Koyo 3 Row Copper Radiator

[nnkfws333]

I just bought this and I looked at it but it doesn't look like a 3 row. I was wondering if anyone bought one how it looks. I will try to put up a pic soon, it's painted black but looks like the same size as the stock one. Anyone help? I got it off of enjuku racing for $200.

[VitaminT]

Isn't the Koyo copper radiator for the KA?

[nnkfws333]

I have no clue but I know the radatitor outlets are on the correct side for the SR. I was just wondering cause on their website it listed as 3 row and this just looks like an upgraded stock one.

[SpeedRacer1]

Its about twice the thickness of stock, 3 core? I dont think so. I wouldnt actually pay for one, just get the larger koyo radiator. I have one, but I got mine free.

[nnkfws333]

Thanks for clarifying that out Speedracer...do you know how much hp it is good for? I mean I thought it wasn't a bad deal for a $200 and it is twice the size so it's got to do a lot better than the stock right?

[SpeedRacer1]

I actually dont know what its good up to. But it is a discontinued product. If you really needed a radiator the I would get the newer Koyo's, Fluidyne's etc because they about twice as thick as this black copper. I think all the new ones are 3 core. The black copper is probably the same as stock, just more fins. So a 2 core.

[nnkfws333]

I think Im gonna sell the koyo on ebay or something and probably end up buying the 260Z radiator, seen a few people using them and probably do a lot better job cooling than the koyo copper 2 row dont you agree? Also does anyone know what kind of paint I can use on the radiator cause I like the black color?

[SpeedRacer1]

Not sure about the paint, but on an SR with basic bolt ons, the stock and koyo cool pretty good. I have never had any overheating issues, even in summer without any fans it hasn't risen above 175 degrees. Overheating is somewhere around 210.

But three major factors here are that my car is a daily driver, at stock boost, and I still have a SMIC.

[xxtrizz]

Im going to assume that the new radiators are aluminum? Its common knowledge that copper dissipitates heat better than aluminum. IE pc processor heatsinks

[VitaminT]

Shouldn't that statement be aluminum disipates heat better than copper?

[nrcooled]

Shouldn't that statement be aluminum disipates heat better than copper?

No he's right.

Once I went FMIC the stocker couldn't handle Virginia summers. I HAD to get a Koyo to keep my SR alive (and still run 14psi ) Since I got the Koyo I have never overheated...14psi in 94 deg f and pounding on the engine.:ylsuper

[NoStickers]

My sr overheated today and I was planning on getting the copper koyo and dual 12 fans tomorrow. should i just get the dual fans now and save for an aluminum? i dont like the sound of the copper being discontinued so would it work well?

[VitaminT]

Are the silver looking Koyos better or worse then the black painted ones then. I thought the Alum. koyo was what everybody got for about $335 and it was the best?

[SpeedRacer1]

The aluminum koyo's are twice as thick as the black copper koyo's.

[nnkfws333]

Hey NoSTickers I have one and I think Im gonna get rid of it since I got a better deal from a friend. I'll sell it to you if you want. It's actually on ebay..do a search for sr20det radiator and I see your from orlando so I could also just drop it off or you could come pick it up.

[hokiruu]

I have the same radiator. Don't be under the impression that it's not good because it is supposedly discontinued. Mine is marketed under the Essential label, but is really the same Koyo. Yashio Factory still sells alot of these under their name also. It doesn't cool as well as the 3 row aluminum Koyo's but I've been running it without any fans for four months of winter now, traffic, highway, and 13psi without overheating. I will be installing my Perma Cool 14" 2950cfm eletric fan soon, and am confident that combined with my Nismo thermostat and Blitz radiator cap, it will hold up very well. I spent the other $150 on this stuff rather than just a big radiator. Copper dissipates heat slower, but absorms heat faster. My theory is that with a fan that flows as high as mine, it will help move the heat away very well too.

[NoStickers]

i got some dual 12 in flexalite fans today and am going to see what that does and if i still have problems im just going to go with an aluminum koyo.

[Nathan]

Also, one of the only reasons copper radiators are not as efficient as aluminum is because of the heat transfer properties being hampered by the use of lead to braze together the innards of the copper ones. It doesn't transfer heat as well and makes the copper less efficient than the aluminum. This is the only drawback and its not a very large one. Also, copper radiators are a bit heavier. I went with the 260z one though, its frieking huge, a bit heavy, and not the highest quality...but it should cool adaquately and is very affordable

[NoStickers]

how much $$ would a 260z radiator run for?

[Nathan]

I got mine for like 140 shipped

[NoStickers]

where from?

[Nathan]

Honestly, I dont remember...I just googled it up and found the best price and went with that. The prices on them seem to be going up recently

[hokiruu]

Just in the past few weeks I have seen the 3 row Koyos all over Ebay for under $320, plus Enjuku has sales on them pretty often, even right now I think.

[NoStickers]

you arent referring to the copper one are you?

[VitaminT]

No he is talking about the alum. I think they are $329.99 at Enjuku Racing right now.

[NoStickers]

i was under the impression they were two row

[xxtrizz]

Im assuming that if koyo constructed the copper radiators with silver solder you would have the best radiator thermally. Silver and gold do a better job than copper with heat so if you got a Silver alloy such as this one

http://www.covington-engineeri...r.htm

and soldered the copper radiator together it would work at least 2 times better than a aluminum. Its just easier to work with aluminum that is all. If you are looking for support on your radiator i doubt youll find it for any of them especially if you bought it off ebay used or something.

Personally I would go copper I dont know why they painted the sucker black...stupid they should have painted it silver with a non electrically condusive silver paint. Woulda looked like aluminum and had twice the capability there of.

But nobody offers a competant copper radiator so dont bother.

[RiceBurner98sC]

You can find the aluminum ones on ebay for $300, even $230 plus 20 for shipping I believe from http://optionimports.com/ They have them listed on their site for I think $320 plus shipping, but on ebay for $300 or less.

[s13sr20chris]

here are my thoughts. copper corrodes, therefore the paint goes on. i think. aluminum is more difficult to work with than copper from my perspective. copper is more maleable(sp?). i think. aluminum tends to tear when bent. i imagine the black paint on copper radiators hampers the heat transfer. copper is cheaper yet any performance car has an aluminum radiator? i think the oems are on to something. just thoughts. i dont remember the heat transfer properties of aluminum or copper. oops.

[xxtrizz]

Coppers heat transfer is definitly better. But I think the problem they had with corrosion was when they mixed 2 different metals together and welded them that way. A mix of two different metals will kinda corrode stuff. ITs easier to weld aluminum with a aluminum metal or use that alumaloy stuff. SO fixing and peicing together a aluminum radiator is easier.

But A copper radiator will I assume last quite some time. Even if you have to replace it in 20 years good luck if your engine lasts that long. I dont know about the copper corroding from the liquids internally but copper heatsinks are run with water all day long so there isnt much going on there.

Final line is Copper works better with heat. Do not mix or weld copper with other metal such as soldering on aluminum peices to copper ones. IE : copper fins on aluminum tracks. Also the statue of liberty is made out of copper that is the kind of aging copper goes through, but keep in mind that statue is older than we are by far.