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Unread 05-06-2013, 07:38 PM   #1
EZCJ
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Aluminum Radiator?

I am building a 350 to put in my CJ7. At the local machine shop, where I was having some parts cleaned up, I was advised against an aluminum radiator as they don't hold up well and harder to repair.
Seems like all the radiators I see online for this conversion are aluminum.
I am curious if there are any opinions or facts on this matter I should be aware of.

Thanks in advance.

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Unread 05-06-2013, 09:48 PM   #2
jeepster4245
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I have gone thru several radiators on my jeep in the last 30+ years, and 2 in the last year..I finally went with a champion alum radiator and it keeps the temp constant, cool, and does not leak..If you go traditional brass and copper research and get a good one..Been happy with the alum so far. Good luck.
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Unread 05-06-2013, 09:56 PM   #3
Galt
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Anyone telling you that aluminum radiators don't hold up well are just giving you their opinions. I have used aluminum radiators in my cars for over 10 years without any problems whatsoever. It sounds to me like you met salty dog who lives by old adages.
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Unread 05-06-2013, 10:11 PM   #4
offroadz
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Some good links at this site on aluminum radiators.
https://shop.performanceradiator.com...formation_id=7
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Unread 05-07-2013, 12:11 AM   #5
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Aluminum doesn't exchange the heat as well as a traditional radiator does.

That said, it is stronger, so they can make the "rows" bigger, and get by with less of them because you have more area.

So if you get a GOOD aluminum radiator, you'd be good to go. It's true that many radiator shops can't/won't/aren't good at repairing them.
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Unread 05-07-2013, 12:12 AM   #6
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Quote:
Originally Posted by Pacfanweb View Post
Aluminum doesn't exchange the heat as well as a traditional radiator does.

That said, it is stronger, so they can make the "rows" bigger, and get by with less of them because you have more area.

So if you get a GOOD aluminum radiator, you'd be good to go. It's true that many radiator shops can't/won't/aren't good at repairing them.
Aluminum. Transfers heat a lot faster then brass. What are you talking about
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Unread 05-07-2013, 12:18 AM   #7
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http://www.roymech.co.uk/Related/Thermo.html. read learn.
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Unread 05-07-2013, 12:26 AM   #8
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Quote:
Originally Posted by cavscout187 View Post
Aluminum. Transfers heat a lot faster then brass. What are you talking about
Radiators aren't made of brass, they are copper-brass, which is better than aluminum, and it's not even close.

That's what I'm talking about.

edit: Perhaps you should read and learn, not only about radiators and thermal conductivity, but how to post a working link, too.

Link
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Copper-brass conducts heat considerably better than aluminum does. Bigger tubes and more fins increase surface area. So why don't we build a five-core copper-brass radiator with huge tubes and a bunch of cooling fins? The limitations are material strength, weight, and airflow.

Copper-brass alloy isn't as strong as aluminum, so its tubes are more susceptible to blowing out under even the relatively mild pressure generated by a cooling system. Building a copper-brass radiator with a larger, more efficient 1-inch tube diameter requires thickening the tube wall to 0.015 inch-twice as thick as is necessary on a 51/48-inch-diameter tube. That means the larger tubes weigh over three times as much as the smaller tubes-not good! The compromise comes from building the tubes out of aluminum. An aluminum radiator using 1-inch-wide tubes with 0.016-inch wall thickness is 60 percent lighter than the same copper-brass radiator. The 1-inch-wide tubes increase tube-to-fin contact and cooling capacity by roughly 25 percent over a radiator built with 11/42-inch tubes. The net result? Griffin claims that a two-row aluminum radiator with 1-inch tubes will cool as well as a five-row copper-brass radiator with 11/42-inch tubes. That frees up some extra room under the hood, and the two-row design allows less restricted airflow through the core. More air equals more cooling.
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Unread 05-07-2013, 12:28 AM   #9
cavscout187
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Again read and learn. Simple physics format. Aluminum is on of the best metals for heat exchange.( transfer)
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Unread 05-07-2013, 12:37 AM   #10
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Aluminum radiate heat better copper conduct heat better aluminum gives off more heat.
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Unread 05-07-2013, 12:37 AM   #11
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Quote:
Originally Posted by cavscout187 View Post
Again read and learn. Simple physics format. Aluminum is on of the best metals for heat exchange.( transfer)
It is ONE of the best metals for heat exchange. It is NOT, however, as good as copper-brass, which is what regular radiators are made of.

The advantage aluminum has is, it's stronger and lighter. So they can build an aluminum radiator with say, 2 rows that are really big....thus exposing more surface area to exchange heat. This (they say) makes up for the aluminum not being as good a heat exchanger as copper-brass is. Copper-brass isn't as strong, so they rows have to be smaller and more numerous.

So the advantage aluminum has is weight and strength, not thermal conductivity.
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Unread 05-07-2013, 12:38 AM   #12
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Originally Posted by cavscout187 View Post
Aluminum radiate heat better copper conduct heat better aluminum gives off more heat.
That doesn't even make sense
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Unread 05-07-2013, 12:44 AM   #13
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Radiation is the release of heat. Conduction is the absorption of heat.
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Unread 05-07-2013, 12:48 AM   #14
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Radiation does not apply here, because radiation has no direct contact. Conduction has direct contact, e.g., the water and air physically contacting the radiator.

So radiation is irrelevant here.

Regardless, copper-brass is a superior CONDUCTOR of heat than aluminum, which is how cars are cooled.

Aluminum radiators can be made to work because of the strength/weight reasons I've previously listed.
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Unread 05-07-2013, 12:48 AM   #15
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Never thought I'd have to explain physics 101thremodynamics.
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