Classic industries radiator finally gave out

Heating / Cooling / AC

  1. 71DodgeDemon340

    71DodgeDemon340 Well-Known Member

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    I measured the thickness, from the core support my current radiator is 3” deep. The new radiator is 3” deep. My current radiator appears to have a 2-1/4” core, but the core is offset towards the fan, the core is about 3/4” inset from the front but is flush with the back. I should have plenty of room but we shall see
     
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    • Slantsix64

      Slantsix64 Well-Known Member

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      • 16richard

        16richard Well-Known Member

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        Just a thought but why not find the leak (pressure test it) and repair it with a propane torch, solder. There are like chains they break at the weakest link. I have repaired rads (for pennies) decades ago because it took less time than finding a replacement and they still hold pressure today.
         
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        • Col_Steve

          Col_Steve Well-Known Member

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          I would never ditch the clutch fan to gain radiator core clearance. The OEM 3 core narrow brass/copper is enough cooling for an A-body 426 HEMI, and enough for a 340 A-body with A/C. The clutch fan and proper shroud are the secret to proper cooling and don't steal 20 HP and make a bunch of noise in getting it done. I'm currently using the original 53 year old three core mopar radiator in my 69 Barracuda to cool a stout 468 automatic with A/C. It has proved to be capable up to air temperatures of 95 degrees in traffic with A/C on. Maybe 100 degrees would exceed its capability but seldom do we see such temps in mid-Michigan.
           
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          • Jarlaxle

            Jarlaxle Well-Known Member

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            Nothing wrong with 195 degree coolant...that's where it should be. Even hotter is no issue...ive driven many vehicles that ran 200 or hotter, all the time.
             
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            • Rat Bastid

              Rat Bastid Dunamis Metron

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              If you want to clan up the exhaust a LITTLE then this stupid hot coolant temperatures are great. If you want to run some compression and make some horsepower 180 is IT and that’s too hot. 160 is the best for a street car that needs a heater. Plus it’s damned hard to get much below that on a street car.

              It’s long past time to stop saying high coolant temps are good. They are not.
               
            • Car Nut

              Car Nut Mopar Master

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              Especially with the fuel we have nowadays.

              I agree, look at my new Daytona gauge, and that’s normal.

              386FEB87-498A-4EDE-B56A-708B8A3B1095.jpeg
               
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              • 72bluNblu

                72bluNblu FABO Gold Member FABO Gold Member

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                160-180 temps are drag race, track only stuff. It's not peak efficiency, it's peak power for a VERY short period of time. It's not the best operating temperature for efficiency or longevity.
                 
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                • Rat Bastid

                  Rat Bastid Dunamis Metron

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                  Thats just not true. Have you ever done it? And used the appropriate compression ratio? If you ever do it you’ll wonder why you didn’t do it before.

                  It isn’t less efficient and it has ZERO affect on longevity if you do it correctly. I suspect you’ve never done it and you are speaking from conjecture and speculation.
                   
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                  • Jarlaxle

                    Jarlaxle Well-Known Member

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                    Or oil dilution.
                     
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                    • Rat Bastid

                      Rat Bastid Dunamis Metron

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                      Fix your carb then. Fuel dilution is a tuning issue.
                       
                    • 72bluNblu

                      72bluNblu FABO Gold Member FABO Gold Member

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                      What’s your deal? I didn’t disagree that drag racers tend to run and tune their cars to run 160-180 at the track. They do and it works. But it’s not reasonable or smart to continuously run a street car like that, especially at the low end of those temperatures.

                      And if you look at other motorsports, pretty much no one else runs their engines that cold. NASCAR runs their engine temps at 290*F, because air flow and drag is more important. NASCAR is clearly a special case, but so is drag racing.
                      The Fascinating Reason Why NASCAR Engines Run So Hot

                      And I can tell you that the 340 in my Duster, as it’s tuned, does in fact run much better at 190-200 than it does at 160-180. I actually changed out the thermostat and reprogrammed my electric fan controller to raise the engine operating temperature to keep it between 190-200, previous to that I had been keeping it at 180. And if you go back at my build thread and look at why I ditched my mechanical fan and went electric in the first place it was because the car was running cold, and it wasn’t running as well as it did when it was hotter.

