I have a four cylinder side valve with a screw on radiator cap….I may not need an expansion tank but this is an EXCELLENT explanation for which I am very grateful indeed.
Thank You for sharing this really well thought out, and sensibly described video with us. I'm presently building a "The Edge Products" Buggy, which utilises a motor cycle engine. I may need to use a header tank (and an expansion tank), as I'm trying to keep the weight (including the radiator), as low as possible in the frame/chassis. Regards Johno
I have a question: how could the coolant in the expansion tank possibly be drawn back into the header tank or radiator? If you look at your pressure cap, there is a little brass disc in the middle of the tip which looks just like the anti vacuum one-way valve. These are fitted to stop a vacuum occurring which prevents collapse of the rubber hoses. So without a vacuum to suck back the coolant it would remain in the expansion bottle.
When the system heats, the water expands, pushing some out, past the cap valve. As the water cools it contracts, this will then create the vacuum you are refering to. Provided that the hose on the radiator overflow is in the bottom of the overflow tank then the same vaccum will suck the water back in the same way it went out.
It would be better to have a larger header tank or add another header tank and avoid using the unpressurised expansion tank which must be allowing oxygen into the coolant over time.
An expansion tank does just the opposite of that. It allows the coolant cap to burp out air in the system without spraying coolant everywhere. Since the hose inlet is always immersed in fluid, it does not allow gasses to re-enter the system.
I hardly ever comment on a video but that is a great explanation!! Thank you
By far the clearest explanation of this part of a cooling system I have found, thanks!
Spot on. It was brilliant
I have a four cylinder side valve with a screw on radiator cap….I may not need an expansion tank but this is an EXCELLENT explanation for which I am very grateful indeed.
Great explanation. I finally understand how they work, thanks!
Thank You for sharing this really well thought out, and sensibly described video with us. I'm presently building a "The Edge Products" Buggy, which utilises a motor cycle engine. I may need to use a header tank (and an expansion tank), as I'm trying to keep the weight (including the radiator), as low as possible in the frame/chassis. Regards Johno
good video, thanks AG
Thanks for making this video. Explained it brilliantly👍
This was a great video, thanks so much!
Thank you, sir, for explaining that to me in a way that I could understand.👍🤗
First class explanation.. Many thanks!
Would this remove the need for a filler cap in the radiator? i.e. you'd fill the radiator from this?
best explanation, the guy knows his stuff
I have a question: how could the coolant in the expansion tank possibly be drawn back into the header tank or radiator? If you look at your pressure cap, there is a little brass disc in the middle of the tip which looks just like the anti vacuum one-way valve. These are fitted to stop a vacuum occurring which prevents collapse of the rubber hoses. So without a vacuum to suck back the coolant it would remain in the expansion bottle.
When the system heats, the water expands, pushing some out, past the cap valve. As the water cools it contracts, this will then create the vacuum you are refering to. Provided that the hose on the radiator overflow is in the bottom of the overflow tank then the same vaccum will suck the water back in the same way it went out.
Thanks Boss, I was pulling my hair out trying to work out how to plumb in my charge cooler and didn't know if I need a header, or expansion tank.
Thanks. Very clearly explained but hard to find information!
nice video, well explained
Thanks. Perfectly explained.
Thanks so much !!! Excellent explanation your Awesome.
Very helpful!
Great job!
Now I understand!, Thanks so much for sharing.
Thank you
I have triumph stag but the expanding tank is lower than rad nearly these stags have tendency to overheat
How do I find the tanks he’s showing for buying
L.
www.carbuilder.com/uk/header-and-expansion-tanks#/pageSize=20&viewMode=grid&orderBy=15
He doesn’t say what brand tank that is I want to buy
well explained thanks for that
very useful :)
It would be better to have a larger header tank or add another header tank and avoid using the unpressurised expansion tank which must be allowing oxygen into the coolant over time.
An expansion tank does just the opposite of that. It allows the coolant cap to burp out air in the system without spraying coolant everywhere. Since the hose inlet is always immersed in fluid, it does not allow gasses to re-enter the system.