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modifying fans

post #1 of 5
Thread Starter 
I was wondering if anyone had ever tried to fill in the small void in fans between the blades and the housing?
I'm thinking of trying it on a Delta AFB1212SHE fan(I have two of them, one in use, and one that'll be on an evap chiller). The reason I want to do this is to up airflow at lower rpm while still maintaining the good volume(noise levels for a 24/7 comp) and still having the ability to crank them up for more volume when needed.
I'm currently running speedfan to control the fan temps, but I've noticed that I get a back blast type of effect from the fan routinely, and I want to direct the air through the radiator instead of back into the case.
My current setup is the fan mounted inside the cae pushing out through an fan housing(gutted after the bearing seized) and then the thermaltake radiator(I know, there are better and I'm planning on replacing it, but want to get other upgrades as well).
Thanks.
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post #2 of 5
I havent tried something like that before. If it works or not, take some pics and let us know how it turns out. You may also check in the case mod section - some of those guys do some extreme mods and may be able to help ya.
post #3 of 5
Pull might work better than push.
post #4 of 5
Thread Starter 
Picked up a roll of masking tape to try this with.
T-Ramp, I tried it in pull, but it made too much noise(the rad is acting like a sound dampner) and running the wires out the back of the case was a real PITA. I'll take pictures as I go and keeps tabs on both the idle temps and full load temps, both at full RPM and 40%(can't even hear the fan down there). Full load will be with Prime 95, and I will wait to see where the temps level off at, as well as if it seems like some of the backblast is gone. I'll let you know the results.
Time to get started.
Quick edit, I'll try the differences in pull as well with the rad mounted remote from the back of the case. First though, time to put in a 500 watt Coolmax PSU that I just picked up today in place of my old 300 watt one that the fan just quit on. At least I was already planning to swap it because the fan was starting to make noises.
Edited by Straick - 3/11/11 at 5:09pm
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post #5 of 5
Thread Starter 
The results are in, and they were interesting. I'll have to try this again later after I get a better radiator(Thermaltake right now) and reseat using AS5 instead of some cheap stuff I had. The Delta fan that I'm running in push gave an idle temp of 32(cpu)/28 at 50%(fan speed). Full load of 46/30. Shimmed, it gave 30/27 idle and 45/30 load. Pull at 50% was 32/28 idle, 47/32 load. Shimmed it was 33/29 idle and 45/32 load.
At 100%, the results were(Push stock), 31/26 idle, 43/28 load and shimmed gave me 30/26 idle and 42/28 load. Running pull, stock gave me 31/27 idle and 46/30 load. Once shimmed, I got 32/28 idle and 45/30 load.
At 75%, the results followed the same lines, the cpu ended up 1 degree less after being shimmed.
However, the masking tape I was going to use didn't want to stick to the fan housing, so I had to use electrical tape instead, and it actually started to peel and rub shortly after I was done testing this out.
I also discovered another nice thing during testing, I can run this fan down to 20%(completely silent turning 1000rpm) and the CPU temp stays below 35 and the gpu stays below 33 while playing movies.
The part I find interesting is that this fan actually performed better in a push configuration, but I also have the radiator shimmed back form the case 24mm with an old fan housing(cut the guts of it out).

Here's some pics of the testing setup.


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