Radiator Cooling Fan Amp Draw

Size of electric cooling fan(south). Amp depict? airflow? #1395051 02/28/13 02:51 PM 02/28/thirteen 02:51 PM
Joined: Jan 2003 Posts: 7,465 Albany, NY 67SATisfaction OP The member whose name is actually Art
OP The member whose proper name is actually Fine art Joined: Jan 2003 Posts: 7,465 Albany, NY	Guys, Basic question is: Is there a method to sizing your electric radiator fans if you demand additional or acceptable cooling? I have a 335hp non-Mopar that overheats when it's driven much below forty-50mph and the outside temps are about 80F. It's got two shrouded electric cooling fans on its radiator, with thermal switches that kicking ane on offset, so the other as the coolant temp rises. The airflow I feel coming off the non-OEM fans isn't what I remember of equally "aggressive" - the airflow hardly pushes my outstretched hand back. I retrieve my former auto with electric fan had a heck of a push. So I recall the answer lies in installing more than powerful fans. I call back I could measure the bore and the ampere draw on my existing fans (permit'southward say 12" fan, 5amp draw) and compare that to catalog offerings (12" fan/ 9amp draw and check the wiring gauge) to get more catamenia... What're your opinions? Thanks, -Fine art BTW - The simply thing in the cooling system we haven't tried is borescoping the cake to check for casting restrictions. Everything else we can think of about the cooling system has been scrutinized: radiator was bench tested, meets OEM spec, hoses are clear and not collapsing (the prob is merely at depression speed), proper bleeding, coolant fluid, added water-wetter, h2o pump flow all cheque out OK. Last edited by 67SATisfaction; 02/28/13 02:57 PM. 1965 Satellite hardtop 361/2bbl, console 727, open 2.76 1967 Satellite convert 383/4bbl, column 727, open 3.23 1975 Maserati Bora, US spec 4.9L DOHC hemi V8, five-spd ZF man 1977 Maserati Khamsin, Euro spec 4.9L DOHC hemi V8, five-spd ZF human 1982 Alfa Romeo GTV6, 2.5L SOHC hemi V6, 5-spd human being transaxle 2007 Aston Martin DB9, 6.0L DOHC V12, 6spd man transaxle

Re: Size of electrical cooling fan(southward). Amp draw? airflow? [Re: 67SATisfaction] #1395052 02/28/xiii 03:22 PM 02/28/xiii 03:22 PM
Senior Management Joined: Jan 2003 Posts: 27,896 Irving, TX	You have 5 amp and nine amp fans on that car? Cheque again. Amperage describe determines to work an electric motor is doing. You desire something closer to 30 amp depict to cool an old machine. Nosotros are brothers and sisters doing time on the planet for better or worse. I'll take the ameliorate, if you lot don't heed. - Stu Harmon

Re: Size of electric cooling fan(s). Amp depict? airflow? [Re: feets] #1395053 02/28/13 04:24 PM 02/28/13 04:24 PM
Joined: Jul 2007 Posts: ane,526 Due north Carolina cjskotni pro stock
pro stock Joined: Jul 2007 Posts: one,526 North Carolina	CFM determine how much airflow the fans volition push. You will want something in the 2500 and up range depending on your needs...probably closer to the 3000 CFM range. I take a BeCool 2760 CFM dual 11" fan on my radiator with a 20 amp describe (measured) and it keeps my large cake stroker at 185-190 degrees at stand up all the same on a cool solar day. This is on the depression finish of the manufactory temp gauges. I don't think that everyone needs to these monster 30-forty+ amp fans...in many cases that can be a 'BandAid' for a deficient cooling system or other engine issue. Lots of things tin cause overheating too not enough airflow. Non to say it's a bad thought to have extra cooling...just may not be necessary. Also say bye to the a factory alternator with a 30 amp+ draw. However if the motor is running absurd when moving simply the infinitesimal you slow downwards, we accept overheating then information technology could exist an airflow event. I would look at the CFM ratings on the fans and compare to what I said above. Fan shrouds that fit tightly over the radiator also make a huge deviation to make sure all the airflow is 'funneled' through the radiator. And yep, in that location is a huge difference betwixt the quality of the $50 cheapo fans and the more expensive units. I would expect to pay $250-$300+ for a quality fan/shroud setup (minus the wiring/relays/etc.) Skillful Luck!

