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 Post subject: Fan pulling through resistance make unavodable bad noise?
PostPosted: Thu Dec 10, 2015 10:05 pm 
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Joined: Fri Nov 20, 2015 3:32 pm
Posts: 69
I recently tried to add a pull fan(ty147a) to my macho hr 02 and the pull fan make significant worst sound in quality and quantity compare to the push fan.
at low rpm (below 500) it is rather indistinguishable , but once rpm go higher, it easily surpassed the other fan.

Also, pulling through grill/mesh with most fan seem to sound worse than pushing.
Is this a problem specify with my heatsink, or something universal? Or it is the distance that matter? As push tend to be further away from the object for a little bit.


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 Post subject: Re: Fan pulling through resistance make unavodable bad noise
PostPosted: Fri Dec 11, 2015 12:59 am 
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Joined: Wed Jun 13, 2007 10:12 am
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Location: ITALY
Part of your problem is that the pull fan may actually spin faster (slightly) than the push one (it is "accelerated" by the flow coming from the push fan itself).

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 Post subject: Re: Fan pulling through resistance make unavodable bad noise
PostPosted: Fri Dec 11, 2015 8:49 pm 
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baii wrote:
I recently tried to add a pull fan(ty147a) to my macho hr 02...

can i ask what the high temps and highest rps were? i.e what made you want a second fan?

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 Post subject: Re: Fan pulling through resistance make unavodable bad noise
PostPosted: Sat Dec 12, 2015 3:49 pm 
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Joined: Fri Nov 20, 2015 3:32 pm
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For the sake of tinkering.

Turn out it is just that way when a fan pull from the heatsink, no matter front or back.
It is back to one fan now.


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 Post subject: Re: Fan pulling through resistance make unavodable bad noise
PostPosted: Wed Dec 16, 2015 11:23 am 
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Joined: Wed Jul 22, 2015 3:17 am
Posts: 45
One of us must be the bad penny. We keep running into each other :D

I had a play with my Macho and below 850rpm I can run 2x fans in push / pull. Got called back back by SWMBO before could do more. Will try to remember and check it out more when I get time.


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