Quick Answer

What is the highest CFM radiator fan?

Super Duty Motor – Be Cool has the answer when you need the maximum airflow possible from a single 16” electric fan. The Super Duty motor produces 3,140 cubic feet of airflow per minute (cfm) when mounted against a radiator core. This is the highest-rated CFM available from a through-the-radiator-core 16” electric fan.

How many CFM is a radiator fan?

As a general rule of thumb, follow these minimum cubic feet per minute (cfm) ratings when using an electric fan as the primary cooling source on a basic engine: 1,250 cfm for a 4-cylinder. 2,000 cfm for a 6-cylinder. 2,500 cfm for a 8-cylinder.

How many CFM do I need to cool a radiator?

Find a Normal Airflow According to the conventional rule of thumb, use an electric fan as your primary cooling source when cooling any model engine below 1,250 rpm: This is where a 4-cylinder engine should rank. With a six-cylinder, power capacity is 2,000 cfm. For an 8 cylinder, 2,500 cfm will be needed.

How many CFM do I need to cool a v8?

How Many Cfm Do I Need To Cool A V8?

Engine Size Minimum Fan CFM
4 cylinder 1,250 cfm
6 cylinder 2,000 cfm
Small 8 cylinder (under 302 c.i.d.) 2,500 cfm
Large 8 cylinder (302 c.i.d. +) 2,800 cfm +

Is it better to push or pull air through a radiator?

A Push configuration is more efficient in cooling when its blowing cool(er) air from outside the plenum through a radiator. A Push also makes your build louder. In Pull configuration the fan or fans are drawing an air stream out of the radiator.

Who makes the thinnest electric fan?

Fluidyne Ultra-Thin Line electric fans are a great accessory for your cooling system. These 10-blade 12 V fans are available in pusher and puller models to suit your cooling needs.

How many CFM is a v8?

CFM Rating

Engine Size Minimum Fan CFM
4 cylinder 1,250 cfm
6 cylinder 2,000 cfm
Small 8 cylinder (under 302 c.i.d.) 2,500 cfm
Large 8 cylinder (302 c.i.d. +) 2,800 cfm +

How much clearance do you need between radiator and fan?

The fan is designed to create negative pressure behind the radiator to pull air through. But the farther away the fan is from the radiator, the less effective it becomes. Flex-A-lite recommends that the fan blades be within 1 inch of the radiator and no more than 2 inches away.

Which is better pusher or puller fan?

Pullers are about 20% more efficient than pushers. A puller draws the air in at any angle and around obstacles like a vacuum, pulling the hot air from the radiator at a constant CFM. With a pusher the air is pushed towards the radiator and this causes some bounce where it loses 20% of it’s flow.

How many CFM do I need for 500hp?

Most street car applications need about 2,000 cfm for a 400-500 hp engine with air conditioning and trucks pulling trailers need 3,000 to 4,000 cfm depending on the engine and road conditions.

How do I choose a cooling fan?

Fan Selection Procedure

Determine the amount of heat generated internally by the machinery. Calculate the air flow required once you have determined the heat generation, the number of degrees the temperature must be lowered and what the ambient temperature should be. Select a fan using the required air flow.

How do I know what size electric fan I need?

Measure the length of one blade from tip to base. Be sure to measure from just above the blade root, as shown, OR from where the blade meets the hub in an assembled fan. Multiply the blade length by two and add that measurement to the hub diameter from step 3 to determine your total fan diameter.

Do electric fans increase horsepower?

We’ll jump right into the heart of the matter: An electric fan is the better performance solution, freeing up maximum horsepower and mpg.

How can I improve my engine cooling?

Three Easy Ways To Improve Engine Cooling

  1. Increase flow through the cooling system.
  2. Increase the cooling capacity of the radiators.
  3. Increase the pressure of the cooling system.

How much CFM do I need for my engine?

The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456. Any ordinary stock engine will have a volumetric efficiency of about 80%.

Do I need fans on both sides of radiator?

Using fans on both sides of the radiator is fine but if your radiator is cooling as well as it possibly can with fans on only one side, doubling your fan count is only going to cost more money and make the whole setup louder. Heat rises by convection. It’s a force of nature, but it’s a very weak force.

Do fans go in front or behind radiator?

Generally, you want the case fans in front of the case drawing in air while the fans at the rear blow air out. If your case has vents at the top, they should be placed as exhaust fans because hot air will rise. Side-mounted fans should be used for intake, though they often don’t have air filters.

Does a thicker radiator cool better?

Thicker is better, but also requires more case space and better fans. Getting a thicker radiator won’t largely affect your temperatures but it will affect how much heat you can actually dissipate (mostly translates to higher overclocks rather than more components). Also keep in mind heat dissipation isn’t linear.

How many amps do Mishimoto fans draw?


Type of Ends Female Snap-Plug Terminal
Normal Current (amps) 7.6
Volts 12
Housing Diameter 12.5
Blade Diameter 280

Are Mishimoto fans reversible?

Reversible. These fans can be easily wired and installed as a pusher or a puller depending on what your build needs.

Does radiator fan cool engine or radiator?

Functions of radiator cooling fan

The primary function of a radiator cooling fan is to take away excessive heat absorbed from the engine. The coolant absorbs the heat and goes into the radiator where the heat is blown away. The system is functional when the engine is stationary, where air can’t move through the grille.

How far should radiator fan be in shroud?

The fan ideally should fit one half of the pitch depth of the blade into the shroud opening. If it is too far rearward out of the shroud air will be pulled from around the blade tips. Being too deep into the shroud can cause turbulence affecting airflow and cooling ability.

Does a radiator fan need a shroud?

If you rely on a belt-driven fan for engine cooling, a fan shroud is a must to pull the air through the radiator. Without a shroud, air will take the path of least resistance, pulling air from over and under the radiator instead of through it.

Can you run a pusher and puller fan together?

Can You Run a Pusher and Puller Fan? Yes, you can technically run a pusher and puller fan in conjunction. When would you? In the example above, the 1946 Ford has a narrow opening between the fenders which requires the use of a very narrow radiator and doesn’t leave room for a fan shroud.