You guys are my last hope...I've posted this on several other forums, and all I've gotten are the standard canned responses "just replace it", or "use whatever size was in the vehicle the engine came out of", neither of which apply to my situation, and plenty of advice on how to trouble shoot a cooling issue...while I appreciate the help, none of it addresses the actual problem - how do I know whether my setup is even adequate to begin with?" My problem is that I've got a '61 International, with a modified 258 engine out of a '73 Jeep (making roughly twice the power it did when it rolled off the line 37 years ago), combined with a partially clogged radiator full of stop leak. Not surprisingly, the truck runs hot, especially on the freeway I'm NOT seeking advice as to why the truck runs hot. What I'm looking for is how do you determine how big a radiator needs to be for a given application? Even if I do have other issues, the radiator still needs to be addressed regardless. Even if the truck didn't run hot, the radiator still needs to be addressed Second problem - the truck was running warm when I got it a few years back, so I have no idea if the current set up is even adequate. I haven't yet been able to match up the radiator that's in it to any factory applications, so I have no idea what it was originally intended for. The outlets are in weird positions, but it needs to be that way to clear accessories on the truck. It may very well be a modified radiator too. I don't really want to spend a the hundred or so to have this one cleaned/fixed or a couple hundred to recore the existing radiator only to find out it's still too small. But on the flip side, I also don't really want to go drop the several hundred on a new one made to fit, if all I really needed was to hot tank what I've got now and maybe have a small leak or two fixed. That's why I'm trying to determine if what I've got now is even proper for my application. I know there's got to be more to radiator selection that just "buy the biggest, raciest, aluminum jobber you can cram in there" I can't just go off of the square inches of core surface that came in the Jeep years ago, as those things were known to run warm anyways, plus my setup is vastly different than what came in the Jeep back then.
There is a formula if you do a goole search you can find it. But I can tell you up front that your IH radiator will cool the jeep just fine. Your problem is that you have an old clogged up radiator. I don't doubt that you don't want to hear this but you should probably loose all the polution control **** off the Jeep motor. Its a pollution control motor and they used to thik that running hot ment less pollution.
Pollution control stuff is long gone, lol. There's a Holley 4bbl carb on top of a Offy manifold, tubular header straight through to a gl*** pack. No cat, no air pump, no EGR, no ungodly wretched Carter carb, or any of the other stuff that might have been installed back then. It's been while since the truck has been on a dyno, but the rough estimates are that the engine is making somewhere around 180-190HP, vs the factory 110 for the 258. The radiator isn't the factory IH one, nor is it the Jeep one. I _think_ it's something from a Ford, but not positive. It's a crossflow, instead of the factory IH/Jeep stuff using downflow, filler neck on the p***enger side, and the lower hose outlet coming out at a 90 degree angle, pointing to the left at a roughly 45 degree angle. I don't recall the measurements off the top of my head, but I want to say that it's slightly bigger than the factory IH was, maybe a couple inches taller and wider.
Not likely you'll find a replacement IH rad at a reasonable price. You can buy a replacment radiator for a '65 mustang for 125-150 if you look around a bit. It will resemble the IH radiator somewhat and be a down flow. it will more than cool your jeep motor. That's what I have in my '61 Willys. It cools my early smog era V-8 just fine. From your description it sound a lot like you have a Scirocco radiator in your truck.
You profile says you are a computer tech. So you should be able to read the rules of this forum , which clearly states , Do a introduction post before you start posting on threads. right above where it says start a new thread , it states new to the H.A.M.B. introduce your self.
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