80mm to 60mm Adapter

[BOBRO57]

Any one out there know where I can purchase one of these. Prefer aluminum instead of plastic. The coolerguys have the plastic one. Overclockers Hideout is out of stock.:(

[dimmreaper]

You could make one out of a beer can or two . . . .

[Mr.Lansing]

i live in Hong Kong and it'z like 25 US for one which i think is a SUPER rip-off but is the performance alot better afta using it?

[dimmreaper]

Mr. Lansing-

Typically adapting an 80mm fan to a 60mm heatsink does not provide the expected result. Temps in all likelyhood will increase a degree or two(assuming the 80mm fan has only a little more airflow) , but the system will be much quieter.

The reason for this comes down to the fact that all fandapters currently on the market are poorly designed. They do not taper gradually enough, and there are no walls within the funnel to provent the the air from cycloning. When the air cyclones it pushes outward against the funnel and tries to climb back out. The result is similar to what happens when you drop a marble in a funnel, the marble circles several times before falling out the bottom. But in this case you want the marble(air) to imediately drop out the bottom, so you need to put walls on a verticle plane to stop the cyclone effect.

[JetMech]

Originally posted by Mr. Lansing
i live in Hong Kong and it'z like 25 US for one which i think is a SUPER rip-off but is the performance alot better afta using it? I read a review last week that showed a loss of flow due to turbulence cause by the lack of a smooth transition from 80 to 60 and into the heatsink. The units tested were both made of plastic. What I am curious about is the affect of using Bernulles principle to flow air into the heatsink. It would work like air going into a carburator. The intake and exhaust are larger than the center. Is there a mechanical engineer in the house that can work this out mentally without me having to trial and error it? The idea is to ram the air into the heatsink. If my thinking is right you wouldn't need huge loud fans to increase cfm.

[CrystalMethod]

Well, if we're bringing in the car intake/airflow thingy. You could modify one and add a plenum(<--- SP?). Some high performance intakes have them toi smooth out the airflow going into the head/s. I don't see why it wouldn't work with a fan adapter. I think the trick is to, as close as possible, to flow the rated output of the fan to the heatsink. What fans are rated at, and what really hits your heatsink, are completely different.

[dimmreaper]

Another note: fandapters expirience a sudden preasure drop behind the fan motor, a small solid cone on the back of the motor might increase the fandapters airflow marginally.

[Mr.Lansing]

Originally posted by dimmreaper
Mr. Lansing-

Typically adapting an 80mm fan to a 60mm heatsink does not provide the expected result. Temps in all likelyhood will increase a degree or two(assuming the 80mm fan has only a little more airflow) , but the system will be much quieter.

The reason for this comes down to the fact that all fandapters currently on the market are poorly designed. They do not taper gradually enough, and there are no walls within the funnel to provent the the air from cycloning. When the air cyclones it pushes outward against the funnel and tries to climb back out. The result is similar to what happens when you drop a marble in a funnel, the marble circles several times before falling out the bottom. But in this case you want the marble(air) to imediately drop out the bottom, so you need to put walls on a verticle plane to stop the cyclone effect.

thx for the advice!:D