Wiktor Wise
When it comes to keeping your engine cool, the right electric fan setup is crucial. Upgrading from a mechanical fan to an electric fan is a common modification for Chevy 350 owners, but choosing the right size and type of fan can be a challenge. Factors such as radiator design, shroud use, and airflow characteristics all play a role in determining the optimal fan configuration. In this discussion, we will delve into the considerations and recommendations for selecting the ideal electric fan size for a Chevy 350 engine.
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What You'll Learn
Electric fan upgrade options
Upgrading your radiator to an aluminium model with electric fans is a popular option. This requires some technical know-how, as you will need to understand how to hook up the electric fans and what to do with the clutch fan. One option is to get an idle pulley to hold its place, or you could look into serpentine systems. You may also need to upgrade your water pump from mechanical to electric, and you will need to source shorter water pump pulley bolts.
When it comes to the fan itself, most electric fans will work for any car, so the important thing to know is the size of your radiator. How much room is there between the radiator and the motor? How are you going to mount the fans? If you are going with a two-fan set-up, never go under 11" in diameter. The goal is to cover as much of the radiator core as possible.
You can also purchase a fan with a temperature-sensing bulb, which is adjustable to whatever temperature you want. These are available for around $20.
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CFM requirements for cooling
CFM, or Cubic Feet per Minute, is a measure of airflow and indicates how much air a fan moves. The CFM requirement for cooling a 350 Chevy engine depends on several factors, including the type of fan, the radiator design, and the driving conditions.
For a factory engine, a CFM of around 2000 is recommended. Most aftermarket electric fans fall in the range of 1650-1750 CFM, with some higher-performance options offering CFM in the 2000s. A good fan shroud is also important to ensure the fan pulls air from the radiator cavity rather than the engine bay.
Some owners have reported that a CFM of 3000 is ideal for keeping their 350 Chevy engines cool, especially in heavy traffic. A fan with a CFM of 3000 can help maintain temperatures below 200, even in challenging conditions. However, fans with higher CFM ratings tend to be more expensive.
The radiator design can also impact the CFM requirement. For example, a thicker radiator core or the absence of an AC condenser in front of the radiator can affect airflow and cooling performance. Additionally, the type of fan, whether it is a pusher or puller, can influence the CFM needed. Puller fans are generally preferred, as they are more effective at drawing air through the radiator.
When considering the CFM requirements for cooling a 350 Chevy engine, it is essential to take into account the specific needs of your vehicle, including the engine configuration, radiator design, and typical driving conditions. Consulting with automotive experts or referencing vehicle-specific forums can provide valuable insights into determining the appropriate CFM range for effective cooling.
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Fan placement and direction
When installing an electric fan for a 350 Chevy, there are a few things to consider regarding fan placement and direction. Firstly, the rotation direction of Chevy V8 engines is always clockwise when facing the front of the engine. This is an important consideration when placing the fan to ensure it is installed in the correct direction.
The fan's placement and direction can impact its efficiency. The ""scoop" or "cup" of the blade should dictate its mounting orientation. The fan blades are usually curved and sometimes bent at an angle, designed to provide the best efficiency in pulling air through the radiator. The fan's direction should be such that it pulls air through the radiator, similar to how a swimmer cups their hands to move forward efficiently.
When installing an electric fan, it is also important to consider the placement of the temperature sensor. For a small block 350ci engine, the best location for a screw-in bulb-type sensor is the intake manifold, which mixes the return from both cylinder heads. If using a thermal probe (a wire with a thermistor on the end), it can be placed between an upper radiator hose and its corresponding connection.
Additionally, when upgrading to an electric fan, the clutch fan's placement may need to be addressed. Some options include installing an idle pulley to hold its place or exploring serpentine systems.
Overall, when installing an electric fan for a 350 Chevy, it is crucial to consider the fan's direction, placement, and the proper positioning of associated components, such as temperature sensors, to ensure optimal performance and efficiency.
