CSF 7046 Radiator for BMW 1 Series M 08-11 BMW 135i 07-11 BMW 335 2009+ Z4 BMW Z4 sDrive30i Z4 sDrive35i

Part number7046

With over fifty years of experience in radiator manufacturing, CSF is the clear choice when it comes to ensuring your BMW 1M/135i/335i/Z4's engine cooling and optimal performance. Designed for track or street use, this high-performance, all-aluminum radiator is a must-have for both high-horsepower vehicles and race cars requiring enhanced cooling efficiency in motorsports environments. This radiator features a 2-row core with CSF's exclusive B-Tube Technology: Unlike conventional "O" style oval radiator tubes, CSF utilizes specially engineered "B" shape tubes. These B-tubes are meticulously formed and then seam-soldered for a leak-proof seal. CSF can use a thinner, lighter aluminum material (with greater cooling efficiency) because this design is actually stronger than conventional "O" shape welded tubes. The design (inlet opening in the middle of the tube, seam-soldered) increases the surface area of the tubes' heat exchange by approximately 15% compared to conventional tubes – the efficiency of two smaller tubes versus one larger tube within the same space criteria. With B-tubes, a "dual-flow liquid laminar flow" can be achieved. CSF also utilizes highly efficient fin configurations that are carefully and precisely aligned to maximize airflow through the radiator core. The fin characteristics are meticulously measured and calculated for each application, and tested in a wind tunnel lab for maximum heat dissipation efficiency.

The CSF Radiator for BMW 1M/135i/335i/Z4 is a true "Drop-in fit" design, requiring no modifications for installation. OE-style mounting brackets are CNC-machined and welded for maximum strength. The inlet/outlet connections are designed to match OEM specifications, allowing you to use OEM or aftermarket hoses. Trust the cooling experts at CSF for the most efficient, high-quality, and reliable radiators.