Clutch fan vs derale single 2400cfm fan
- Thread starter MoparMark91
- Start date
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MoparMark91
Well-Known Member
So I just pulled off old shroud and that flex fan and did some measurements I'm not sure with the new cold case that's 3 inch thick will fit the clutch fan? I heard of some guys using the HHR fan saying it pulls a lot of cfm? Is that true? Like more than the derale setup I was originally going to with?
MoparMark91
Well-Known Member
This is what it looks like with the champion 3 row. But I am putting in that cold case tomorrow when it shows up and it supposed to be thicker
70 Buster 340
Carbon Footprint
Are you running solid motor mounts?
Because that is close shown above
Because that is close shown above
MoparMark91
Well-Known Member
No just normal ones
70 Buster 340
Carbon Footprint
If the new one is even closer I'd be concerned. Maybe run poly mounts.
MoparMark91
Well-Known Member
Yeah I pulled off the flex fan and the spacer just so I could mock it up with the new Hayden clutch fan and that looks pretty close. Motor mounts are a few months old. I'm not sure why my engine would be so much closer
70 Buster 340
Carbon Footprint
It is where it is ... but... the motor does move around with rubber mounts.
Being they are new does help you some
Being they are new does help you some
Inertia
Well-Known Member
The trans mount is captured and restricts forward motion to less than 1/4 inch.
My son's been driving his car like this for near 10 years, and he's a very spirited driver.
https://www.forabodiesonly.com/mopar/attachments/fan-clearance-004-jpg.1715195331/
It would seem so but I don’t know for sure. I’d bet there’s a bit of science behind the use of less blades. One example is the MP Viscous fan package offered for years and years that came with 5 blades oddly spaced apart. All I know about it is, it really moves some air!
MoparMark91
Well-Known Member
Oh alright that makes me feel a little better about it then lol
I agree with you that in that one condition the shroud will be fine BUT most of the time the car is moving and for air to turn 90 degrees is not easy. And it WILL build up static pressure between the shroud and the rad and that WIll cause airflow issues at anything other than sitting still.
Spray a garden hose perpendicular to a flat piece of whatever your going to get wet.
Spray it at an angle and not so much.
Agreed, for more improvement, disconnect the field wire to your Alternator.
But in the real world (not the drag racing world) a mechanical fan will not fail you verses a poorly designed electric fan and shroud.
I'm not against electric fans or aluminum radiators for that matter, I just see post after post where someone has the newest latest aluminium radiator and electric fans and is complaining that they are overheating in one situation or another.
If an A body can run fine from the factory with a 383 or 440 under the hood with stock parts why recreate the wheel and cross your fingers that the new combination of parts will be good for a mildly worked over 318 or 340 or 360.
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pishta
I know I'm right....
Same argument says Ford Taurus' (even SHO) ran fine (as well as every transverse mounted motor) with stock electric fan only for ever. Air can turn corners just fine......its light. There is no fuel in suspension so they can make intakes with all sorts of 90 turns in it. Air in a rad plenum is no different but with a whopper of a chopper within 2 inches of it. I'm open to see some data on any high pressure readings inside a working fan shroud.
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You would be fine with that due to the, as mentioned, trans mount limiting forward movement. If the new radiator doesn't work out I can vouch for ECP radiators and the low profile 2947 Hayden clutch, at least in a 73+ spool mount A-body.
Mopar Radiators | ECP
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So sorry, where is the air turning 90*’s in the radiator system?
In a moving car? I’m having a problem seeing this.
Why? The amount of draw on the alternator is minimal.
How much power will a stock 3 core radiator dissipate? Better yet, or easier to understand, how much HP?
Is there a size difference between the small block and big block radiator? I have a stock 3 core unit in the wife’s ‘67 Cuda.
Anywhere other than where the hole in the shroud for the fan is. The air comes in and through the radiator core fins, then it has to turn 90 deg to find the hole in the shroud ( poorly made flat shroud) to exit.
If the fan hole in the shroud is smaller than the area of the radiator core there will be an increase in pressure in the shroud. But what I'm talking about is if you put a flat surface in close proximity to the back of the radiator a high pressure zone is created and it will slow the airflow.
It's not the load from the field cir, it's the load that the alternator puts on the engine trying to power all the load of the car.
40 amps worth of electric fans is 480 watts or 0.6 HP. On top of that direct conversion is efficiency losses, ie maybe it takes 1 HP (745 watts) from the engine to produce 480 watts for the fan.
From what I have seen the stock 383 radiator is physically the same size the inlet and outlet is larger in diameter.
I am sure the fins per inch and the construction of the tubes is different, not to mention the water pump, pulleys, etc.
I have a stock HP/AC radiator and a stock standard cooling rad. The tubes are the same except the HP/AC rad the tubes are (just numbers for example) 1/2" long by 3/16" wide vs 1/2" long by 1/8" wide.
All I'm going to say about the subject. If you think I'm full of **** so be it. I know what has worked and what hasen't in my life experience.
pishta
I know I'm right....
The Taurus 2 speed fan will pull 12 (165W) and 30-33A (415W). Thats nothing compares to a mechanical fans drag. Ill keep my electric and let the community determine what is best for their application with the data in this thread.
mopowers
Well-Known Member
Those Taurus fans are beasts! I've got one I'll likely use on the 66 BB Dart. The T-bird and Mark VIII fans blow a TON of air too. You can't beat OEM fans for electric, as far as I'm concerned. There're lots of good ones out there.
MoparMark91
Well-Known Member
Yeah I might give one a try
OH! Gotcha!!!! Poorly made fan shrouds!
It’s not that I think your full of it though I thought I was about to strongly disagree on a point or two. But clarification is what I was after. Thanks for clearing that up. Now it makes sense to me. Hence why I asked.
Also thanks for the radiator description.
Much appreciated.
This is very true.
Also giving thought to this move.
What’s the year for the electric fan set up?
Any Taurus?
pishta
I know I'm right....
^^ '95 or older 3.8's or this '98 Ford Coutour/Merc Mystique, talk about overkill! This one is thicker. Jeep liberty is another option from another site.
MoparMark91
Well-Known Member
So check it out guys I got everything installed with the cold case radiator and clutch fan and this is how close it sits. Also got the Taurus fan to take a look at it and see if that would work but tell me if this fan clutch too close for comfort
mopowers
Well-Known Member
How close is it? Sometimes pictures can be deceiving. What motor and transmission mounts are you running?
MoparMark91
Well-Known Member
Stock mounts except I might switch my engine mounts to the mighty mounts soon. You can get your index finger in between the two and that's about it I want to say half inch or so
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