E31 850i/ci Alloy Radiator
with Integrated Transmission Oil Cooler

A number of things contribute to cooling efficiency, e.g.; fluid capacity, fin design, material, etc. The surface area of the core is 376 square inches; this is the same as a stock radiator. Additionally, we use a high efficiency core similar to a stock radiator. High efficiency cores have more fins per inch, more tubes per core and more cooling capacity. Each row has a single, large tube. The flat side of the tube is in direct contact with the fins which transfers heat from the tube walls to the fins. Since the rounded ends of the tube are not in direct contact with the fin, this portion of the tube does not aid in secondary cooling. The more tubes per row, the more rounded ends, and the less direct contact there is between the tubes and the fins. ZA uses a single tube for better heat dissipation. Cooling improvement also comes from larger radiant surfaces on the tanks. The alloy tanks themselves have a high level of thermal conductivity which helps to dissipate heat into air instead of back into the engine.

This radiator is built to order. We must have your existing radiator prior to construction as the internal tranmission oil cooler is not available separately. Once your place the order, remove your radiator or provide suitable core and ship it to the address on the Contact Us page.

Product Features

Also Available

• E30 Cooling Solutions

• E36 Cooling Solutions

• E46 Cooling Solutions

• All of Our Cooling Solutions

Lifetime Warranty!
Zionsville Autosport guarantees our radiators for life to the original purchaser. Purchaser must provide proof of BMW coolant use at first installation and once every two years thereafter.

Made in the USA with Euro Aluminum Cores.