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Old 03-23-2009, 12:58 AM   #1
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Default Quick Radiator Shroud

I know people have posted various pictures of their shrouds, and there's been a debate as to what works better, etc., but I don't remember a thread that shows one being made (not that it's that hard to do). With my PWR radiator and FM front sway, I was space limited, so here's what I made today:

Started with plexi from Home Depot, 1/4" thick (about $40), (2) 12" slim fans from SiliconeIntakes.com, and my PWR.
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Made some measurements, marked the plexi, pulled out the table saw, and cut it down to size:
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Used a powered hand saw and made the cutouts for the inlet and outlet tubes (my cuts were just a tad rough, thought I had the right blade the first time. Oops):
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Then drilled holes for the mounting bolts (I also cracked the plexi a little during this step, but it's ok, it's still structurally sound at the end of all this) :
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Then I drilled holes and mounted the fans:
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Then I traced the outlines of the outer diameter of the fan blades:
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Hand saw again and removed all the clear protective plastic and:
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Remounted the fans:
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Applied weather stripping:
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Finished. Sturdy as hell and will put all the airflow through the fans.
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It took maybe 2 hours to do, if I did it again I could probably do it in less time, but I spent a lot of time checking measurements and bolt hole placement. I could definitely not crack it the next time around either, that was the result of drilling a bolt hole and the plexi being uneven when the drill broke through. Other than that, it went well.

Hope this helps someone out.

Last edited by RotorNutFD3S; 03-23-2009 at 01:58 AM.
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Old 03-23-2009, 11:33 AM   #2
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Will both fans be wired to run at the same time? Usually one comes on with the AC.
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Old 03-23-2009, 12:37 PM   #3
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I should have done that when I did my fans. Looks awesome! Came out very nice. I will more than likely copy this in the spring time.
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Old 03-23-2009, 01:02 PM   #4
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that looks great eric. now GET THE DAMN CAR RUNNING
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Old 03-23-2009, 01:53 PM   #5
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Nice job Eric, let me know how that foam holds up as that's what I intend to use.
https://www.miataturbo.net/forum/t15465/
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Old 03-23-2009, 02:17 PM   #6
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so is it sealed all the way around with the foam? i cant tell from the pics.
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Old 03-23-2009, 02:29 PM   #7
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Hey, NICE radiator.

Better shrouding technique. It localizes the cooling effect unlike a funnel shroud which draws through the whole thing of course, but I'm sure you're aware of that. It shouldn't be a prob with a PWR anyhow, and certainly a LOT slimmer.
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Old 03-23-2009, 02:50 PM   #8
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Quote:
Originally Posted by leatherface24 View Post
that looks great eric. now GET THE DAMN CAR RUNNING
I'm working on it as fast as I can! A guy locally is cutting me a spacer for my "holy grail" coolant reroute this week. lol If he gets it to me when he said he would, then the engine/trans should go in this weekend. Then it's waiting for the differential and injectors to return. Gotta get my cat from Enthuza as well. So close...

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Originally Posted by Zabac View Post
Nice job Eric, let me know how that foam holds up as that's what I intend to use.
https://www.miataturbo.net/forum/t15465/
Thanks! FWIW, I've used this stuff before for a shroud, just the generic stuff from HD. After a while it will harden some and shrink a tad, and you might lose a little bit of sealing, but not enough to worry about, unless you're really OCD about it. I doubled up on the sides as the core is a little deeper than the endtanks. You'll be adding a couple of layers if you still have goals of 1" off the surface unless you find some thicker stripping than I did (I bought the thickest stuff they had in stock). The plexi on miy shroud is only 1/2" off the endtanks, maybe 5/8"-3/4" off the core.

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so is it sealed all the way around with the foam? i cant tell from the pics.
Yep. Top, bottom, and sides. It's the gray stuff that goes all the way around the edge of the plexi.

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Originally Posted by gospeed81 View Post
Hey, NICE radiator.

