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Discussion Starter #1 (Edited)
My theory of running dual radiators. Excuse the crude drawing, I'm using poor man's CAD (paint). I don't think we have a thread discussing this exclusively so lets discuss it here.



I have never done this but I THINK this is how it should work. In the parallel example on the left, both fans should kick on and off at approximately the same time since they are both receiving the same amount of heat from the engine.

In the series example on the right, the stock radiator fan should come on first and the aux radiator fan should only come on if the stock radiator can't keep up with the heat.

Ideas? Pro's? Con's?
 

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Kajun Mud Slingers
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Nice bruin.

i think it would work the best in series so that it is forced to work through the two radiators before returning to the engine. if you run it in parallel you will just split your coolant up into the two radiators. one would cool better than the other but if you ran it to the lower one first then the upper one or vise versa you would have two different stages of cooling with alot more area to travel creating more cooling. thats just my opinion.
 

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Our ATV group went on a ride two weeks ago and two of us had our quads overheating after going through a couple mud holes. My brute was one of them. One of the guys actually suggested this same thing. I looked at mu buddys Can Am rad and the fins were much wider apart and was less clogged than mine. And the fact that his was not overheating said a lot. So I think a better quality rad and or a second rad would definitely help bring the temp down especially when the primary is getting clogged. My only concern was cost. I did not want to invest $400 for a rad upgrade. I also do not like the look of the relocated rad. And I even took off my front rack. I was wondering if I could put a second smaller rad in front of the stock probably lower.
 

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Nice bruin.

i think it would work the best in series so that it is forced to work through the two radiators before returning to the engine. if you run it in parallel you will just split your coolant up into the two radiators. one would cool better than the other but if you ran it to the lower one first then the upper one or vise versa you would have two different stages of cooling with alot more area to travel creating more cooling. thats just my opinion.
Agreed:haha:
 

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Kajun Mud Slingers
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Dont know if you would be able to fit a second one that would do any good under there. might have to relocate your aux one for big rides and leave your stock one down low. i dont see me doing this as i dont have the overheating problem since i put it on my rack. but like you said if you leave your stock one down low and put a smaller one up high it may work our for you.
 

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Discussion Starter #6 (Edited)
Here's an extremely simple way to wire up the aux fan. This is assuming the temp sensor is mounted in the radiator. There are many ways to do it, this is just one way.

 

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Discussion Starter #7
I was wondering if I could put a second smaller rad in front of the stock probably lower.
It would benefit you a little to have a second radiator in the same location but consider the drawbacks.

1. The second one is still low and prone to clogging with mud.

2. If you are going to one fan to pull air through them both, you'll be pulling the hot air from the front radiator directly onto the rear one.

3. If they both get clogged, it'd be difficult to get them both clean if they were kind of stacked together.
 

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In a series for sure, i would probably add an electric auxiliary water pump to assist in getting the water through the stock radiator on up to the racked radiator
 

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Why not run a larger rad,instead of 2? Something out of a ....say ford escort?
 

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Discussion Starter #12 (Edited)
I sure that would work also. Depending on the size and mounting locations available. I guess if you didn't care how it looked, you could mount a radiator out of an F250 on the rear rack. LOL
 

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I was using the escort rad as an example. I paid less for the 4 core in the race car, then what kawi wanys for a replacement
 

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Discussion Starter #14 (Edited)
Yea I know, I was laughing with you not at you. No doubt about it, unless you can run across a good deal on one, having two radiators would be expensive.

:beerchug:
 

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i like the idea of the series but what if instead of trying to push water to the top (left image) why not let gravity push it down (right image) through the radiators back to the engine

 

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Discussion Starter #16
Yep, that would work also, maybe even better. That would change your primary rad to the top one. It would come on first and if it couldn't keep up, the bottom one would kick on and help.
 

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Since the bottom radiator (in mud) is deemed useless anyway...I would think make the rack mounted radiator the Primary cooling unit and let it go through the stock radiator for shigs and tiggles.

I agree with pushing water up to the top radiator and letting it flow down rather than "pushing" water through both units. The usage of more coolant will aid in heat reduction as well.

Just my .02
 

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Since the bottom radiator (in mud) is deemed useless anyway...I would think make the rack mounted radiator the Primary cooling unit and let it go through the stock radiator for shigs and tiggles.

I agree with pushing water up to the top radiator and letting it flow down rather than "pushing" water through both units. The usage of more coolant will aid in heat reduction as well.

Just my .02
:agreed:
 

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If you are going to use 2 radiators, why not put them in series and mount them both on the rack side by side sorta angled off from each other. As far as bringing on the fan, you could use just one sensor to bring on both fans. Use a sensor mounted in the second radiator that the coolant hits. If the coolant makes it through the first radiator, and is still too hot at the bottom of the second, then let the system bring on both fans. With this set up, both radiators would have be able to drop the temp of the coolant before bringing on a fan which would keep your fans off longer. What do you think. I know two radiators would take up loads of room on the rack, but it looks good on paper. :34:
 

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^you would still have to push coolant thru both radiator

i would like to see the look of two radiators on the rack
 
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