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Fan shrouds
When it comes to keeping your engine cool, fan shrouds are an essential component. They direct airflow and help regulate engine temperature, ensuring your Chevy's performance and longevity.
For the Chevy 350 engine, there are a variety of fan shrouds available, catering to different model years and specifications. For example, the 1981-1987 Chevrolet Pickup without AC and with a 350 engine is compatible with a specific fan shroud, which is also suitable for some 1981-1991 Chevrolet Blazers and GMC models. This shroud is constructed from high-quality ABS, designed to fit seamlessly into the engine compartment and is priced at $117.99.
Classic Chevy also offers fan shrouds for various models. For instance, they have a reproduction fan shroud manufactured to original factory specifications, which fits Big Block (396/427) engines. It is made from stamped aluminum that can be polished to a high luster and is easy to install. Additionally, they offer a Chevy Fan Shroud for the V8 engine from 1955-1957, also made from stamped aluminum.
Another option is the Upper Fan Shroud for the 81-86 Chevy GMC C/K Squarebody Pickup Truck and the 87-91 R/V Pickup Blazer Jimmy Suburban. This shroud is designed for small block 305/350 engines without air conditioning and is made from high-quality ABS. It is a reproduction of the original shroud and helps maintain the performance and health of the engine by directing airflow and regulating temperature.
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Fan size and vehicle compatibility
When it comes to electric fans for vehicles, size and compatibility are crucial factors to consider. The size of the electric fan plays a significant role in its cooling capacity and efficiency. A larger fan can move more air and provide more effective cooling, especially in high-performance or high-temperature situations. On the other hand, a smaller fan may be more compact and suitable for vehicles with limited space in the engine bay.
For a 350 Chevy small block Gen I engine, electric fans with diameters ranging from 12 to 16 inches are available. For instance, Summit Racing offers a range of electric fans compatible with Chevrolet and GMC vehicles, including dual 14-inch fans with a total airflow of 2,600 cubic feet per minute (CFM) and single 14-inch reversible fans with 1,250 CFM. These fans are designed to fit specific Chevrolet and GMC models, ensuring optimal cooling performance.
When upgrading to an electric fan or choosing a replacement, it is essential to consider the vehicle's make, model, and engine specifications. Electric fans can vary in size, shape, and mounting configuration, so ensuring compatibility with the available space and mounting points in the vehicle's engine bay is crucial. In some cases, modifications may be necessary, such as upgrading the radiator or making adjustments to the water pump and pulley system.
To ensure proper installation and functionality, it is recommended to refer to the vehicle's manual or seek advice from experienced mechanics or enthusiasts. Online forums and communities can also provide valuable insights and guidance on choosing the right electric fan size and ensuring compatibility with specific vehicle models.
Additionally, electric fan wiring kits and senders play a vital role in the overall performance and compatibility of the cooling system. These kits provide the necessary wiring harnesses, relays, switches, and connectors for a seamless installation. They also help regulate the fan's operation based on temperature, preventing overheating and optimising engine cooling. When selecting a wiring kit, it is essential to consider factors such as wire gauge, relay capacity, and sensor compatibility to ensure compatibility and meet the specific requirements of the vehicle's cooling system.
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Frequently asked questions
The size of the electric fan you need for a 350 Chevy depends on your engine and setup. For a factory engine, a 1600-2000 cfm fan should be sufficient. If you have a more powerful engine, you may need a fan with a higher cfm rating, such as the Black Magic fan or the Lincoln Mark VIII fan, which has a rating of 4000-5000 cfm.
Some recommended electric fans for a 350 Chevy include the Spal Dual unit, the Corvette fan, the Mark 8 fan, and the Taurus fan.
When choosing an electric fan for a 350 Chevy, it is important to consider the cfm rating, the size of the fan, and the quality of the fan shroud. A fan shroud helps direct airflow and improves the efficiency of the fan. Additionally, the complexity of the wiring and relays may be a factor, especially for dual or dual-speed fans.