Better shrouding technique. It localizes the cooling effect unlike a funnel shroud which draws through the whole thing of course, but I'm sure you're aware of that. It shouldn't be a prob with a PWR anyhow, and certainly a LOT slimmer.
Thanks. Yup, after reading numerous threads this seems to be an accepted method for those that are working with limited space between radiator and sway bar. I never had a problem with coolant temps before, but figured that doing this is a good idea after adding a larger intercooler and a/c condenser.
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Old 03-23-2009, 03:29 PM   #9
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Very nice. I did the same thing with ABS. Make sure you have a switch of some sort to toggle the second fan; my car idles at 184 with a 180 thermostat with only one fan on.
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Old 03-23-2009, 03:47 PM   #10
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Thanks Sav. Your thread was the primary reason I tackled the project this weekend. I was searching and reading all the arguments in the various threads on here about shrouding and your thread was pretty much the most recent one, so I said "F- it" and made it. lol
That's pretty impressive though. What are your cruise temps like? Any issues as some people are claiming they create?
As for the operation, I think I want to run the OEM setup (so the 2nd fan comes on with the a/c) but also have a switch to control the 2nd fan manually. Is that what you're doing?
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Old 03-23-2009, 04:20 PM   #11
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It seems to be designed for both fans to be used concurrently. Is that your intention?

If not, single fan operation may draw a significant volume of air backwards through the idle fan.
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Old 03-23-2009, 04:57 PM   #12
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Good work, but unnecessary.
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Old 03-23-2009, 05:03 PM   #13
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Quote:
Originally Posted by sixshooter View Post
If not, single fan operation may draw a significant volume of air backwards through the idle fan.
If that were the case, the OEM fans would be doing the same thing, and I'm pretty sure that's not the case. They're not shrouded in this exact manner, but their shrouding does pretty much cover up most of the open space outside of the direct fan blade area.
At the same time (correct me if I'm wrong here) the area in front of the radiator is high pressure and the area behind it is low pressure. There's no way the air can flow backwards. But I'm definitely not claiming to have a lot of knowledge in air/fluid flow. lol

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Good work, but unnecessary.
So the argument goes...
I say if it shows an improvement or doesn't hurt anything, it stays. If it causes problems, it goes.
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Old 03-23-2009, 05:22 PM   #14
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Quote:
Originally Posted by RotorNutFD3S View Post
If that were the case, the OEM fans would be doing the same thing, and I'm pretty sure that's not the case. They're not shrouded in this exact manner, but their shrouding does pretty much cover up most of the open space outside of the direct fan blade area.
At the same time (correct me if I'm wrong here) the area in front of the radiator is high pressure and the area behind it is low pressure. There's no way the air can flow backwards. But I'm definitely not claiming to have a lot of knowledge in air/fluid flow. lol
The difference between stock shrouding and your shroud is that in the OE case, each fan is shrouded individually. If I were you, I'd hook both fans together.
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Old 03-23-2009, 05:35 PM   #15
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Quote:
Originally Posted by Atlanta93LE View Post
The difference between stock shrouding and your shroud is that in the OE case, each fan is shrouded individually. If I were you, I'd hook both fans together.
Makes sense as well. That wiring setup was the other plan. I definitely want to use this to it's fullest potential, whatever that might be.
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Old 03-23-2009, 06:35 PM   #16
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Just run a strip of weather stripping down the center between the fans. That'll seperate your shroud into individual cavities.

--Ferdi
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Old 03-23-2009, 11:07 PM   #17
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If you don't want to crack plexi when drilling, I was told to run the drill in reverse.
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Old 03-23-2009, 11:17 PM   #18
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I had no problem with the plexi cracking, I used high speed and low pressure on the drill.
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Old 03-23-2009, 11:19 PM   #19
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I just drilled a bunch of plexiglass (acrylic) for a model I built at work. After I cracked my first few holes, one of the machinists took a standard drill bit to a grinder and put a tiny flat on the cutting edge of the bit. This keeps the bit from getting 'pulled through' when it penetrates the far side. I also placed a block of wood underneath the spot I was drilling. Those two things took me from cracking every hole I drilled (even being very careful, reverse drill, etc) to not cracking a single one. I drilled about 30 holes in a row with no cracks. It was beautiful.

Anyway, I did my fan shroud the same way but with 1/8" black ABS; it is very easy to fabricate with.
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Old 03-23-2009, 11:27 PM   #20
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Quote:
Originally Posted by ftjandra View Post
Just run a strip of weather stripping down the center between the fans. That'll seperate your shroud into individual cavities.

--Ferdi
+1
If you can't see the problem, then you don't really know what you are looking for.
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