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Radiator fan shroud efficiency1/18/2024 An affect that most people don't consider is that your engine can come up to operating temperature more quickly with an electric fan because the fan doesn't turn on until a specific temperature. One huge advantage that electric fans offer is flexibility in when they are turned on. This can lengthen the life of the bearings in the water pump. ![]() Removing a belt-driven fan that mounts on the water pump reduces the load on the pump. Between the two types of fans, an electric fan offers an improvement in power delivered to the wheels. It places an additional draw on the electrical system, but this is a more efficient means of spinning a fan, and it has a smaller impact on engine drag. But in cooling, what makes a good fan is optimum airflow for cooling with minimum energy consumption (for maximum engine power and fuel economy).Įlectric Fans An electric fan completely removes the mechanical load of spinning the fan from the engine. Electric fans rely on electric energy from the battery and charging system. Belt-driven fans use mechanical energy directly from the engine. Which one is better depends largely on the specific application.Īll fans consume energy to spin. The full answer to this question is that both electric and belt-driven fans have their place. But it's not always the better cooling solution. We'll jump right into the heart of the matter: An electric fan is the better performance solution, freeing up maximum horsepower and mpg. In fact, we created the first high-performance belt-driven fan in 1962, and we were the first to introduce an aftermarket electric fan to the U.S. We manufacture both, so we're pretty unbiased on this topic. This debate is as old as the electric fan itself. Perhaps a trip to the junkyard with an SR20DET fan for comparison could lead to some more abundant alternatives.Which is Better - an Electric or Belt-driven Fan? We got ours from the SR20 Store in Gardena, CA, but it was a used part that they happened to have sitting around. The only drawback to this conversion is that the RB25DET fan can be tricky to find. Another benefit to the RB25DET fan is the more robust fan clutch which operates the fan more effectively. As you will see in this article, the RB25DET fan is not only larger in diameter but it also features nine blades versus the stock seven. Best of all, this is a low-buck direct replacement for the SR20DET. While stock is good, our research led us to upgrade to the larger RB25DET clutch fan assembly. Electric fans are an option but we insisted on sticking with a factory fan and shroud combination which has proven itself as reliable and effective for cooling this boost-happy powerplant. While it’s nearly impossible to get a CFM (cubic feet per min) rating on any stock Nissan mechanical fan assembly, it doesn’t take an engineer to tell you that a larger fan will flow more volume. For icing on the cake, the Koyo unit features a high-polished finish so it looks as good as it is functional. ![]() This high performance radiator is not only great at dissipating heat, but it also eliminates the stock plastic end tanks which can get brittle and explode under harsh driving conditions. Koyo’s racing radiator is twice as thick as the stock unit for increased coolant capacity and has a 100% aluminum construction. When bumping the SR20DET power output or even running a stock engine on the track, it’s obvious the stock radiator isn’t up to the task. The radiator for our application is a direct replacement for the S13 ('89-'93 240SX) with the SR20DET motor swap. Choosing Koyo was an easy decision because of the build quality and performance of their products. There are many companies selling upgraded radiators but none as well recognized in the import community as Koyo. Choosing the right parts for the job is just as important as the job itself. With everyone and their mama rockin’ SR20s in their 240SX, many of which now need a little TLC, we decided to get into a little cooling maintenance and upgrades.
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