Chris, give Don at Alumitech a call, 517-404-6262. He can hook you up with a great product.so who makes a good big alum rad to cool around 800 plus HP without spending a ton of money cause man these are expensive,Ive got some good dual elec fans to try to put on one ,Thanks
I've been waiting for this explanation for days. I've been sifting through various discussions thinking to myself that no one really understands why the two types of radiators are like apples and oranges. I knew in my own head that aluminum isn't a great conductor of heat because of how it reacts when you wrap something in aluminum foil and put it i the oven it takes longer to heat and you can usually touch the aluminum without burning yourself. On the copper side if you feel under your sink hot feels hot and cold feels cold because it's conducting that temperature quickly. I just couldn't make sense of the various commercial claims for why a 2 core aluminum radiator was as good as a 4 core copper and brass. I knew it had something to do with surface area but beyond that I couldn't quite nail it down.FYI keep in mind 3-row and 4-row copper brass radiators and 3-row and 4-row aluminum radiators are not the same thing. You are WAY better off with a copper/brass 4-row than a Chinese aluminum 4-row.
With copper/brass radiators, the largest tubes that can be used are 5/8". Some cheapies use 3/8" tubes. HQ pieces will use 1/2" or 5/8" tubes. Beyond 5/8", copper isn't strong enough to withstand the burst pressure. With aluminum radiators, the tubes can be made much larger, such as 1", 1-1/4" or 1-1/2" since aluminum is a much stronger material than copper.
So with copper/brass, since you are limited with tube size, the only way to get more cooling is to add more rows. The downside is when you add a row, you also a 'tube gap', which is the space between the tubes in the core. Typically this a 1/4". So if you add an extra row with a 5/8" tube, you add 7/8" to the overall thickness of the core (5/8" tube + 1/4" tube gap). The problem is heat transfer only occurs where there is direct tube-to-fin contact. So you've added 7/8" of core thickness, but only 5/8" of it is transferring heat. The other 1/4" just makes the core thicker and more difficult to get air flow through. Multiply this times 4 and you quickly have a core that has a bunch of dead space that isn't transferring any heat, yet is very thick. These tube gaps are also very disruptive to airflow through the core and act like speed bumps for air flow. Very similar to having an intake that isn't port matched to the cylinder heads.
With aluminum, since the tubes can be made so much larger, you get the same surface area with a much thinner core. A big 4-row copper/brass radiator with 1/2" tubes is typically 2-3/4" thick. A 2-row aluminum with 1.0" tubes has more surface area (if you count the tube crowns) and is only 2-1/4" thick. Copper/brass, as a material, transfers heat better than aluminum. Yet the aluminum radiator transfers more heat because it is so much less restrictive to air flow over the core.
The whole benefit of using aluminum is to use fewer rows with larger tubes. The Chinese aluminum 4-row radiators use tiny 9/16" tubes. A 4-row copper/brass radiator is going to transfer heat WAY better than a 4-row Chinese aluminum radiator. Yet they sell the 3-row and 4-row aluminum radiators with tiny tubes like free booze because people don't know any better.