car had overheated (you can't tell engine temp in a rally car as it's fecking hot and fast as it is), only after a few mins of engine off did i realise that the water temp guage was not at zero, well it was, but it had gone all the way round back to zero off the top of the guage
Hence i alway use level sensors too
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