Fans for a BIX

ewarz

[H]ard|Gawd
Joined
Dec 13, 2002
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I was about to buy some near silent 120mm fans for my BIX2 when noticed some people saying that "certain fans are not good for a BIX"

did i misunderstand something or is this true? how can some fans not be the best choice for this rad?

i am looking for the most quiet fans possible.
 
bip = good performance with low cfm fans

bix = best performance overall but needs high cfm fans

you need like 70+cfms to make it better than a bip ...

that's why i use a bip3 with 5 volted yate loons slows

good fan for a bix would probably be 120x35mm like panaflo m1a or a delta

mal
 
I think it's because with some radiators you need more CFM's to get through the fins to cool the fluid better. With BIPro II you can use quieter fans.
 
thanks for clearing it up for me. since silence is my main goal and priority here, it seems that i made the wrong choice with the rad. however, i guess i will need to make due and deal with it.

malicious, thanks for the panaflo and delta suggestions. ill look into them and see what will work for me.


another question since we are on the subject, does this rad need a shroud?


EDIT: spelling.
 
ewarz said:
thanks for clearing it up for me. since silence is my main goal and priority here, it seems that i made the wrong choice with the rad. however, i guess i will need to make due and deal with it.

malicious, thanks for the panaflo and delta suggestions. ill look into them and see what will work for me.


another question since we are on the subject, does this rad need a shroud?


EDIT: spelling.

For a BIX you will need fans with a high h2o preasure. High cfm means nothing if there is no preasure to back it up. The 38mm panaflo is a good suggestion but 2 sanyo denkis are the best of the best.They have massive preasure and high cfm at 12v for oc'n/benching/gaming and are dead silent at 5v for the relaxing times. They cold start at 5v aswell which is handy. I hope he doesnt mind but j-mag is the guy to talk to for them. You can find him at XS and here (i think). If you get them, take a hair dryer to the back of them and carefully remove the sticker and then drop down the shaft some nice mineral oil lube (not graphite) then heat the sticker and replace; it works wonders on the silent front (><)

Yes you need a shroud. 1/4 of an inch is uterly useless for a standard 38mm fan. It will be noisy as all shite and have a huge dead spot from the fan hub so the airflow will be very unfairly hindered. Bottom line get a shroud.

EDIT:

as to answer your original question as to why some fans are bad for this rad it is because HWlabs on thier BIX (and BIP grrrrrrr) use a stupidly high fpi (fold/s per inch) and relative rad thickness so as to get more surface area. Indoing so they make the rad extremely restictive hence the requirement the fans to have a high h2o displacement preasure. There are many 28/38mm fans that people buy with out realzing that they have very low preasure because thier cfm looks impressive on paper. They then wonder why they get good idle temps and horrendus loads...not enough air going thru the rad.
 
good info on the 5v starts... didnt know that... i thought most good 120s needed 7v to start...

hmm... maybe ill get some for my loop :)


do you know do they do well with PWM fan controllers? or do they get bearing rattle?
 
yeah great info. the sanyo sounds like the way to go. i wish i had asked this question before i got this rad. oh well, it just means im going to have to work harder at sound proofing
 
ewarz said:
yeah great info. the sanyo sounds like the way to go. i wish i had asked this question before i got this rad. oh well, it just means im going to have to work harder at sound proofing


bro just sell it on the forum and pick up a bip2 or 3 for like 30 bucks if you don't want it ... the peeps going for max performance will take it..

i personally LOVE my bip3
 
I put 4 TT 120x25 78cfm @2000 RPM fans on my BIX-II in a push pull arrangement. Works great and the fans are 5 bucks each, so 4 fans for the cost of one SilentX.

Usually I run these at around 7 V unless gaming or overclocking. Moves a ton of air with all 4 fans on full speed, and not that noisy. They are connected to a Sunbeam Rheobus. They take a bit under 7 V to turn on but once on the voltage can be backed off to well below 5 to where they are barely moving.

-- Rev

coolingunitkb4.jpg
 
Adidas4275 said:
good info on the 5v starts... didnt know that... i thought most good 120s needed 7v to start...

hmm... maybe ill get some for my loop :)


do you know do they do well with PWM fan controllers? or do they get bearing rattle?

Sorry bout the late reply i had a particually nasty exam.

I specifically built my self a nice linear volt reg that could handle a junk load of sanyo's so i would never have to find out about the bearing rattle. I would put my money on the pwm haveing some problems starting the sanyos at low voltage anyway.
Actually i know this sounds counter intuitive but i think for powerful fans the linear volt reg is a more elegant soln. The sanyos use 0.52 amps @12v which equates to 6.24w per fan. Most off-the-shelf-built-for-pc-enthusiasts pwn based controlers when you read the fin print can only handle around that amount on each channel. So alot of u would probly have to rig one fan per channel as to not blow ur controler. Whereas with the linear volt reg you can chose a chip that can handle upwards of 30w on its own and then you shweet to have all the fans on ur rad (i have 3 on my pa120.3) on the one controler so they can be turned down at the same time :)

yes i was supprised to see they could start at 5v's to (><)
Mind if you wanna turn them down that far just make sure that you gasket ur rad to ur shroud and ur shroud to your fans so as to harness every bit of preasure/air you can thru ur rad. Other wise they may not be very much air passing thru the rad lol.
 
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