How many CFM does a flex fan pull?

Take a look at the Flex-a-lite dual 15″ electric fan for your rig. I think it would fit and pulls like 5000 cfm. Not real scientific but you can hold your hand out behind the fan and kind of develop a feel for the amount of air moving along with the speed/force at different rpms.

Determine Optimum Airflow 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.

Secondly, are Flex a lite fans good? If you have a four-core radiator with an inner cooler, air conditioning condenser and transmission cooler stacked in front, a 7-blade flex fan along with a proper-fitting fan shroud will be a great choice for cooling. A belt-driven fan is also a good choice if you are having a cooling problem at higher engine rpm.

In this way, how does a flex fan work?

A flex fan always pulls air at low rpms and disengages (flattens out) and pulls less air at high rpms whether even if the engine is running hot such as may happen if you downshift to climb a steep long grade on the highway. fans that are rivited together (aftermarket metal flex fans) like to come apart at high RPM.

How do you calculate CFM for a radiator fan?

The easiest formula I use is speed X area. I measure the air speed either through the radiator if I can or an average through the grille. 9 readings in a grid like fashion are minimum. With that average speed in feet/ minute or FPM; multiply it by the area of the radiator core in square feet.

How much horsepower does a electric fan add?

1/2 horsepower

What’s 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.

What is the best electric radiator fan?

#1. Upgr8 12V Cooling Radiator Fan. The Upgr8 12V Cooling Radiator Fan is the best electric radiator fan because it is ultra thin and lightweight. #2. Autosaver 16″ Electric Radiator Cooling Fan. #3. Auto Dynasty Electric Radiator Cooling Fan. #4. A-Team Performance Radiator Electric Fan.

How far should a fan be from the radiator?

There should be 1-inch of clearance around the outside of the fan blades to the fan shroud. The last measurement you should check is the distance from the face of the fan to the radiator. There should be at least 1 inch of clearance between the two.

Can SPAL fans be reversed?

Reversing Direction The technicians at Spal tell us their fan motors are optimized to operate in one direction or the other. By reversing the wires so what was positive is now negative, and vice versa the motor will spin the opposite direction, but it will run slower.

Is a flex fan better than a clutch fan?

Flex fans don’t use a clutch and therefore operate at 100 percent of water pump speed, making them more efficient than clutch fans. Considered a step up from clutch fans, these fans are typically lighter than clutch fans and often feature blades that flatten out at higher rpms for greater efficiency.

Do I need a clutch fan?

According to Hayden, here are some signs your fan clutch might need replaced: Fan spins excessively when engine is stopped (three or more times when hot engine is shut off). Poor A/C performance at idle or low vehicle speeds. Fan speed does not increase when engine is hot.

What is the function of viscous fan?

Viscous fan couplings are used on vehicles (cars and trucks) with inline engine positions, mainly rear wheel drives. These fans are needed at slow speeds and while idling. A faulty fan can cause an engine to overheat while idling or in heavy traffic, or poor mileage and loss of horse power.

What is an e fan?

The electric fan was one of the most important electric inventions of all time. The fan is a building block of other more advanced technologies. It would be hard to imagine a world without the electric fan! The electric fan has blades similar to a water or steam turbine. A DC or AC motor drives a rotating shaft.

How many amps does an automotive electric fan draw?

Twelve- to 16-inch fans can draw from 15 to 28 amps, while some dual fan applications can draw up to 35 amps. Make sure your electrical system can handle the addition of an electric fan.