Re: Size of electric cooling fan(s). Amp draw? airflow? [Re: 67SATisfaction] #1395054 02/28/13 06:56 PM 02/28/13 06:56 PM
Joined: Feb 2003 Posts: 8,430 Andrewh chief
master Joined: February 2003 Posts: 8,430	yous don't need to spend 200 bucks on a fan, but you can not use the aftermarket fans for this. I take tried literally half a dozen of them over the years and none of them pulled plenty air. there are iii or 4 known good oem ones yous can get from junkyards or new for less than 200 bucks. and of course the monster mercedes fan if you really need it. 90'due south maxima'south take the split 2 fan setup. it works, are adequately inexpensive at the yards. HHR fans have been known to work well, and as I recall tin can be had new for under 100 bucks. T-bird fans and something similar are known to work well I call back information technology is the concourse or something like that ford that is supposed to have a simlar fan. and of course again the mercedes fan.

Re: Size of electric cooling fan(southward). Amp describe? airflow? [Re: cjskotni] #1395055 02/28/xiii 07:23 PM 02/28/thirteen 07:23 PM
Joined: Jan 2003 Posts: 7,465 Albany, NY 67SATisfaction OP The member whose name is really Art
OP The fellow member whose proper noun is actually Art Joined: Jan 2003 Posts: vii,465 Albany, NY	Thanks all, that's bully information I tin employ to get started. Feets - Those amps I gave were but guessing to illustrate an case. I haven't nevertheless measured the draw on my existing fans, but I will now so I know where things stand. cjskotni - Thanks, that's excellent "sample" data. I'll check the alternator capacity and work information technology into the solution. Thanks once again guys! -Fine art Edit: Of course, now I see the Monster Cooling Fan thread you posted Feets, I'll get read that now... Last edited by 67SATisfaction; 02/28/thirteen 07:34 PM. 1965 Satellite hardtop 361/2bbl, console 727, open ii.76 1967 Satellite convert 383/4bbl, cavalcade 727, open up 3.23 1975 Maserati Bora, US spec iv.9L DOHC hemi V8, v-spd ZF human being 1977 Maserati Khamsin, Euro spec four.9L DOHC hemi V8, 5-spd ZF man 1982 Alfa Romeo GTV6, 2.5L SOHC hemi V6, 5-spd homo transaxle 2007 Aston Martin DB9, vi.0L DOHC V12, 6spd homo transaxle

Re: Size of electrical cooling fan(s). Amp draw? airflow? [Re: 67SATisfaction] #1395056 02/28/13 09:07 PM 02/28/thirteen 09:07 PM
Joined: November 2006 Posts: 1,408 oklahoma forphorty pro stock
pro stock Joined: Nov 2006 Posts: i,408 oklahoma	I have an HHR fan on my duster. It works very well , but information technology's simply a stock 318. Other members on hither have used it with larger engines and have been very pleased as well. I got mine from Rockauto for $60.

Re: Size of electric cooling fan(s). Amp draw? airflow? [Re: forphorty] #1395057 02/28/xiii 09:46 PM 02/28/13 09:46 PM
Joined: October 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
Also Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	the HHR is nice if you want a "slap it on, plug it in" fan. it comes with it's own shroud. but I don't like the HHR fan. I like the Jeep Thousand Cherokee fan. it's nineteen" diameter, pulls a metric crap ton of air, and tin can be had brand new for nigh $50 from the mopar dealership. but problem with the fan, is that it'south got a taper on both sides of the fan, so you'll have to fabricate your own mount to make it work, you lot can't just slap it up confronting the radiator. OEM fans are the way to get. they're built to run 100k miles or more than, and are mass produced plenty that the cost is cheap compared to an aftermarket fan that toll twice as much, pulls one-half the amps, moves 1/iv of the air, and blows upwards in 15k miles.

Re: Size of electric cooling fan(s). Amp describe? airflow? [Re: RobX4406] #1395059 02/28/13 11:52 PM 02/28/xiii 11:52 PM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
Likewise Many Posts Joined: October 2003 Posts: 21,345 Marysville, O-H-I-O	uh....the year with the call back for the E-fan? Let me search for it...

