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Author Topic:   aluminum or copper rad?
fastfrank
Dirt Roller

Total posts: 17
posted February 14, 2003 09:51 PM  
Whats better a 4 core or an aluminum rad? A few guy have told me that an Aluminum may give me trouble after i come off the track. Sound fishy.

Frank

jhon hollomon
Dirt Freak

Total posts: 468
posted February 14, 2003 11:01 PM  
I've ran both and both kept my car cool. I think I liked the aluminum one better. It seemed to keep the car at just the right temp.

dirtracer7
Dirt Freak

Total posts: 337
posted February 14, 2003 11:41 PM  
Aluminum get the biggest one that you can fit in.

bryanb30
Dirt Freak

Total posts: 243
posted February 17, 2003 07:57 PM  
ive heard that some aluminum radiators have epoxy holding them together and if you overheat your engine it frys the epoxy and the radiator is fried too...i have a howe and it been used and abused (im like the 3rd owner) and its still fine

trey_#23
Dirt Maniac

Total posts: 150
posted February 17, 2003 08:26 PM  
Get the aluminum. The prices are about the same and you have a better selection. The only problem is getting one repaired. A lot of radiator shops around here won't touch aluminum. And that's the only problem I've ever had with one. I know some old school drivers that won't use them - say they are to expensive ($170 and up) then pay $200 for a used 4 core copper. Go figure.

SLEEPY GOMEZ
Dirt Freak

Total posts: 295
posted February 19, 2003 10:30 PM  
Copper/brass has better heat transfer than aluminum when the copper/brass is unpainted. Radiator shops paint them black for corrosion protection on the road. I finally learned not to use a used radiator. Just because they don't leak doesn't mean they are good. They corrode inside. This corrosion is a heat insulator. Today the new price of alum and copper ones are about the same. The alum is lighter and cools almost as well, especially the ones with wide tubes such as C&R. I vote for a good alum everytime now. Keep your cool, SLEEPY

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted February 20, 2003 07:33 AM  
sleepy is absolutely correct. one of the biggest problems with aftermarket aluminum radiators is the the tubes are too few and too big. the latest technology in radiators is to use more smaller tubes and more fins per inch.

it's easier to cool 4 thin streams of hot water(4 core copper with 1/2" cores) than it is to cool 2 thick streams of hot water(2 core alum. with 1" cores).

Pickel
Dirt Forum Champ
Total posts: 784
posted February 20, 2003 10:31 AM  
Outlaw I think wider is better, more surface area touching the fins. afco sells repair solder (plastic) that works great on alum and copper.

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted February 20, 2003 02:15 PM  
powerglides, the information i provided came straight from a radiator professional. thinner streams of coolant are more efficiently cooled than big streams. a lot of the newer radiators are made with 3/8" cores and have more fins per inch than ever before. the new cores are called high efficiency cores and do a better job of cooling. more fins per inch is where you get a lot of surface area.

don't take my word for it, call a radiator supplier in your area.

dirtracer7
Dirt Freak

Total posts: 337
posted March 03, 2003 07:55 AM  
Outlaw had a talk with c& r on rads.I was running a used winston cup 28x16 4" core double pass and was having it running alitle warm 215 deg..Rad is boxed in and I have a air dam.They said the reason I had problems was because of to many fins per inch on the rad.The rads I have where 18 fins per inch.I was told that they don't recomend any more than 14 per inch on the short track.I wasn't going fast enough to get enough air through it.They said I would need to be running about 140mph to acomplish that.I've been runnig a 31x19 aluminum 2 core and she stays at 195 truogh the race all welded.Jb weld or some stuff called lab metal will do a good job making repaires on aluminum rads.I have a 30x16 4" core in real good condition if anyone needs one.I also run dual spal electric fans I got from Rousch used real cheap.

DirtDevil351
Dirt Roller

Total posts: 11
posted March 18, 2003 08:08 PM  
well would a big 4core out of like a station wagon do the trick for keepin it cool?

DirtDevil351

------------------
First On Race Day

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted March 18, 2003 08:48 PM  
yes, dirtdevil. a 4 core copper radiator will do the trick. the previous post by dirtracer doesn't consider the thinner tubes of a copper radiator. it's easier to cool a thin stream of water than a thick one.

also a winston cup radiator has way more fins per inch than the high efficiency cores i was talking about on my previous post. the high efficiency cores are designed to be used on the street where speeds are slower than on a short track.

Slam_Shifter
Dirt Full Roller

Total posts: 53
posted March 19, 2003 09:16 PM  
One thing on the Winston cup radiators. They are a sweet piece but if you check around they are also track specific. Like the previous post stated his was rated at about 140 MPH. The cup boys run on the ragged edge with everything they build so their radiators and cooling systems are tuned to each track just as the rest of the car. Same with the thick and thin tubes. How well they work depends on how we have them set up for air flow and how fast we run ect. Check around what the other guys in your area are running and how they have it ducted. It should give you a few ideas in the right direction. I like aluminum but if you buy the wrong one for your situation you will hate it.

Slam_Shifter

dirtrace54
Dirt Maniac

Total posts: 192
posted March 27, 2003 04:11 PM  
I agree with Sleepy on the aluminum. Aluminum is better for cooling. One big thing to keep in mind is to properly shroud your fan and on dirt you need to continiously clean it out. Running a good screen can also help protect your investment.

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted March 27, 2003 06:44 PM  
dirtrace, sleepy said that copper/brass transfers heat better than aluminum. a high efficiency copper/brass core will cool your engine better. it's 21st century technology. i didn't believe it either until i did the research.

[This message has been edited by outlawstock17 (edited March 27, 2003).]

dirtrace54
Dirt Maniac

Total posts: 192
posted March 31, 2003 11:09 PM  
Sorry outlaw....again I word something poorly. I ment I agree with Sleepys choice of using aluminum. I was thinking rite and typing wrong. I meant aluminum is better for racing, not cooling. Sorry about that

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