How many CFM do I need to run a fan?
Manufacturers rate fans by CFM. CFM stands for cubic feet per minute so an electrical fan with a 1,500 CFM rating will push 1,500 cubic feet of air per minute. Follow this general guideline: 1,250 cfm for a 4-cylinder
What does 500 CFM mean on a fan?
CFM stands for cubic feet per minute so an electrical fan with a 1,500 CFM rating will push 1,500 cubic feet of air per minute. Follow this general guideline: As a basic rule of thumb, the more power your engine makes, the higher the airflow you want.
What is the CFM rating of an electrical fan?
Manufacturers rate fans by CFM. CFM stands for cubic feet per minute so an electrical fan with a 1,500 CFM rating will push 1,500 cubic feet of air per minute. Follow this general guideline:
How many CFM does a 4 barrel engine produce?
Crash 33, an 1100 cfm 4 barrel will flow 8800 cfm if you use the same logic that a weber engine will flow 2640. Each cylinder can pull about 330 cfm through a weber and the same engine with an 1100 cfm carb will give a max of 1100 cfm to EACH barrel.
How much CFM do I need for a v6 engine?
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.
How many CFM is a v8?
2,500 cfmCFM RatingEngine SizeMinimum Fan CFM4 cylinder1,250 cfm6 cylinder2,000 cfmSmall 8 cylinder (under 302 c.i.d.)2,500 cfmLarge 8 cylinder (302 c.i.d. +)2,800 cfm +May 6, 2017
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.
Which is better pusher or puller fan?
Puller fans provide more cooling capacity than pusher fans. The determining factor on whether to use a puller fan or a pusher fan is the amount of room you have. Always choose a puller fan but if space is an issue then use a pusher fan.
What CFM do I need for 350?
Answer #1: 350 – 400 CFM per ton of HVAC capacity. This answer of 350-400 cubic feet per minute for each 12,000 BTUs of AC cooling is optimal for the system to run efficiently while adequately cooling and dehumidifying the space. Residential systems range from 1.5 to 5.0 tons, or 18,000 to 60,000 BTUs.
How much CFM do I need for car radiator?
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 many CFM is a 20 inch fan?
For a 20″ box fan, the CFM can range from around 1000 CFM up to 2500 CFM.
How much horsepower does a cooling fan use?
In a normal pickup situation, even in high ambient temperatures, the electric fan system will only draw a maximum of about 5 horsepower from the engine.
How do you calculate CFM for a radiator fan?
CFM = (fpm * area), where fpm is the feet per minute. To find the cubic feet per minute, substitute the FPM value with the area after the area is squared.
Should fans be in front or behind radiator?
it will get hot and ideally it would be placed at the top of the system - where the fan is. intakes at front and rear will exhaust through the top radiator. heat rises naturally and this would take advantage of that.
Do pusher fans need a shroud?
Flapper Valves / Shrouds If a pusher fan is the only fan used, cover as much of the radiator core as possible. Remember, shrouds cannot be used on pushers. Fan shrouds need a way to mount to the radiator.
Do you need a shroud with an electric fan?
All shrouded fans should be on the engine side of the radiator. 3. Always use the right shroud with your fan. 4.
How does a mechanical fan affect engine efficiency?
Mechanical fans also rob your engine of horsepower and fuel economy since they are driven off the crankshaft. They simply can’t compete with electrical fans when it comes to efficiency. A radiator only works if there is airflow through the radiator core. An electrical fan provides constant airflow even when the engine is idling, ...
How much air does a fan push?
CFM stands for cubic feet per minute so an electrical fan with a 1,500 CFM rating will push 1,500 cubic feet of air per minute . Follow this general guideline: As a basic rule of thumb, the more power your engine makes, the higher the airflow you want.
How to get air through radiator core?
To get maximum airflow through your radiator core, you should use a fan shroud. A fan shroud ensures that air is moving through the radiator core and not around it. A radiator is useless without airflow, a fan shroud helps direct air through the core. Make sure you use one in your vehicle.
Why is it important to keep your engine cool?
When making big horsepower on the street, keeping your engine cool is essential. Sitting in heavy traffic with a high horsepower engine, a mechanical fan just won’t cut it. Mechanical fans rely on engine rpm and when sitting at idle, they just don’t spin fast enough to keep your engine cool. Mechanical fans also rob your engine ...
