90mm & 80mm to 60mm fan adapters

[Pitspawn]

Recently i've seen these fantastic simple devices on sale that let you push air down 80mm/90mm and even a godamned 120mm fans to a 60mm heatsink. I want to know if these are overall better than 60mm fans.

I have a 7.2k delta fan but do not use it because of the insane noise & vibration levels. Would an adapter with an 80/90mm fan reduce sound and vibrations but still keep a good cfm going?

And has anyone actually tried out one of these adapters yet? They are pretty cheap for what they are atm.

ThermoEngine w/ Taisol 23cfm 5.5k fan IDLE ... 31°C MAX ... 39°C
ThermoEngine w/ Delta 37cfm 7.2k fan IDLE ... 30°C MAX ... 33°C

As you can see there is a massive difference. But the sound and vibration levels are at least twice with the delta fan.
Another thing is that my delta fan doesnt quite fit my ThermoEngine. How can I rectify this weird problem?

[klosters64a]

Because of the difference in air pressure and the speed of the air moving over the HS, loss of net cooling power seems to be pandemic when changing from a 60mm to a larger fan with an adapter. AFAIK, you need to replace the stock 60mm with a larger fan that's much more powerful. For example, a 42.5 cfm 80mm gives you a drop in cooling. But a monster ? cfm Delta 80mm holds its own.

Even so, you lose the maddening scream of the Delta 38.

I've read that replacing a 60mm that draws air UP through the HS, a la PEP-66, with an 80mm+ fan on an adapter doesn't incur a loss of cooling power. Dunno if this is so, or not.

[sifu quoc]

i put an 80mm on my pep66 for a while... the 80mm was a 47cfm panaflo... when i run it at 12v, it was a lil quieter than the delta, but was about the same performance as when i ran the delta at 7v... i think thats what i remember... now i run my delta at 7v

[Pitspawn]

Is there an article on how to put the 7.2k Delta from 12v down to 7v?
Oh and how do i get round the problem that the Delta fan doesn't actually screw onto the ThermoEngine right? ATM one screw goes 90% way in and the rest are like 50%-70% way in. Would rubber spacers do the job?

[It_The_Cow]

Try this (http://www.fanbus.com). It's under the Fan Switching FAQ in the lab