Everyone on this forum should make a duct, 10*C - 12*C drop!!!

[Nico|ARG]

I dont think those xoxide adaptors would work as well as this duct mod. I mean, if u have a 80mm fan then i m sure it d work just as fine but if u have a 92mm then it itsnt. Look at this pic.

Can u see how the 92mm tornado excels (is that the word?) the slk?. If u use a 92 to 80 mm adaptor there d still be air going outside the slk, but if u use a 92 to 70 i dont think u d have any problem.
There in the US u can get anything premade, at really low prices. Here in Argentina the only adaptor we can get is a 80 to 60mm and at 10 12us, plus with the current devaluation for us is like it cost 35$, would u spend 35us in a fan adaptor?
There s where the magic of the voodomelon duct mod is . TNX MAN!! I m gonna give it a try tomorrow, everything is closed right now.

 

[Hookj5]

This might be a stupid question but here goes, Right next to the cpu I have 2 case fans exhausting, should i have the heatsink fan blowing on the SLK or pulling air through it and toward the exhaust fans? the 2 exhaust fans don't line up exactly, they are a little lower down, like 2 or 3 inches. any input?

 

[voodoomelon]

Exactley what I was thinking Nico|ARG. If you duct from 92mm to 80mm, your gonna have loads of wasted air still not reaching the center of the heatsink. So you might aswell have just an 80mm fan. Try the mod before buying, go on.

 

[voodoomelon]

No Hook, defintely keep it blowing down, you can't beat 119CFM blowing down on the heatsink. It's much more effective than sucking air away.

 

[Nico|ARG]

This might be a stupid question but here goes, Right next to the cpu I have 2 case fans exhausting, should i have the heatsink fan blowing on the SLK or pulling air through it and toward the exhaust fans? the 2 exhaust fans don't line up exactly, they are a little lower down, like 2 or 3 inches. any input?

Like voodomelon said, is better to have the tornado blowing in than out. I used to have a duron cooler with the fan blowing out the air instead of in, and it did improve some degrees, so if u want u can give it a try, especially if u dont have a fan like a tornado.
But if u ask me, i prefer having it blowing in. And if u want u can do a double duct mod, having another fan blowing air besides the tornado, or maybe have 2 tornados blowing in
Here is a pic so u can see what i mean.

 

[broktusk]

i am tryin the duct mod that has the duct from the fan blowing air in from outside the case b/c i have been having problems lately with my computer overheating so i made a makeshift duct mod with cardboard

 

[broktusk]

ok i ram Prime95 on the settin that was most stress ful for 5 minutes and the cpu temperature rose from 40 to 45 is this good or bad for that ammount of time?

and also running prime 95 more stressful on cpu than quake 2 is?

 

[Nico|ARG]

It depends on wich cooler do u have and if u have some kind of oc.
About prime95 and quake, i suppose prime95 is far more stressful

 

[broktusk]

Well i got screwed when i ordered my cpu fan and didn't know it so i have no idea what cooling i got and my computer is not overclocked. BTW its a 70mm x 70mm cpu fan

 

[TheWesson]

couple of things here --

4-inch diameter clothesdryer duct fits pretty well onto 8-cm fans. I have an aluminum one. Clear plexiglass probably looks better though you will lose some air velocity where it's squared off.

don't bother trying to make ducts airtight around the CPU HS/fan; I've tried both ways a couple of times and it actually works a little better if it's not airtight.

The duct can't really help push air through the heatsink, is what it amounts to - I think - and you're better off letting the "extra" circulation do whatever it wants.

I think it'd be interesting if someone was able to come up with a way to duct air from the base of the heatsink while feeding air into the top. The only way to do this that I can think of (given the difficulty of fitting a duct to draw air from the heatsink base only) is to fit one exhaust duct entirely around the HS+fan and then a duct-in-a-duct to feed air from the case into the HS/fan at the top of the HS/fan.

Doing this would have the advantage of having the impedance (the heatsink with all its fins) between the two fans, which I have been told here could actually increase the overall airflow through the heatsink. (putting two fans inline does not much increase airflow otherwise - so I am told - and I am inclined to believe this from my own observations.)

I view ducting as a substitute for the brute-force means of having four or six case fans keeping the air to your HS/fan cool simply by moving tremendous quantities of air through the case.

theWesson

 

[Hookj5]

I am thinking that if I ran a duct from the heatsink fan to my case fan, which is right there in the side panel, and exausted the air that ran over the heatsink, it would keep the case temps down. Air warmed by the heatsink would be outside and the heatsink would get freah, non warmed air. Just a thought sence those side panel fans have to exhaust to keep my air flow plan. I might just scrap the current air flow plan and start from scratch. run a duct from the side pannel directly to the heatsink. I need to take pictures and let you guys give me suggestions.

