I'm looking for first hand advice for cooling the 392 Hemi in a JKUR . Anyone have experience with this?

 

OK this may be the same as the Motech 6.2 Gen V Chev conversion and in that they recommend chucking the original rad (which can be used in the 5.3 conversion BTW) and going with a dual core aftermarket replacement. I can offer this advice - whatever you use DO NOT short cut on blocking all passages that can let the air bypass the rad. Make as much air as possible go through the rad to make it cool better. Also do not put things in front of the rad that give off heat EG Tranny and engine oil coolers. No choice with the AC condenser though. I am mounting my tranny cooler up high between the chassis rails almost over the diff. Engine oil cooler goes under the winch and protected by the bottom plate of the front bumper. Use a flashlight in the dark once you think you are done to see where there will be other leaks around the rad. The other piece of advice is use the biggest hurricane creating fan you can get. In my case Motech provided the Camaro SS fan run off the Chev ECU. In your case I would think a Challenger Hellcat fan set would be ok if it fits physically. Make sure it is a PWM control input. All the best with that conversion but the wonder I have is if you are going conversion kit from a vendor then they should know exactly what you need. Good luck as they take longer than you think but I am sure you will enjoy it when done.

 

Thank you for the great input and advice!!!
the only thing I can add is I'm trying to determine what I can purchase on my own so I don't pay a mark up at the vendor. And pass this on to others.

 

No problem. I see you live SW of me just over the border. We go to Flathead Lake/Bigfork fairly often.

 

what conversion kit did you use? ive had the 6.4 with aev kit in my dd for about 8years now with no overheating issues or really any other issues. currently have the single core rad that comes with aev kit, no ac. factory 2007 jk fan. also have the ps hood louvre.

i live in alberta so we dont typically see many hot days.

 

Yaak,

I had a 6.4 Liter in my 2014 JKU. I used an AEV kit, switched radiator to a C & R Racing unit, used Pentastar PWM, fan that was able to run @ 100%. I never overheated even at 100* ambient temps. Keep in mind that a V8 in these JK's almost need the fan on all the time, especially off road and pulling long grades. My fan turned on @ 210* & off @ 204*. I don't believe you could cool a V8 JK if pulling a good sized camper or enclosed trailer in the Summer time but smaller ones work well. The Jeep has all the power you'd ever need but you can only fit a moderate sized radiator in the front of these JK's without cutting sheet metal.

 

That's the kind of input I was looking for. It's good to know that after 8 years things are still going good. And the C &R radiator with the electric fan will be my choice.
So far I haven't seen any negative comments about the V8 conversion from anyone who has made the swap.

 

Your not going to see negative comments from anyone thats done it..no one likes to admit they have problems after spending $$$$$$
Especially Hemi swaps.