Re: Size of electric cooling fan(south). Amp draw? airflow? [Re: 70Cuda383] #1395060 02/28/13 11:57 PM 02/28/xiii eleven:57 PM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	Looks like an early 2000s 4.7L K Cherokee. Rock Auto had one for an 01, 4.7L GC. but they want $177 for it. I got mine from the dealer for $50 back in nearly 05 or 06

Re: Size of electric cooling fan(s). Amp depict? airflow? [Re: 70Cuda383] #1395061 03/01/13 01:26 AM 03/01/thirteen 01:26 AM
Joined: Jan 2003 Posts: eight,739 poplar bluff mo. toplescuda I Whine
I Whine Joined: Jan 2003 Posts: 8,739 poplar bluff mo.	Just a idea i have 2 10" fans on a 3row champion rad. for the hemi in the challenger i used ii differnt sencers to have fans come on commencement one would not kicking them on till over 210� the other was 195�that was in tested on stove in.water i wired them and so come up on with the primal the hemi ran for tour 10-xv min idle temp would not get over 165� then i had to disengage one of them is information technology possible that its not coming on before long enuff and the low speed just not enuff air motility? 1970 barracuda convert. ane of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline cherry 2014 quad cab 4x4 ram 8 speed hemi

Re: Size of electrical cooling fan(due south). Amp draw? airflow? [Re: feets] #1395062 03/01/13 02:thirteen AM 03/01/13 02:xiii AM
Joined: Jan 2003 Posts: 10,765 Fundamental Valley, CA. Quicksilver440 I Live Here
I Live Here Joined: January 2003 Posts: 10,765 Central Valley, CA.	Quote: You accept five amp and nine amp fans on that car? Check once again. Amperage draw determines to piece of work an electrical motor is doing. You desire something closer to 30 amp draw to cool an one-time car. Feets is correct on hither....OEM fans are the simply style to get....I run the famous xc's ford taurus V6 fan....awesome amount of air. Pulls thirty+ amps....over 50 at start up. Google information technology...it is one of the near pop to utilize. HHR is good too, so is Marker Half-dozen fans...

Re: Size of electric cooling fan(s). Amp draw? airflow? [Re: toplescuda] #1395063 03/01/13 02:19 AM 03/01/xiii 02:19 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Is there whatever reason you can't run a factory way fan system? You lot know, proper mechanical fan and shroud, setup with the right spacing. You don't hear of a lot of guys overheating with this setup.

Re: Size of electric cooling fan(s). Amp draw? airflow? [Re: DaytonaTurbo] #1395064 03/01/13 09:30 AM 03/01/13 09:30 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
As well Many Posts Joined: October 2003 Posts: 21,345 Marysville, O-H-I-O	my personal preference, and rationale, is that mechanical fan, although effective...never shuts off. fifty-fifty if the clutch goes to "about idle" on the fan, you're nonetheless spinning it with the engine...all the time...when you don't need it. the squeamish thing well-nigh electric fans, is that y'all CAN become ane that works, and wire them to ONLY work when yous need them. the whole "ma had it right" argument that guys often spout is amusing to me. If there's "no demand to modify anything, the engineers had it right from the manufacturing plant" then why does the same guy who makes that point accept bigger brakes, ported heads, camshaft swaps, stroker cranks, stiffer T-bars, adaptable shocks....

Re: Size of electrical cooling fan(southward). Amp draw? airflow? [Re: cjskotni] #1395065 03/01/13 11:25 AM 03/01/13 11:25 AM
Joined: Jan 2003 Posts: 27,896 Irving, TX feets Senior Direction
Senior Management Joined: Jan 2003 Posts: 27,896 Irving, TX	Quote: CFM decide how much airflow the fans will push. You will want something in the 2500 and up range depending on your needs...probably closer to the 3000 CFM range. This is where you screwed upwardly. There are no regulations when it comes to air menstruation. Cheap fans tin draw a bazillion cfm and not cool your car. You lot encounter, in that location is a MAJOR deviation betwixt drawing 3000 cfm when the fan is powered upwardly in a room with no radiator and a fan drawing 2000 cfm through a radiator. The cfm ratings are written at the manufacturer'due south discretion. If they think it's swell to toss out a huge number to look more powerful than the competition that's what they're going to exercise. I had a very difficult auto to cool and went through a huge pile of fans (far more Andrewh tried) and turned to OEM stuff to observe solutions. The OEMs had to come up with something that would work without fail through worst case scenarios. Utilise their enquiry money to solve your issues. We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon

