Introduce you to our latest collection of shirts. An unexpected combination of sunflowers and famous car brands in the world. Even if you are a nature lover or a speed enthusiast, you will love them. And that’s Sunflower Ram shirt. From today I will be posting articles on overheating problems, fault finding of these problems and possible solutions. I will also write posts on interesting real life applications that I come across from time to time. I have over 20 years’ experience in the field, so feel free to ask me any cooling related questions. I will gladly help where I can.
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Foremost we are in the market place to sell our product range. There is however no sense in just selling a product without offering our customers solutions to their problems. I believe in helping people finding a solution to their cooling / overheating problems. Many times my advice will cost me a possible sale, but when I know that the product the customer is asking for will not solve his problem, I feel obliged to offer a suitable solution. Today I will be giving some insights into choosing and installing electric fans for automotive applications.
Airflow is to an automotive radiator like oxygen is to a human being. Without it, both will stop functioning. A fan is used to supply airflow to a radiator when there are not enough ram air available. This means that a fan only supplies efficient cooling airflow up 60 to 80 km/h (depending on the relative angle of the core to the airflow). Above these speeds the ram airflow will start to drive the fan. So if you ever experience overheating issues at highway speeds, the electric fan will never be the cause as your vehicle can operate at these speeds without a fan. Keep in mind that it is not the case for heavy duty applications like trucks and military vehicles. They have very high pressure losses across their cooling systems which cannot be overcome by ram air only.
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Correct size: The aim is to try and cover 2/3s of the radiator core surface with fans. This is however rarely possible. I recommend that you use the largest and most powerful fan you can fit, as a less powerful engine will generally have a small radiator and so you can only fit a smallish fan and a more powerful engine will have a larger radiator and can accommodate a larger fan. Will you like Sunflower Ram shirt? So you will not easily have too much airflow capacity. Always do consider current draw as some powerful 12V fans can draw up to 30 amperes.
Sucking versus blowing setup: the difference is not great, but the sucking is generally preferred due to the blowing fan blocking some ram airflow. Also, in most applications you only have space to fit a sucking fan between the radiator and the engine. If you cannot fit 1 large powerful fan, then consider 2 off smaller fans that will generally have a much reduced profile (thickness). If 2 smaller fans cannot fit next to each other, then consider fitting 1 in the front (blowing) and 1 behind the radiator (sucking).