I spoke with a guy that works with radiators for a living. He told me to stay away from those dual cross type radiators. He seen them plug and for what ever reason more often than a single cross or down flow. I like the design and understand the theory behind double cross, but not taking any chances with those. It will be another single cross or down flow for me. what I saw with the last cross flow I had with everything running left 3 top rows exposed to air, no coolant in those tubes means less cooling. what ever fits best will determine what type I get. will take some more measures today. Thanks

Pretty typical from a crossflow radiator. Likely not filled completely filled to begin with. We fill them under a vacuum or run them pump a few times to make sure they are filled. Also check them after first heat cycle. Some of the OE ones can be a real bear to get full...

I have had a smsll Nissan radiator in my Dart for many years however for some reason my new 408 does't like it and it runs hot. I bought a Champion from Summit it fit nice and the car runs much cooler it was a good price around $200

Just another option for you to consider....
I bought one for my road runner and the fit was good. Mine was not the aluminum, and I had to order it.

http://www.usradiator.com/radiators/plymouth.html

Mark

Another vote for Champion I have them in 3 of my cars...

I have a big Griffin radiator in the cuda. Bolted right in and works great, but it was expensive. It's a down flow w/ two rows of 1.25" tubes. The Champion radiators that a guy sells in the classifieds here on the board I hear work good, and they're cheap too.

I fill to bottom of filler neck. been that way since new, had it for about 8-10yrs.

ok, thanks. it looks like a cross flow is in my future. opening in the support is 22.5 wide and 16 tall. I wanted to try something different this time around. I will take a closer look at those champions.

I have to make a correction about the double pass radiators. There are no issues in plugging like I was told earlier. Just spoke with two radiator companies and they both recommend double or triple pass for my app. Tripple pass requires bigger pump like a 55. No off the shelf available. must be custom 1.25" double row double pass. I also have an option of a 1.25" tube double row down flow. I plan on using a mechanical pump and good flex fan with a shroud. I have a fan that moves a ton of air.

Before you buy anything,I would google Stewart water pumps and read the stuff on their site. Then call them and ask them what they think of multiple pass radiators. They are not fond of them.


Cooling is about total flow and cooling area. If you have to make the coolant travel a longer path to cool the radiator is too small.


The EPC is a 2 core with 1 inch cores. With the right water pump and the correct water pump speed that will cool 750 HP easy.

That web page is stewartcomponents.com


A double pass radiator requires 16 times the pressure as a single pass to flow the same amount of coolant IIRC. A triple pass needs 64 TIMES the pressure to get the same flow as a single pass radiator. You need to look it up and read it for yourself.

It made me think differently about cooling than I had before.

My advice is, don't buy into the sales hype of 3 and 4 row radiators. Two rows will cool better. If you need more cooling, get one with 1.25" tubes. And install a sealed fan shroud that covers the entire fin pack!

After that last post i called howe to pick their brain on this. They tell me same thing its takes surface area to cool properly. They say double pass work marginally better but not enough to warrant the cost. They are not big on them. They tell me i need the biggest core that will fit with 2 rows of 1" tube. I may be able to make the opening in the core support wider to take advantage of more core area.

I have an ECP 26" core in my 68 Charger 512ci with AC & I am in South east Texas, in 107 outside temp with AC on car runs 185ish all day long, I had a 4core Champion that did not work so well in the same car.

I read the link to stewart components. Good stuff. At this point i feel like a ping pong ball with which design i need. Double pass will require more than a standard 440 source pump. Im thinking just ordering a jegs cross flow as large as i can fit in my A body. I will check out the ECP again but i think they were $500.

Did you put that 28" with in an A body? Curious to how well it fit. How big are the tanks?

Checked the site out for myself. They definitely need a new fluid dynamics engineer.

To toss out those Two numbers randomly 16 and 64 TIMES is insane. To many variables. If you were trying to pass the Whole Engines water system through a Heater Core, single, dual, triple, pass then it May be closer to the truth.

But the newer rads have a lot more flow capacity. But with that said, Yes, the dual; and triple pass rads will have more flow restriction, but Not Nearly the amount, the Stewarts web site suggests.

But, I will back peddle a little, the standard newer rads if big enough and with the right shrouds and fans are plenty enough to cool a lot of our rides. Lack of shrouds and fan placement is probably the biggest issues of poor cooling.

Dave, my Howe crossflow rad is a 19 x 31 for my A body. Had to trim some excess sheet metal from the driver side frame rail, and make a pocket in the passenger side front portion of the frame rail for it to slide in. So if your up for some miner fabrication you can go bigger on the rad.

I bought the 26 inch ECP for an A body. If you go by the print on their site it should all fit. You know, bolt it.

But, where they put the core relative to the brackets makes it so you have to modify the brackets and I had to drill some holes in the core support, which I didn't want to do. But for the money I decided that I could use the 2 top holes and put 2 small holes in the core support.

For the money you just about can't beat the ECP. I don't trust much of what frank at ECP says about fitment (which is why he will tell you measure everything and compare it to his print) but other than that, it's a nice piece.



All that said, if you don't mind doing some minimal mods to the brackets and core support its probably the best for the money. Also, I'd say use the biggest flowing mechanical water pump you can buy and you should be pooping in the tall cotton.



One last thing...I bitched like crazy because the overflow hose points to the drivers side and not the passenger side. It's is on his drawing like that, but it was the ONE thing I didn't look at close enough. I've personally never seen an OE Chrysler radiator with the over flow pointing to the drivers side. I just put a loop in the hose to the over flow tank.

Is that 19 X 31 a 26 inch core?


I don't run a shroud. The fan is close enough to the radiator to not need one.