What is the difference between curved and straight fan blades?
Straight and curved fan blades come down to a difference in noise versus airflow. Straight blades move more air but are noisy. On the other hand curved blades are quieter but don’t move as much air so it all depends on your application.
How does a fan draw air?
The more current a fan draws, the more airflow it will have. A more powerful electrical fan can draw air through multi row radiators and air conditioning cores. Make sure to get a high performance electric motor that is sealed and prevents contamination from dirt and water. This ensures worry-free performance for years to come.
Do you need a single fan?
Most of the time a single fan is all you need but if you have added a much larger engine or are making big horsepower, then you may want dual fans to maximize the amount of airflow. If you’re not having a problem with overheating, then a single fan will suffice but if you have made significant upgrades such as a turbo or supercharger then dual fans will help provide the additional airflow needed.
How many CFm for hot rod?
We've had quite a few people question our advice when we recommend a 2,500, 2,800 or even 3,000 cfm electric fan for their hot rod or 4x4. They often tell us that they have a 2,500 cfm fan now and their vehicle overheats in low speeds or when they are stuck in traffic. A little more investigative work usually uncovers that what they have now is a basket fan, which leads us to this question: Did you know that 2,500 cfm doesn't always equal 2,500 cfm?
How much air does a Black Magic S blade move?
The #160 moves 3,000 cfm of air the #180 is rated at 3,300 cfm, and both use a 15-inch blade. The cooling advantage of the Black Magic design is a rectangular shroud that covers more of the radiator surface and having the electric motor mounted farther from the surface to reduce an air eddy affect.
How tall is a Loboy fan?
And it is only 1.25 inches tall at the shroud. It's a great fan for tight clearances, but it will not work well as the primary cooling fan for your 1939 Ford with a 500-horsepower engine.
How much of the radiator should be covered with a fan shroud?
Even though the airflow rating is the same, it's spread out over a much larger surface area of the radiator. It's ideal to cover at least 70 percent of the radiator surface with the fan shroud. from ->.
What is a fully shrouded fan?
A fully shrouded fan covers more radiator core surface than a simple basket fan. A basket fan will move air that looks like a doughnut; only moving air in a tight circle around the fan blades, and there will be a hole in the middle of the airflow blocked by the fan motor.
How many CFM can a mechnical fan pull?
A mechnical fan with a good shroud can pull 4 or 5000 CFM easy.
Why is my car overheating on the freeway?
And the general belief is that if you are over heating on the freeway its problably due to a radiator that has to small of coolant capacity or restrictive air flow in the engine bay. If both these things are true than one could not go wrong with installing a good electric fan since they move more air at slow speeds and lack ...
Why use an aggressive fan with a clutch?
An aggressive fan with a clutch is the MOST EFFECTIVE option for a vehicle that is overheating due to air flow issues, or even a vehicle where a cooling system is "marginal" for other reasons.
Why does the engine compartment evacuate?
The low pressure under the car causes the engine compartment to evacuate and a fan becomes secondary to hydrodynamic principle. Plain and simple, you can't move more air through a radiator core than spae between the fins and the density of air will allow. You exceed this at road speed.
Is a mechanical fan more powerful than an electric fan?
Member Emeritus. Mechanical fans are more powerful than electric by a substantial amount...if inadequate, engine will easily swing a bigger one or one with more agressive blades, and a shroud will improve idle performance of any fan setup. Fan is not needed in general when car is moving at any normal speed. If you have room, look ...
Does a 454 3/4 ton truck have a mechanical fan?
Point of reference my 454 3/4 ton truck uses a mechanical fan. I can (and have) put 10,000 pounds of trailer on it plus another thousand in the bed and run it straight up a mountain and never touch 200 degrees. Stock radiator. Stock fan. This is one reason I find it hard to believe that a mechanical fan won't keep a 75 horse flatty cool. Power is heat and you ain't making much power.
Can a 7 blade fan pull air?
I am assuming that you are having cooling issues, IMO If you have room run a machanical. A 7 blade fan with a clutch will pull a lot of air... if you can make one fit it will work better than any electric, and won't WASTE much engine power..
Can you reverse a truck fan?
You probably cannot do better than an old police or truck fan, of course avoiding any serpentine types that are for reverse rotation.
Does the LT1 9C1 have a mechanical fan?
