The smaller CFM fan will work fine for most cars but if you are endurance racing and doing hot pit stops the larger CFM fan is recomended. If you are not buying the radiator mounts with the fan shroud, please let us know in the notes section of checkout if you already own the AAF Rad Mounts so we can get your the proper install hardwareĬhoosing Fan size: While on track the fan will remain off and should only need to come on when the vehicle speed is low or stopped. We have only fit our shroud with our radiator mounts so we do not have any fitment info if you are still running the plastic (stock) mounts!!! The AAF Fan Shroud creates a vacuum to expand the fan’s ability to pull from the entire surface area of the radiator creating cooler temps under the hood with the benefit of 7 flaps that allow the most air to pass through when the car is moving. Seamlessly attaches to the AAF Radiator Mounts and mounts your Coolant Expansion Tank directly to the Shroud. Buy replacement Radiator Fan Shroud For Toyota Hiace RZH online today from Sterling Parts Australia. Equipped with 7 flaps to let as much air through as possible at speed and fits a 14″ fan. Forget about zip-tying your fan to your radiator! AAF has created a lightweight fan shroud for your E46 race car. This is to accommodate normal engine and radiator movement, and also the flex that occurs in the fan blades at higher engine rpm.Ĭhecking these measurements when running a belt-driven fan and a fan shroud will solve overheating problems and fan contact problems caused by improperly placed fans and shrouds.No more cheesy mounting for your fan. There should be at least 1 inch of clearance between the two. The last measurement you should check is the distance from the face of the fan to the radiator. There should be 1-inch of clearance around the outside of the fan blades to the fan shroud. This can damage the fan shroud and the fan. ![]() If there is not enough clearance, you run the risk of the fan contacting the shroud with natural engine movement and body flex that affects the radiator and fan shroud mounting. If there is too much space here, the fan won’t be as efficient as it could be in pulling air through the radiator. The other very important fan to fan shroud measurement is the distance around the circumference of the fan and the circular opening of the shroud. This causes dissimilar resistance along the length of the fan blades, which stresses them. It’s also important that the fan blades do not extend past the top, bottom or sides of radiator surface. Make sure you use Flex-a-lite spacers using any other brand with a Flex-a-lite belt-driven fan will void the warranty. The shroud allows the fan to pull air through the radiator’s entire surface area, increasing its efficiency. This is a typical radiator fan and shroud combination. It mimics the size of the radiator and then narrows to a cylindrical opening. You can use 1 or more spacers – up to 3 inches in total. A puller fan uses a shrouda piece of plastic or metalthat mounts between the radiator and the fan. We manufacture a variety of fan spacers to move the fan forward and rearward, letting you achieve the optimal position. If the blades are not far enough inside the shroud, the fan will pull air from around the shroud rather than through it. Instead it will create turbulence inside the shroud, spinning the air, but not efficiently pulling it through. Electric fans are a quiet, efficient upgrade on your classic car, but without a shroud, you're lucky if you're getting air flow through even. If the fan is too far inside of the shroud, it won’t pull as much air through the shroud as it could. Looking from the side of the engine, the fan blades should be half in and half out of the shroud. If you have a fan shroud, the position of the fan blades in the shroud is very important to maximize airflow. Most people that have cooling problems with a belt-driven fan at idle and slow speeds don’t have a shroud – their fan is drawing very little airflow through the radiator, and most of their cooling comes from ram air being driven through the radiator at speeds above 40 mph. Without a shroud, air will take the path of least resistance, pulling air from over and under the radiator instead of through it. If you rely on a belt-driven fan for engine cooling, a fan shroud is a must to pull the air through the radiator. ![]() The first thing we want to make sure is that you actually have a fan shroud. It’s critical that the fan be positioned properly within the fan shroud and that there is just enough clearance around the fan blades. If you’re running a belt-driven fan, there are a few things you need to do in order to maximize the engine cooling that the fan can provide.
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