 

[captain_sHiFTy]

hmm, i wonder how well this mod would work if you cut portions of a plastic/aluminum cone for the mod? kinda like those plastic ones they sell for like 20 bucks
or you think that the square design works better?

someone wanna try this?

i was just thinking like cut a cone so the larger round section is just big enough to attach the larger fan, and the base just big enough to attach to the round hs fan mount (if you have one)
2 tired to explain it much better than that

 

[kayl]

nice temps, i wish in australia it got to 0c outside, today it was 40oc and at the moment at 11pm at night its 30oc in the computer room, heat sucks unless you want to go to the beach

 

[Nico|ARG]

I am thinking that if I ran a duct from the heatsink fan to my case fan, which is right there in the side panel, and exausted the air that ran over the heatsink, it would keep the case temps down. Air warmed by the heatsink would be outside and the heatsink would get freah, non warmed air. Just a thought sence those side panel fans have to exhaust to keep my air flow plan. I might just scrap the current air flow plan and start from scratch. run a duct from the side pannel directly to the heatsink. I need to take pictures and let you guys give me suggestions.

Look at the pic i posted, is exactly what u are saying. Thats the way i m gonna do it

 

[voodoomelon]

at the moment at 11pm at night its 30oc in the computer room

My god, that's nuts. i'm sitting in a 17*C room now. Case temp is 19.6*C -> makes all the difference with this duct.

 

[TheWesson]

hmm, i wonder how well this mod would work if you cut portions of a plastic/aluminum cone for the mod? kinda like those plastic ones they sell for like 20 bucks
or you think that the square design works better?

someone wanna try this?

i was just thinking like cut a cone so the larger round section is just big enough to attach the larger fan, and the base just big enough to attach to the round hs fan mount (if you have one)
2 tired to explain it much better than that

You're suggesting tapering (at least part of) the duct like a cone to adapt from a larger diameter (the case fan) to a smaller diameter (the heatsink fan.) Tapering is good in general for airflow (as opposed to changing sizes and not tapering at all) and in fact it's best to taper as gradually as possible (over as long a distance as possible.) For complicated reasons tapering down (channel becomes narrower) works better than the opposite way (a diffuser.) Either way, a really sudden tapering (like a 1-inch deep "fan adapter" cone) doesn't work well. You might as well open up the sides of such a cone and in fact some fan adapters do just that.

The suggested duct tapering I found in a ventilation site was 18 degrees - as a maximum. That is a pretty shallow angle!

Maybe you could taper a coil, by tightening one end.

Could you do this in plexiglas? It seems to me you'd need a way to make the plexiglas pliable, either that or cut a lot of little odd-shaped sections.

anyhow, I guess the answer to your question is probably, "You can do that, but it won't help much unless it's a pretty long/tall cone." If you're adapting from 80mm to 60mm, for example, you'd want to taper down 1 cm on a side over the distance of 3 or 4 cm, minimum.

Round ducts should work slightly better than square ducts - for the same cross section - but probably not any difference you'd notice.

Making the air turn at a right-angle is a no-no. Might even be bad enough so you'd notice the difference in terms of CPU temp. Throw in some extra bits to make it into two 45-degree bends and you're fine ...

the wesson

 

[TheWesson]

I might just scrap the current air flow plan and start from scratch. run a duct from the side pannel directly to the heatsink. I need to take pictures and let you guys give me suggestions.

My reason for not making a duct from the CPU HS/fan to the side of the case is that that's the side I always open to get at things, so I can't really attach a duct to it, can I?

Make it a pretty stiff duct and bolt it to the door? Or attach the duct to the CPU HS/fan and then get it so it can't slip around or move? (put a bracket on the AGP card or PS?) I dunno.

So - Question: how are you going to secure it?

the wesson

 

[Cypress]

Least you don't live in Cairns, lowest you get in the middle of July(winter) is 21c (70 for us Americans). Quite nice if you ask me, but for a computer that's a smack in the face.

 

[Cypress]

oops, forgot my questionso here it is. Did you run a duct as in cut a hole in the side of the case and made a direct path for the air to take or did you put a bit of plexiglass/cardboard in between the fan and the HS? I'd imagine that #2 would get rid of the deadspot, the first one would help to get cooler air in.

 

[Twister1234]

hm,made a duct,to get rid of the deadspot,on my 92mm enermax with slk 900,my temps dropped from 43 C to 39-40 C running prime,at 200 fsb,not really high,but nice,think,geting real cold air,form outside,would be a nice extra(need to get some equipment,to do that...)