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E46 3-Series Aluminum Expansion Tank, Part 2: 3D Tank Design

Interested in picking up this awesome aluminum coolant expansion tank? Check out our pre-sale details linked below!

Mishimoto E46 3-Series Aluminum Expansion Tank Pre-Sale

Quick project update! As noted in our last post, we had finished collecting data points and dimensional information for the stock tank and were setting our sights on creating a tank of our own.

After pulling our engineers out from under shop vehicles, we set them behind the computer to get this project moving. Check out some of our initial 3D models!

Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model

And here’s a shot showing our fill-neck design and upper hose connection!

Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model

Below is a shot showing the quick-connect fittings located on the base of the expansion tank. As noted in our first post, these attach to the plastic plate on the radiator fan shroud. One of the ports will be capped on manual models.

Mishimoto expansion tank, 3D model
Mishimoto expansion tank, 3D model

Our tank is being designed to function with all stock connection points and will not require any vehicle modification for install.

Additionally, we are designing this tank to function exactly like the OEM unit in terms of internal chambers and pressure relief. Check out a couple cutaway shots showing our plans!

Mishimoto expansion tank, 3D-model cutaway
Mishimoto expansion tank, 3D-model cutaway
Mishimoto expansion tank, 3D-model cutaway
Mishimoto expansion tank, 3D-model cutaway

We still have to sort out some of the details regarding the sensor for the fluid level. The E46 utilizes quite a unique system, with a magnetic float and sensor contained within an isolated chamber in the tank. We touched on this a bit in the first post of this series and we will be covering this once we have a plan in place.

We will be working toward a solution for this in the coming weeks!

Coming Up!

Now that we have our initial design work complete, we can work up a functional prototype for fitment and functionality testing.

Thanks for reading!

-John

Interested in picking up this awesome aluminum coolant expansion tank? Check out our pre-sale details linked below!

Mishimoto E46 3-Series Aluminum Expansion Tank Pre-Sale

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