Installed Blow Hole

[DodgeViper]

I installed a blow hole tonight in my tower and gained 1c in my case temp's. Currently I have,

1-50 cfm 80mm Sunon front mounted. Pulling
1-50 cfm 80mm Sunon rear mounted. Venting
1-50 cfm 80mm Sunon top mounted. Venting

Below are the reading I am getting with this set up. I think the top fan has got to go. It's just to dam loud to only gain 1c.--Sensor Chip Readings--

Temperature Readout[1] : 23 Primary
Temperature Readout[2] : 23 CPU
Temperature Readout[3] : 22 Case

Voltage Readout[1] : 1.5583595890411
Voltage Readout[2] : 0.394917808219178
Voltage Readout[3] : 3.46836377473364
Voltage Readout[4] : 5.03500761035008
Voltage Readout[5] : 12.0840182648402
Fan Readout[1] : 7500

[Sonny]

Hopefully the readings are accurate. How about trying an euqal amount of intake & exhaust CFM? Maybe a little clean up inside the case will help too.

[RedDeathDrinker]

My blowhole (and duct onto heatsink fan) dropped me 4 degrees C..........

PSU mod (see article here) dropped me another 4 C.......

[The Overclocker]

try evening out the air flow. another point to remember next time you are doing something like this bigger is better, 120mm fans are slower and quiter but blow more air

[Thermal]

Cut a 120mm on the left panel, slightly below the HSF, you will notice a huge differance.:cool:

[pogue1000]

Originally posted by Thermal
Cut a 120mm on the left panel, slightly below the HSF, you will notice a huge differance.:cool:

this may sound silly. but would that 120mm be a intake or exhaust.. i am thinking bout doing that.

[Thermal]

Originally posted by pogue1000


this may sound silly. but would that 120mm be a intake or exhaust.. i am thinking bout doing that.

~Intake.

[DodgeViper]

The temps above were for a old AMD750. The new temps are what took place today after rebuilding the computer. I took the blow hole fan and have it blowing on the CPU. Sandra Burn-in has now been running for nearly 2 hours.

AMD 1.4 AYHJA @1587
MOTHERBOARD: AK31 REV3.1
OS: 98se
CPU volts 1.89
+5.00v: 4.87v
+3.3v: 3.34v
+12.00v: 12.28
CPU VCORE +0.100V
CPU RATIO 11.5
DDR VOLTS 2.70
CPU CLOCK 138
TEMPS IDLED: System 29c CPU 36c
TEMPS LOADED: System 30c CPU 38c
CPU COOLING Alpha 8045 EXTREMELY POLISHED
http://teamajo.com/BMX_LINKS/FIREWALL/P0001067.jpg
CASE: FRONT INTAKE 50cfm 80mm Sunon
CASE: REAR EXHAUST 50 cfm 80mm Sunon
CASE: TOP INTAKE 50 cfm 80mm Sunon
POWER SUPPLY 300w Channel Well (needs to be replaced)
CD BURNER: HP 8100i
CD ROM: 48X Toshiba
SOUND: SB Live Drive Platinum
MODEM: 56K USR
MEMORY: 2-256 DDR 2100 Crucial
VIDEO: Matrox G400 (needs to be replace)
HARDRIVE: 15G. IBM (needs to be replaced)
CASE: Enlight 7237 w/Blow Hole
FLOPPY: Sony

[Crazy Jayhawk]

Originally posted by reddeathdrinker
My blowhole (and duct onto heatsink fan) dropped me 4 degrees C..........

PSU mod (see article here) dropped me another 4 C....... Which article?

[vayero]

Here is my experience on this:

I have a full tower case with places for 3 80mm fans, one in the front bottom and two in the rear top. These places were of the "many little holes in the chassis" variety, so the first mod i did was to cut the supposed grills and free a lot of airflow. Then I cut the plastic in front of the case because it was blocking a lot of air too. I installed one Sunon 80mm/40cfm in the front bottom for intake and two Sunon 80mm/30cfm in the rear top for exhaust.

Then, I cut two holes in the left side panel, well below the cpu fan (I did this because my cpu fan blows toward the hs and airflow from behind made it work in higher rpm) and installed there two Sunon 92mm/50cfm for intake. I cut another hole in the right side panel, about 2 cm from the rear of the cdroms and 5 cm from the top of the case (side-blowhole?) and installed another 92mm/50cfm for exhaust.

I calculated 40+50+50 = 140cfm intake and 50+30+30+30 (psu fan) = 140cfm. So I thought I was ok. I even replaced the YSTech 60mm/26cfm on my hsf (Globalwin WBK) with a Sunon 80mm/40cfm (I did this using a normal steel grill between the fan and the hs and mounting the springs on the grill).

Result: about 16C drop in full load (from 67C to 51C). These measurements are not that accurate, though, because when I started the mods was early October with about 25C ambient temp and now its about 22C with central heating on :) The mob temp is max 2C higher than ambient at full load.

I have a slight (or big, it depends on the way you see it ;))problem though: the 3 top fans, (2x30 + 1x50 cfm) draw so much air that the psu fan can't work properly! Instead of exhausting air it's pulling in! (Tip: a cigarette lighter is the best tool for checking airflow). Of cource, that means that I am short-circuiting air in the top of the case but I don't think that all this air (110cfm) is coming only from the psu fan hole, some of it must be coming from below too. Then again, my cfm calculations go down the drain :( Maybe I'll change the psu fan with a stronger one and see, or I'll seal all the little holes in the case that could possibly hinder airflow, I don't know. Oh, I forgot to mention, my system now is realy LOUD! Not so much from fan noise, but from air-movement noise and chassis vibrations (I have some thoughts on that, I'll process them and post them here).

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Athlon 1.4@1.575 (11.5x137) on ASUS A7V266
256MB Kingston DDR @CAS2
Creative GeForce2MX DDR
20GB WD200BB
Hitachi 2500BX DVD
Plextor 2410A CDRW f/w 1.02
M/b integrated C-Media 6ch sound card (has anyone made this chip's 6 channels work? I think it sucks...)
Huyndai F910 19" monitor