BOE or Radium Coolant Tank? - LotusTalk - The Lotus Cars Community
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post #1 of 13 (permalink) Old 05-13-2016, 07:57 AM Thread Starter
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BOE or Radium Coolant Tank?

My tank is looking pretty bad and I'm going to replace it. Looks like these are the two major contenders. Any insight/recommendations on which to go with?

BOE:
Pressurized Swirl Header Tank ? BOE Fabrication

Radium:
Coolant Expansion Tank Kit for Lotus Elise/Exige
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post #2 of 13 (permalink) Old 05-13-2016, 08:08 AM
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BOE... It swirls and BOE continues to support and develop products for the Elise/Exige while Radium has pretty much quit Lotus. Support them back.
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post #3 of 13 (permalink) Old 05-13-2016, 08:10 AM
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My vote is for the BOE version. It has been proven, tested, and is solid. The radium does look a bit cooler, but the BOE one is on a few cars on the track. Totally worth the extra little bit. Also, I like the way the lines are set up on it better. Main return hose is a nice large exit port, which allows for fluid to return to the system quicker. Its also one return line as opposed to radiums dual return line, which means you will need to y them together...unless they are using a bottom port an inlet into the tank, and the other as an exit back to the engine.

Our coolant tanks have two inlets and one exit in and out of itself. So with that in mind...Radiums design is kind of backwards.

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post #4 of 13 (permalink) Old 05-13-2016, 08:20 AM
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BOE. I trust the folks who push the limits on these cars on the track day in, day out
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post #5 of 13 (permalink) Old 05-13-2016, 08:44 AM
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I have the Radium tank. As others have noted, it looks great and works well. It also has a swirl chamber built in.

Glen

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post #6 of 13 (permalink) Old 05-13-2016, 10:57 AM
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I believe the BOE tank requires removal of the stock air box to fit, if not can someone post pics of their install? If you no longer have the stock air box and have the BOE intake this will not matter.
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post #7 of 13 (permalink) Old 05-13-2016, 12:55 PM Thread Starter
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Quote:
Originally Posted by LostPawn View Post
I believe the BOE tank requires removal of the stock air box to fit, if not can someone post pics of their install? If you no longer have the stock air box and have the BOE intake this will not matter.
Ooo hmmm... I have a cup airbox, so I'll have to double check that. It doesn't mention it on their site though. Paging @turbophil
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post #8 of 13 (permalink) Old 05-14-2016, 03:12 AM
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Seems to me that the most significant difference is that the BOE tank is set up to allow for running higher than normal pressure in the cooling system. If you're interested in that, then there's your choice. If not, then price, appearance, mounting location come into the picture. I've been running the Radium tank on track (12 psi TVS) for about a year with no problems.

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post #9 of 13 (permalink) Old 05-14-2016, 04:21 AM
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Quote:
Originally Posted by luxige View Post
Seems to me that the most significant difference is that the BOE tank is set up to allow for running higher than normal pressure in the cooling system.
Both manufacturers offer higher than stock pressure (I believe 1.1 bar is stock).

Radium sells their tank with a 1.1 bar cap and offers a 1.3 or 1.5 bar (about 22 psi) cap as well. BOE's tank has a Schraeder valve that lets you pressurize the system above what it would normally achieve on its own. They ship their tank with a 30 psi cap (about 2 bar) and recommend you don't exceed that on a stock system.

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Last edited by Glen; 05-14-2016 at 06:09 AM. Reason: Clarify wording
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post #10 of 13 (permalink) Old 05-14-2016, 05:43 AM
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I'm interested in this as well, as I will need to replace my stock tank. My concerns are a cup air box and catch cans that are mounted to the tank. What have you guys done to overcome this? Do I need to make custom mounts?

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post #11 of 13 (permalink) Old 05-14-2016, 10:21 PM
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Quote:
Originally Posted by Glen View Post
Both manufacturers offer higher than stock pressure (I believe 1.1 bar is stock).

Radium sells their tank with a 1.1 bar cap and offers a 1.3 or 1.5 bar (about 22 psi) cap as well. BOE's tank has a Schraeder valve that lets you pressurize the system above what it would normally achieve on its own. They ship their tank with a 30 psi cap (about 2 bar) and recommend you don't exceed that on a stock system.

Glen
I was unclear, Glen.
By higher than 'normal' I meant higher than what you can get just from the heat carried in a stock system. I put a Stant cap on the Radium tank, 1.4 bar iirc. The hoses and connections seem to be happy so far.

Walter, the Radium tank works with a Cup airbox, and leaves room for typical catch cans such as Radium or Saikou Michi.
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post #12 of 13 (permalink) Old 05-15-2016, 03:56 AM
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I just recently replaced mine with Radium. I am very happy with it and it was an fairly easy swap. It swirls, looks great, and does what I need it to do. It does not come with a cap, you can select one of 3 different pressure caps. I stayed with the soick 1.1 bar as I do not track mine and just needed a functioning tank for my sexy lady. I was fortunate that Radium is local to me and I was able to swing by and pick it up same day!!
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post #13 of 13 (permalink) Old 05-15-2016, 08:40 AM
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I can't speak of virtues of BOE version other than other stuff I have from them is topshelf.

So is Radium. I have their unit. I have the Cup Airbox, with Satochi catch can arrangement.

I went with 1.3 bar cap. The unit is nice. I cannot complain.

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