BMW E36 B48 Swap Expansion Tank Mount Kit

Complete your BMW E36 B48 engine swap with the STROM Motorsports Expansion Tank Mount Kit, designed to provide a clean, secure and straightforward solution for mounting both the engine coolant and intercooler expansion tanks in the E36 chassis.

Developed specifically for B48-swapped BMW E36 models, this bolt-in relocation kit allows you to use durable and lightweight factory F3X-style expansion tanks while positioning both cooling-system reservoirs neatly within the E36 engine bay.

The kit uses existing threaded mounting points from the original E36 airbox location, helping simplify installation without requiring unnecessary modifications to the chassis.

Designed for BMW E36 B48 Swaps

The BMW B48 uses separate cooling circuits for the engine and charge-air cooling system, meaning a properly planned expansion tank setup is essential when installing the engine into an E36.

This mounting kit provides dedicated mounting for both the engine expansion tank and intercooler expansion tank, creating a tidy OEM-style solution for your B48 conversion.

Factory-Style Expansion Tank Compatibility

The kit is designed around BMW F3X-style expansion tanks, allowing proven OEM cooling-system components to be retained in your swap.

Using the correct intercooler expansion tank is particularly important because the factory tank incorporates a check valve in the bleed line. This helps prevent coolant from the higher-mounted intake manifold heat exchanger from slowly draining back into the expansion tank.

Bolt-In Installation

Designed with ease of installation in mind, the kit utilises the existing threaded holes from the original BMW E36 airbox, providing a convenient mounting location without requiring extensive fabrication.

Key Features

• Designed specifically for BMW E36 B48 engine swaps

• Mounts both engine and intercooler expansion tanks

• Compatible with factory F3X-style coolant expansion tanks

• Uses existing E36 airbox threaded mounting points

• Bolt-in relocation design

• Nylon 3D-printed and laser-cut aluminium mounting components

• Provides a clean and organised engine bay installation

• Helps simplify B48 cooling-system installation

• Suitable for performance, track, race and road-going E36 builds

• Can also potentially be used with B58-swapped E36 applications

Expansion Tank Compatibility

Designed for use with the following BMW expansion tanks:

• 17138617045 – Intercooler expansion tank

• 17138677649 – Engine expansion tank

Please note: Expansion tanks are not included with the mounting kit and must be purchased separately.

The Complete Expansion Tank Solution for Your E36 B48 Swap

A modern BMW B48 engine conversion requires more than simply mounting the engine in the chassis. Correctly positioning and securing the cooling-system components is essential for creating a reliable and professional installation.

The STROM Motorsports BMW E36 B48 Swap Expansion Tank Mount Kit takes the fabrication and guesswork out of mounting the engine and intercooler coolant reservoirs, providing a purpose-designed solution that integrates modern BMW cooling components into the classic E36 chassis.