That LT1 9C1 (cop option) fan info is not entirely correct. Reading it one might think the electric fans are insufficient, and that's not the case at all. The cars with mechanical fans are rare as hen's teeth, it's an optional severe duty cooling system that ended up being reassurance more than anything. Fleet mechanics and police buyers were very leery of electric fans in that timeframe. Having used an LT1 9C1 as a beater for 60K, that cooling system is absolutely top notch, no need for a mechanical fan at all. But I'd still put a mechanical fan on the old flattie we're talking about.
How much power can a 4.3L make?
So how much power can you make with a 4.3L. About 250hp with the vortec heads, a good cam and the the above recommended modifications. With a supercharger too its about 320hp.
Which is better, a Vortec 4.3L or a TBI?
Specs on Stock TBI cam is .050″ tappet lift (intake/exhaust) is 179/194; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is .350/.384. The Vortec 4.3L came with a better camshaft in the 201/207 duration range so just another reason that Vortec 4.3L is better, making 45hp more than the 150hp TBI 4.3L. 15hp gained from its better cam and 30hp from its better heads.
When did GM run out of valve covers?
GM ran out of valve covers in 1993 and put vortec 4.3L valve covers on both engines. CAMS are expensive and on a TBI 4.3L is only going to gain you about 15hp from 3000-5500 and lose that much below 2500 rpms. So START with a vortec 4.3L and run TBI on it. 1. The cam in the TBI engine is just plain AWFUL.
Can you use a 4.3L exhaust with a V8?
The exhaust on the 4.3L was designed to be used with the V8’s as well so it will primarily flow fine for anything your going to do with the 4.3L so I don’t recommend messing with the exhaust at all.
How many rpms does an electric fan have?
mechanical fans are usually rated at actual flow as installed, and are rated at 1800 rpms. Comparing an 18" electric fan that says 3600 cfm to an 18" flex fan that is rated at 3200 cfm is no contest. The flex fan will move 4-5 times as much air ...
How many amps does a black magic fan pull?
And those fans pull serious amps. They really tax the charging system. 20 or 25 amps is not uncommon.#N#the black magic fan pulls 17 amp, I believe.
Do electric fans flow half of what they are rated for?
Electric fans are rated at free-flow, so once installed they might only flow half of what they're rated.
How many CFm does a 4 barrel crash 33 have?
Crash 33, an 1100 cfm 4 barrel will flow 8800 cfm if you use the same logic that a weber engine will flow 2640. Each cylinder can pull about 330 cfm through a weber and the same engine with an 1100 cfm carb will give a max of 1100 cfm to EACH barrel.
Why is DCOE better than choke?
Because the DCOE flows better with a choke installed of a reasonable size relative to the throat size. The DCOEs were designed to work with a choke which is more than just minimally smaller than the throat bore - it is important to accelerate the intake flow to create low pressure for proper and complete atomization.
How many CFM does a Weber 48 IDA have?
The Webers are only providing air to one cylinder, where a four barrel carb like Nascar provides 1100 CFM's to any cylinder that's asking for it, not 1100/8. At 330 CFM total from a Weber 48 IDA, I'll run out of air somewhere north of 500 HP.
Can a 48mm downdraft run out of flow?
fosterest, if you're building a V8, I can't imagine that four 48mm downdraft IDAs or four sidedraft DCOE will run out of flow, even if your target hp is over 600. Lots of guys here are using the 40mm IDAs/IDFs on engines with 400-500hp.
How does a clutch fan work?
Clutch fans are controlled by a thermostat and utilize a clutch to engage or disengage the fan at a specified engine speed or temperature. However, the fan’s clutch never fully disengages—it keeps spinning at about 30 percent of the water pump speed at all times. The clutch also limits how fast the fan can spin and only turns ...
Why are mechanical fans bad?
Mainly, mechanical fans cause parasitic horsepower loss because your engine expends a certain amount of power spinning your fan. This translates into power loss at the rear wheels. That’s why electric fans are typically the number one choice for more highly modified vehicles.
What is consistent cooling?
Consistent cooling—they maintain their airflow at all times. Reduced water pump wear. Versatility—they can be mounted in front of or behind the radiator. Multiple sizes and configurations—they can be found in diameters up to 20 inches and are available with single- and dual-fan setups.
Do flex fans use a clutch?
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.
