Inlet/ST Expansion tanks

Bmwfixerguy1

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Jun 5, 2017
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Haha yeah, I like your idea though. I could probably machine out some bungs that are the like the factory quick connect so you could use the factory line or use a an bung, an to Barb fitting adapter.

Also, search for aluminum coolant surge tanks, that might provide some better results.

Thanks bud! I actually found a few on ebay.. Something atleast to try out.. Found a classy little tank for a MINI.. I'm sure what ever I find will be slightly less capacity but I'm pretty confident half a liter isn't going to show an issue.. Of course adding capacity would be amazing but don't think so :/
 

Notmpwr

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Jul 5, 2017
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I think you'll be good on capacity, most modern surge style systems the expansion tank is just there so no air can enter the suction side, so as long as it stays covered in fluid continually you'll be good. maybe just run it a little low to allow for expansion if it's a really small tank. Just make sure the suction side is at the bottom and the steam vent is at the very very top. A baffle would be nice to prevent aeration but it should be ok.
 

Bmwfixerguy1

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Jun 5, 2017
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I think you'll be good on capacity, most modern surge style systems the expansion tank is just there so no air can enter the suction side, so as long as it stays covered in fluid continually you'll be good. maybe just run it a little low to allow for expansion if it's a really small tank. Just make sure the suction side is at the bottom and the steam vent is at the very very top. A baffle would be nice to prevent aeration but it should be ok.

Yup I'm gonna copy the way the bmw one works basically just a different shape and easier to "conceal" lol
 

Bmwfixerguy1

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I'll be able to just actuate the water pump at 100% with the isid and monitor if it can keep up.. If it can handle a few minutes at 100 percent and it's making it back quick enough to not let the tank go dry/too low than I should be fine and dandy!
 

brocke

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May 13, 2017
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Just use a diesel tank and cut the connector off and tap it with a 1/8 npt thread like this
I done this for a mate, works a treat

20170708_124336.jpg
 
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Bmwfixerguy1

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Jun 5, 2017
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Just use a diesel tank and cut the connector off and tap it with a 1/8 npt thread like this
I done this for a mate, works a treat

View attachment 4347

I wasn't aware that's what was stopping it to fit with the majority of charge pipes.. I see that gorgeous manifold was the case there.. Not the gorgeous manifold in my case lol
 

The Convert

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Jun 4, 2017
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I wasn't aware that's what was stopping it to fit with the majority of charge pipes.. I see that gorgeous manifold was the case there.. Not the gorgeous manifold in my case lol
That is not what causes fitment issues with stock manifold chargepipes. It's the main body of the expansion tank that interferes.
 

Bmwfixerguy1

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That is not what causes fitment issues with stock manifold chargepipes. It's the main body of the expansion tank that interferes.

Yes that's what I thought as well..
Thanks for clarifying bud! I broke down and bought the mmp brackets for now.. It will have to do till I get more creative time
 

R.G.

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Nov 17, 2016
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I refuse to replace a plastic tank with another plastic tank from the 335d. I still run my stock tank. Fixerguy, the one I've been eyeing is the GTR style tank. Large wide profile up top without a lot of clearance worry on the bottom. Top hemisphere of my engine bay has plenty of room lol.
 

The Convert

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I refuse to replace a plastic tank with another plastic tank from the 335d. I still run my stock tank. Fixerguy, the one I've been eyeing is the GTR style tank. Large wide profile up top without a lot of clearance worry on the bottom. Top hemisphere of my engine bay has plenty of room lol.
Plastic is only potentially a problem on the high heat side of the bay. Hell, the only reason I moved mine over was to move a heat source away from the intake filter and give myself more room to do a custom inlet for my Motiv kit.
 

R.G.

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Nov 17, 2016
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Plastic is only potentially a problem on the high heat side of the bay. Hell, the only reason I moved mine over was to move a heat source away from the intake filter and give myself more room to do a custom inlet for my Motiv kit.


115 degree weather, black hood. Car scolds you if you touch it. It's not uncommon for them to pop here unfortunately.
This is my other N54. Driver side expansion/steering res from the factory. Would get a setup like this if I gave 2 shekels about looking OEM.


IMG_6192.JPG