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Old 08-16-2008, 03:44 PM   #41
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I bought my fans on ebay from these guys. Shipped it out the next day. Best price I saw for 2 fans shipped. I paid $54.17 including 2 fans and shipping.
Might be better out there but it seemed pretty good and they got it out in less than 24 hours.

http://stores.ebay.com/abad71camaro
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Old 08-16-2008, 03:53 PM   #42
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thinking out loud here... the fan is a resistance to air flow when the car is moving. in that case, perhaps the smaller diameter fan will increase the car's ability to flow air through the rad and out the extraction vent while driving. if the previous is true, then it would be true that the smaller fan is in all ways better.

Roar believes it to be true...

The fan is resistance possibly the way that car is set up with air directly channeled to the radiator. With most cars I have to agree with the video about the shroud for the 2/3 cobra on the 1st page. Most of our cars have the IC in front. Those with AC have the IC and AC in front of the rad. Even at high speeds air isn't moving very fast or smoothly by the time it reaches the radiator. Add in any back pressure in the engine bay and I don't think enough air is being forced through the rad for the fan to be a source of resistance.
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Old 08-16-2008, 04:35 PM   #43
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has anyone thought about putting little flapper door thingies on the shroud like VW does to let air pass through the shroud, then shut when the fans come on? Its going to be nice to put these theories to bed when I start working on my cooling disaster.
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Old 08-16-2008, 04:42 PM   #44
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you could always straighten the air going into the head exchangers:
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Old 08-16-2008, 05:10 PM   #45
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how did you get the stock shroud to mount so shallow? I have the "coolradiator.com" aluminum rad, and hopefully mine will fit between the sway bar brace.

?? bolted right up i dunno...the motor doesnt stick out really far is all now.
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Old 08-16-2008, 05:21 PM   #46
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?? bolted right up i dunno...the motor doesnt stick out really far is all now.
sway bar distance.
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Old 08-16-2008, 08:37 PM   #47
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i have a coolraditor.com rad, as you can see no issues...it was the 2" one, not the 3"
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Old 08-17-2008, 12:31 AM   #48
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A/C fan done.


Here's some actual real magnehelic gauge testing data I found:

Both fans raise the atmosphere .25 ~h2o when running. Both drop it .25 just in front of blades, obviously.

I was able to have the a/c fan drop it .50 inches of water in a certain sweet spot, but alas I couldn't find a spot on the other side where it would increase that much.

I do need the 12" to fully utilize the shrouding...toward the outside edge of the cooling fan, it tends not to raise the pressure as much, obviously due to the size in the shroud. the a/c side raises it evenly across the entire opening.


Now I need to test the same with stock fans mounted.

So in someone wanted to use this as an example, buy a 12" for the cooling fan and 10" for the a/c.

you can also see in my picture with a 2" radiator, i don't have much wiggle room with a 7/8" solid bar.


Why not 2 12" fans?
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Old 08-17-2008, 12:59 AM   #49
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^A 12" fan will not fit in the factory AC fan-shroud.

I posted earlier that a very clean and functional upgrade to the stock fan system would be to source a second main-fan housing from salvage and run 2x12's in side-by-side stock main-housings. It would be completely stealth and provde XX% more airflow (exact number still pending). I am catalogging little stuff like this... may be a super-cheap solution to a common hi-power Miata problem.

Guys like me who disdain the stock black plastic nose-funneler and undertray would love this mod if it's enough of a jump in efficiency.
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Old 08-17-2008, 01:06 AM   #50
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Old 08-17-2008, 09:50 AM   #51
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I posted earlier that a very clean and functional upgrade to the stock fan system would be to source a second main-fan housing from salvage and run 2x12's in side-by-side stock main-housings.
Is fitment theoretical or proven fact?
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Old 08-17-2008, 10:18 AM   #52
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second main housing would not fit...that's why there is a 12" and 10" from the factory.
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Old 08-17-2008, 11:02 AM   #53
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that's what I assumed, just checking
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Old 08-17-2008, 11:28 AM   #54
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Really? Is the AC that much smaller? I assumed the housings themselves were the same size just with a smaller fan/shroud in the middle of the AC.

My bad for assuming. 2x12's would appear to be the ticket though for fitment using the plexi-method.

Are the NA/NB stock fan assemblies and mounting tabs the same? Anybody?
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Old 08-17-2008, 12:51 PM   #55
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did you not see my pictures?


A/C Fan Shroud with 10" ebay fan:

Name:  081508_16581.jpg
Views: 4
Size:  75.0 KB


Cooling Fan Shroud with 10" ebay fan:

Name:  081508_08361.jpg
Views: 4
Size:  71.4 KB


from tip to tip the stock fans measure in at 12.5" and 11"
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Old 08-17-2008, 02:07 PM   #56
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Quote:
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My bad for assuming. 2x12's would appear to be the ticket though for fitment using the plexi-method.
Or just mounted directly to the radiator. Cjernigan is running a 2x12" setup on his oversized radiator, Godspeed I think. I am running 2x11" Spals on the stock radiator and it works fine. No overheating, daily driven, South Texas heat. In other words, you may not need to bother with the lexan shroud.
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Old 08-17-2008, 03:05 PM   #57
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^But plexi is baller... unless it's mounted to your rollbar and houses Pioneer 6x9's.
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Old 08-17-2008, 03:35 PM   #58
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someone should just trade me a 12" fan for my 10" fan and be done with it
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Old 08-17-2008, 05:24 PM   #59
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someone should just trade me a 12" fan for my 10" fan and be done with it
you know you want to.
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Old 08-17-2008, 07:16 PM   #60
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this **** is bananas
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