                      So yeah, I’ve tried it. I’m not gonna say that’s best for everyone or every engine, but 160-180 is a drag race trick, and it doesn’t carry over to the street or many other motorsports.
                       
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                      • Rat Bastid

                        Rat Bastid Dunamis Metron

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                        It’s not a “trick” drag race or otherwise. It’s simple physics. You have to tune for it. It’s not hard.

                        Just because I’m curious how much compression do you have and what carb do you run? Cold air intake or heated?
                         
                      • Jarlaxle

                        Jarlaxle Well-Known Member

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                        No, it's also a temperature issue.
                         
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                        • 71DodgeDemon340

                          71DodgeDemon340 Well-Known Member

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                          Got a email notification that my wizard cooling radiator is on the way
                           
                        • 71DodgeDemon340

                          71DodgeDemon340 Well-Known Member

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                          Radiator showed up today, looks great, got it mocked up in the car, needs a little adjustment here and there but not too bad, one thing i wanted to ask is how much clearance should be between the fan clutch and radiator core? Right now without the radiator being tightened to the core support i have roughly 7/16” between the fan clutch and core, im thinking when its tightened up it might open up to 1/2” of clearance, is this enough?
                           
                        • Rat Bastid

                          Rat Bastid Dunamis Metron

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                          I forgot to mention I read this link, and if you read it correctly they make LESS power with coolant temperatures as high as 280-290 degrees. LESS power. Plus it’s harder on parts. Plus they run 100 PSI on the system.

                          They do it for aerodynamic reasons, not to make more power.
                           
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                          • 72bluNblu

                            72bluNblu FABO Gold Member FABO Gold Member

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                            1/2” should be fine, that’s about the minimum you’d want but it’ll work. Might want to make sure your engine and transmission mounts are in good shape as you won’t want a lot of movement there.

                            Yeah, I said right up front it was for aerodynamic reasons, check my post - “air flow and drag”.

                            My point is that it’s stupid to tune your street car based on what a race car does. Pro-stockers try to run 100-120* at the start of a run. NASCAR runs 300*. Both are detrimental for the life of the engine and highly specialized to that type of racing and class rules. 180*-200* is perfectly acceptable for a street car, even 210* wouldn’t bother me a bit as long as it could maintain it. 160* is basically the minimum operating temp to prevent valve train wear and quite frankly isn’t realistic for a real street car in real world situations.
                             
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                            • 71DodgeDemon340

                              71DodgeDemon340 Well-Known Member

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                              yeah its probably close to 7/16” motor and trans mounts are good plus i have a torque strap. I shaved down the fins by about 1/8” to get me at least 1/2”. Will it hurt anything for the fins to be 1/8 shorter? I only Did the center fins closest to the radiator, the outer portion of fins have plenty of room
                               
                            • 71DodgeDemon340

                              71DodgeDemon340 Well-Known Member

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                              Got the fan and clutch mounted up, looks like i will have right about 5/8” between the clutch and the core. Not sure if shaving the fins down slightly will have any ill affect on the clutch


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                            • Car Nut

                              Car Nut Mopar Master

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                              If it was me, I wouldn’t run a clutch.


                              Just my two 11DC3A90-29E8-4C39-8298-BBB54ACF43F7.gif
                               
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                              • Daves69

                                Daves69 Well-Known Member

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                                Too close IMO. Others have said that 1/2" worked out OK for them. Solid mounts?
                                FWIW the MP............
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                                • 71DodgeDemon340

                                  71DodgeDemon340 Well-Known Member

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                                  i should have right at 5/8”
                                   
                                • 71DodgeDemon340

                                  71DodgeDemon340 Well-Known Member

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                                  Got the radiator in its final resting place, had to open up the mounting holes some but its to be expected. waiting on a new lower hose and have to trim one little spot on the aluminum shroud and should be ready to fire it up


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                                • Car Nut

                                  Car Nut Mopar Master

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                                  That’s not bad, it’s not that close.
                                   
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