Clutch fan vs derale single 2400cfm fan

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MoparMark91

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Question guys I know this has been covered in other posts but want to see what u guys think.

So in front of me I have a Hayden clutch with a 18" fan. I do have a plastic Mopar shroud but doesn't seal the best.

I also have in front of me is this derale setup with wiring and relay and better alternator. I'll attach screen shot


I currently am running a flex fan that I want to do away with. The choice is mine since both in front of me but the problem I am currently having with the flex fan is once driving around totally fine except really hot days it does climb temp. When I idle in traffic it will go from 180 to 200 in about 4 minutes or so. I'll attached my current setup picture from when I measured before work

I bought a knock off champion radiator off eBay awhile back to replace my champion radiator that my flex fan destroyed during engine break in. Fan literally exploded.

I bought a cold case 2 row 1.25 tube size and want to pair it with best cooling option of the two and want to do away with my flex fan.

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I'd try the Derale if you have the room and a good alternator that can handle the load. Make sure to use a good relay. Can always fall back to the clutch fan if you have room. Derale & Spal are great fans typically.
 
My vote is clutch fan. 180 to 200 is no issue UNLESS it continues to rise.

Clutch fan will not cause other issues. Plus you can find other fans with other diameters and pitched and blades if you don't like the results.

The electric fans shroud is guaranteed to give you issues at speed.

Measure the area of the hole vs the area of your core, you are blocking 30 to 50 percent of the airflow through your radiator.

Plus the flat aluminum an inch or two behind the core creates a standing pressure area that will prevent air from entering the radiator.
 
That electric fan is no match to what a mechanical clutch fan can produce as far as CFM required. Under all circumstances I will always use a mechanical clutch fan if I can.
 
2400 ain't enough. Needs to be close to twice that as a minimum for any type of performance build.
 
Thanks guys for the feedback, I am going to return all the electric setup and just go with the Hayden 18 inch clutch fan and make sure my shroud sealed. I just am trying to tackle the issue before summer comes. I appreciate all the help guys I really do
 
What blows me away is even with dual fans you can't get the cfm higher than 2500. I even looked at the HHR fans that people mentioned in past posts but that doesn't put much out either
 
What blows me away is even with dual fans you can't get the cfm higher than 2500. I even looked at the HHR fans that people mentioned in past posts but that doesn't put much out either
There are many electric fans on the market well above 2500CFM. They ain't cheap. I agree with the clutch fan though as long as you have the room.
 
You guys need to search " overheat" !
Every year, - year after year, - always the same .

Some of the most inventive, imaginative, complex/simple, mega$$$, electric fan/shroud systems end up as frisbees across the yard .
 
Converted to mechanical replacing electric that came with when I bought it. 5 blade Hayden clutched with a shroud. Best cooling decision I ever made. Those Chrysler engineers were pretty smart guys.
 
My vote is clutch fan. 180 to 200 is no issue UNLESS it continues to rise.

Clutch fan will not cause other issues. Plus you can find other fans with other diameters and pitched and blades if you don't like the results.

The electric fans shroud is guaranteed to give you issues at speed.

Measure the area of the hole vs the area of your core, you are blocking 30 to 50 percent of the airflow through your radiator.

Plus the flat aluminum an inch or two behind the core creates a standing pressure area that will prevent air from entering the radiator.

Well said on the flat shroud.

Opinion mixed with Sperience

Street : Clutch fan with factory shroud (and an electric pusher out front if heat in traffic is an issue)
Race Only
Round Track: Solid fan, factory or fabricated shroud.
Drag: All electric, no flat shrouds
 
Alright clutch fan it is then I don't have a 5 blade but I have a 7
 
7" will be just fine. I'm running the 7" with clutch, shroud, weather stripping on front and rear underside of the hood on both the Dart and Coronet. Dart has a Cold Case rad, Coronet a Glen Ray. Closed system overflow cans. Basically the stock Ma Mopar setup. Temps don't start climbing until stop-n-go driving in NorCal 100 degree summer heat. Then back on the freeway and temps drop back down. I'm sold on Mopar engineering.
 
