80 to 120mm fan adapter inside case port?

  • Thread starter Thread starter Lordy
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Lordy

After a bit of Googling it looks like they are snake oil (or at least "suck
it and see") as far as CPU cooling goes. Would they improve airflow /reduce
noise when used on 80mm case side vents? Or is pressure as important here
too?
 
Lordy said:
After a bit of Googling it looks like they are snake oil (or at least "suck
it and see") as far as CPU cooling goes. Would they improve airflow /reduce
noise when used on 80mm case side vents? Or is pressure as important here
too?
Click to expand...

Might have some marginal value on an intake fan (acting as a plenum) but
pretty much snake oil for an exhaust fan.

Yes, pressure is a factor and the air is going 'the wrong way' for it.
Axial fans sling the air radially, not 'forward', but a fan reducer is
trying to force the air in the opposite direction as it narrows down.
 
Might have some marginal value on an intake fan (acting as a plenum)
but pretty much snake oil for an exhaust fan.
Click to expand...

Sorry in should have said "intake" rather than "vent".

I suspect a 80-120 adapter inside the case sidewall will mean the outside
air comes in a bit close to the motherboard? And should be a bit quieter at
the same throughput?

I guess I will have to suck it and see :)

Lordy
 
Lordy said:
Sorry in should have said "intake" rather than "vent".

I suspect a 80-120 adapter inside the case sidewall will mean the outside
air comes in a bit close to the motherboard? And should be a bit quieter at
the same throughput?

I guess I will have to suck it and see :)

Lordy
Click to expand...

If it's a case side wall you should have plenty of room to simply cut it
out to the 120mm fan mounting and use a wire grill.
 
If it's a case side wall you should have plenty of room to simply cut
it out to the 120mm fan mounting and use a wire grill.
Click to expand...

Unfortunately its one of those clear plastic jobs with a circular ring for
80mm fan. But if it wasnt, wouldnt using an adapter put the fan and the
outside air closer to the motherboard? Maybe the loss of volume inside the
case would negate any benefits? I'll soon be finding out ....
 
Unfortunately its one of those clear plastic jobs with a circular ring
for 80mm fan. But if it wasnt, wouldnt using an adapter put the fan
and the outside air closer to the motherboard? Maybe the loss of
volume inside the case would negate any benefits? I'll soon be finding
out ....
Click to expand...

I bought 2 adapters and two fans from Ebuyer (Total £6.21 inc shipping!)
This Fans are a bit noisy at 12V but I've heard worse. They spin up at 5V
though, quiet, and have a fair breeze too. A little bit of vibration
though.

Anyway, I fixed one adapter and fan inside the case (with some dampeners)
and got a case temp drop of 4 degrees C.

I'm tempted to pull out the 120 Panaflo I installed at the front of the
case, an replace with the other fan at 5V. They push much more air and cost
about 10 times less.
 
Lordy said:
I bought 2 adapters and two fans from Ebuyer (Total £6.21 inc shipping!)
This Fans are a bit noisy at 12V but I've heard worse. They spin up at 5V
though, quiet, and have a fair breeze too. A little bit of vibration
though.

Anyway, I fixed one adapter and fan inside the case (with some dampeners)
and got a case temp drop of 4 degrees C.

I'm tempted to pull out the 120 Panaflo I installed at the front of the
case, an replace with the other fan at 5V. They push much more air and cost
about 10 times less.
Click to expand...

Fans aren't spec'd to spin up with only 5 volt, even if they happen to when
new. Use 7 volts.
 
Fans aren't spec'd to spin up with only 5 volt, even if they happen to
when new. Use 7 volts.
Click to expand...

What will happen?? It seems to spin quite forcefully and it takes a fair
bit of effort to stop it turning.
 
What will happen if it doesn't spin up? Uh, it doesn't blow air.
Click to expand...

I'll leave it running for now and see how it goes. It's a side vent and my
case happens to positioned along the wall with that vent is facing me, so I
can always see it. And if it failed then the PC will still run and there is
plenty of time for temp alarms to kick in.

[Thinks] .. I'll give it one more listen at 7v :)
 
Lordy said:
What will happen if it doesn't spin up? Uh, it doesn't blow air.
Click to expand...

I'll leave it running for now and see how it goes. It's a side vent and my
case happens to positioned along the wall with that vent is facing me, so
I
can always see it. And if it failed then the PC will still run and there
is
plenty of time for temp alarms to kick in.

[Thinks] .. I'll give it one more listen at 7v :)
Click to expand...

My Lian Li has fan controllers and when I installed a TT SubZero TEC cooler
and it's PSU, the PSU can control fan speeds too. I had all my fans running
at medium speed (9v I think) at first and the front two 80mm didn't spin up
at all until I realized that the TT PSU was cutting the voltage down to
approx 5v. Funny thing, the top exhaust and the rear fan spun up fine. Once
I turned the case fans up to normal speed, everything was fine.

Ed
 
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