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post #11 of 34
Wouldn't this thread be better placed in the air-cooling forum rather than water-cooling?

I'm interested in the discussions here, but this was a fluke to find.
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post #12 of 34
A case can be made that it belongs in both.
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post #13 of 34
my guess on the loons, not quite enough

but, that is a very interesting way of testing, I didn't think about.

I haven't gotten bit with my panas because they are caged behind a grill at all times when on but I have been lashed at with the intel stock cooler, that was no fun. it drew blood!

+rep!
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post #14 of 34
Thread Starter 
OK, here are my results. Even though the SilverStone is a 110cfm fan, it's only 25mm and the much quieter and lower speed 86cfm Panaflo dominates regardless with it's 38mm thickness.



I'm thinking 38mm fans look better and better, now Scythe has some low speed 38mm fans, those might be the better choice for pressure over loons.??
    
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post #15 of 34
definitally get some scythe Ultras in there! I read that the low-speed scythes dont do well with tight fins, but as soon as you get to 2000-rpm + it gets great
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post #16 of 34
Thats why I like the 120x38mm on rads,that pressure scavenges air through the rad a lot better... These are pretty quiet from the couple of guys I've talked to using them..Pana 68.9CFM ..I don't know how many inches they pull..

These are my favorite..115cfm Panaflo-SVC..They pull around .66" of H20..

Thats a nice little set-up Martin and pretty accurate...
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post #17 of 34
As I'm learning in my post about four 60mmx38mm vs. 1 120mmx38mm, sound is the critical factor. Since the fans don't consume that much power, noise is the deciding factor.

Can you add a noise measurement?
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post #18 of 34
Thread Starter 
Quote:
Originally Posted by DavidNJ View Post
As I'm learning in my post about four 60mmx38mm vs. 1 120mmx38mm, sound is the critical factor. Since the fans don't consume that much power, noise is the deciding factor.

Can you add a noise measurement?
The trick with noise is testing when it's quiet, unfortuantely that only occurs in my house way after the kiddies bedtime. Also my static fan box is a bit like a speaker box in that it amplifies noise level. To be fair, I'd probably need to measure the ambient noise, then the fan on a radiator of some sort. I do have a sound level meter, nothing really fancy though.

I can tell you the 86cfm panaflo is much quieter than the 110cfm SilverStone..
    
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post #19 of 34
Quote:
Originally Posted by Martinm210 View Post
The trick with noise is testing when it's quiet, unfortuantely that only occurs in my house way after the kiddies bedtime. Also my static fan box is a bit like a speaker box in that it amplifies noise level. To be fair, I'd probably need to measure the ambient noise, then the fan on a radiator of some sort. I do have a sound level meter, nothing really fancy though.

I can tell you the 86cfm panaflo is much quieter than the 110cfm SilverStone..
It shouldn't matter that your box amplifies the noise. We're only looking at relative numbers anyway. But making sure the ambient is (near) the same would definitely be important. Just include both readings in your measurements.

GREAT work by the way; this thread is exactly what I was looking for. Add the noise measurement and you've read my mind!
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post #20 of 34
The radiator should be necessary or necessaily desired. Shrouds, radiators, baffles, filters, and sound deadening wraps will all affect noise. I am curious where on the fan the noise is emenating from and in waht directions. Is it induction noise, exhaust noise, motor noise? Is it out the air flow ports or radial? Does mounting the fan against the radiator muffle half the noise? Does putting it in a two stage muffle the other half? Does drawing more air through the fins in a radiator create more noise?

I am extremely interested to see a PQ curve for a radiator...actually I'd like to see a PA, GTX, BIX, and MCR. Coupled with even existing graphs of heat dissiaption with different fans, that should give an idea of the performance at different points on the curve.

With the PQ, we could figure out where we wanted to be for a given load. Then, we could pick a fan accordingly. Or way different options.

The other big questions is how radiators do at different temperature differentials between the water and ambient. As the water temperatures become closer to ambient, I imagine it the efficency of the transfer of heat to the fins becomes more critical. At 35-40C water, I imagine even a tube with fins may work. At 23-27, contact area may be very critical.

Ira's shroud tests seem to indicate the flow from his fans reduced air temps a bit. Could it be that very strong fans can cause an additional cooling from air velocity? Would this only affect restrictive radiators? Would a 'Stealth' GTS coupled to some 60dbA fans actually work best because air velocity would cause air temps to drop?

There a lot of things we don't know and follow old wives tales. And like most hot rodders, lots of things we do for looks, cost, or convienence that have nothing to do with performance.
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