Question guys I know this has been covered in other posts but want to see what u guys think.

So in front of me I have a Hayden clutch with a 18" fan. I do have a plastic Mopar shroud but doesn't seal the best.

I also have in front of me is this derale setup with wiring and relay and better alternator. I'll attach screen shot


I currently am running a flex fan that I want to do away with. The choice is mine since both in front of me but the problem I am currently having with the flex fan is once driving around totally fine except really hot days it does climb temp. When I idle in traffic it will go from 180 to 200 in about 4 minutes or so. I'll attached my current setup picture from when I measured before work

I bought a knock off champion radiator off eBay awhile back to replace my champion radiator that my flex fan destroyed during engine break in. Fan literally exploded.

I bought a cold case 2 row 1.25 tube size and want to pair it with best cooling option of the two and want to do away with my flex fan.

View attachment 1715888801

View attachment 1715888803
I see you said you returned it already, but I bought that exact fan years ago.....I recently gave it to my brother in law for free a few months back because it never even came close to what I needed it to do, and I was fairly certain it never made anywhere near advertised cfm.

He just has a stock 318, so I'm sure it'll be fine there, but hp=heat, and I was way beyond that thing even coming close.

Just one more opinion for the sake of the thread.
 
My vote is clutch fan. 180 to 200 is no issue UNLESS it continues to rise.

Clutch fan will not cause other issues. Plus you can find other fans with other diameters and pitched and blades if you don't like the results.

The electric fans shroud is guaranteed to give you issues at speed.

Measure the area of the hole vs the area of your core, you are blocking 30 to 50 percent of the airflow through your radiator.

Plus the flat aluminum an inch or two behind the core creates a standing pressure area that will prevent air from entering the radiator.
I'm gonna disagree on you on this. The Derale fan shroud stands off the radiator at least an inch creating a plenum that will allow the fan to draw air across the entire radiator, unlike the pusher setup right against the radiator, that literally only uses the diameter of the fans footprint over the rad core when standing still. When the fan is running, it is moving air, and air will take the route of least resistance out the fan, that includes ALL the air in the shroud and that air has to be replaced with air across the radiator core. No pressure buildup when he fan is running. Electric fans also regulate temperature better than a mechanical fan as they can be controlled by thermo switches. It does not have to be on when the motor is cold start up, the duals usually have a dual fan controller that will have one running while the other one is only kicked in when the temp goes over a preset value. A mechanical fan never disengages, doesn't work when the motor is turned off (heat soak) and runs full blast at WOT when you probably dont even need it as air across the rad is a given. One guy saw a 3.85% gain in HP and 8.93% gain in Torque going from clutched mechanical to electric. Whats a ~4% gain of HP on your motor? 9% torque gain? Even though the electric fan is causing more drag on the alternator, its still way more efficient than the mechanical fan. I understand some guys wont use them (as noted) but you can't deny the benefits of the electrics over the mechanicals.

Performance Gains with an Electric Fan | 4WAAM
 
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Yeah I wanted to go the electric fan route to optimize HP and torque and cooling efficiency but my main concern is if I want to go for a cruise in middle of day or go on a car cruise I don't want to be the one with heat problems
 
cooling problem on a slow light to light cruise down the Sunset strip? That's when an electric will shine and a mechanical will strain. Ever start to get hot in traffic..yeah, mechanical fan operating at slightly above engine idle speed (either clutched or thermo locked up) with no regulation. electrics will be full on or will cycle whenever they reach the set temperature.
woodwardcruise_50.jpg


I remember cruising Balboa Blvd in the mid 80's light to light traffic for 3 miles and top speed was about 10 mph. Plenty of hot cars pulled over to cool off. Would take about an hour to do the circuit and then the police made it illegal from homeowner pressure. I dont blame them, it was getting pretty bad with many crotch rockets and loud stereo systems.
 
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