Re: Size of electric cooling fan(due south). Amp draw? airflow? [Re: 67SATisfaction] #1395066 03/01/13 12:42 PM 03/01/13 12:42 PM
Joined: Jan 2006 Posts: half dozen,710 USA 360view master
master Joined: Jan 2006 Posts: 6,710 USA	zilch beats measuring things yourself like an engineer would you need to buy a small "air current speed meter" and use it to measure the average speed of the air entering your radiator. Kestrel makes extremely good ones, acceptable is the $31 LaCrosse or the $20 Eddie Bauer http://www.amazon.com/La-Crosse-Technolo...osse+air current+speed i have measured myself with the cheap LaCrosse meter and besides an expensive and calibrated coal mining spec Anenometer about 3600 cubic feet per minute of airflow on a 245 HP 360 V8 at idle 570 rpm with an Ac condensor in front of the radiator calculation resistance and the viscous clutch v blade fan unlocked and slipping then that it was turning about 480 rpm when the gluey clutch locks and at higher RPM the cfm of the air moved will roughly double with doubled RPM only the ability consumed by the fan will go upward dramatically ... when the RPM doubles to 960 the fan will use between iv and viii times more than horsepower ( for geeks raise to power of 2.4) every bit you can tell from the wimpy power of these xiii.8 volt DC electric fans, which yous tin estimate by multiplying: volts times amps times 0.8 (efficiency) then divide by 746 to catechumen watts to Us standard Horsepower they tin can not move air in volumes like a mechanical fan because their motors dont have the horsepower somewhere i have a graph of the ability consumption versus RPM of the glutinous clutch fan of a Chrysler 340 V8, which also showed the power consumption of the power steering and alternator. i have posted that graph on Moparts in the past, i think it is in the back of John Heywoods IC Engines book. be aware that the electric fan manufacturers are catchy in their advertizing .. what they call CFM is in costless air with the fan standing lonely, and is non pulling through the resistance of the radiator fins or the air-conditioning condensor, or in some cases additional coolers on the other hand the cooling organisation on factory vehicle setups are style oversized ... most are ready upwards for towing trailers upwards 6 per centum grades in Death Valley national park in 120+ F exterior air temperatures while staying below 240 degrees F coolant temperature i have run a 200 mile long 70 mph highway cruise fuel economy test with no fan blades at all, using special NPG coolant that is only seventy% the oestrus removal capacity of normal fifty/50 ethylene glycol-water coolant, and observed no over heating

Re: Size of electric cooling fan(s). Amp draw? airflow? [Re: DaytonaTurbo] #1395067 03/01/13 01:05 PM 03/01/xiii 01:05 PM
Joined: Jan 2003 Posts: 5,220 And then Cal Sinitro master
master Joined: Jan 2003 Posts: 5,220 And so Cal	Quote: Is there whatever reason you can't run a factory style fan system? You know, proper mechanical fan and shroud, setup with the right spacing. You don't hear of a lot of guys overheating with this setup. Absolutely!! The Mopar OE organisation works well due to its overdesign.. In SoCal on hot days, our 525HP wedge runs fine and cool, rarely goes across 180... Sounds similar the block needs to be flushed out.. If plugged badly one can hang 5 fans on information technology and it will still overheat.. But my $0.02..

Re: Size of electric cooling fan(s). Amp describe? airflow? [Re: 70Cuda383] #1395068 03/01/13 02:41 PM 03/01/13 02:41 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Besides Many Posts
Too Many Posts Joined: February 2003 Posts: 21,318 Manitoba, Canada	Quote: my personal preference, and rationale, is that mechanical fan, although constructive...never shuts off. even if the clutch goes to "nearly idle" on the fan, you lot're nonetheless spinning it with the engine...all the time...when you don't need it. And the trouble with the fan running all the time, even with the fan clutch dragging a piddling is?????? Actress airflow through the engine bay, evacuating out engine heat, helping to cool headers and keep air flowing across the carb does not sound similar a bad idea to me. More consistent under hood temps from constant fan menstruum sounds to me like something a carb is easier made to deal with, rather than fluctuating nether hood temps as an electric fan cycles on/off allowing under hood temps to cycle upward and down. I read a car arts and crafts article on time where they dynoed a sb chevy with a clutch fan vs a stock-still fan vs an electric. If retentivity serves the fixed fan lost 15hp from the electric and the clutch lost near 7 from the electric. Sounds similar a lot of extra money and hassle combined with sub-par cooling in many cases, just to gain a few hp.

Re: Size of electric cooling fan(s). Amp describe? airflow? [Re: forphorty] #1395070 03/01/xiii 05:26 PM 03/01/xiii 05:26 PM
Joined: February 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
Also Many Posts Joined: February 2003 Posts: 21,318 Manitoba, Canada	I've grabbed clutch fans from the junkyard for 15 bucks. Of course you tin can also catch electric fans at that place for the same price. Even if the price is a wash between the two, I don't run across a real benefit to the electrical fan. You still have to claw it up to a temperature switch or mickey mouse it with a toggle switch. Then you get to lookout man your temp needle swing upward and downwards as you lot hear the fan bicycle on and off. That in itself annoys me when I hear the fan on my fwd daily driver kick on/off at idle when the a/c or defrost is on.

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