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Join Date: Feb 2007
Location: Taipei, Taiwan
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A/C condenser fan -- which way is better
My '87 Targa has an electric fan attached underside the rear A/C condenser blowing air through and out the whaletail. I'm wondering if the fan turns reverse and sucks air in through the condenser it would probably not cool the condenser as well but would help draw in more air to cool the engine instead of obstructing the airway and deprived the 11-blade fan of the air it needs to blow into the shroud. Any one would comment on this, thanks!
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05-21-2007, 04:15 PM
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Better to go in than out.
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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05-21-2007, 04:24 PM
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>>>Better to go in than out.<<<
Agreed. The fan blowing "out" would be pushing air against the pressure created by the tail. You want it to pull in. TonyG
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LSx 951 with 997 Cup Suspension - vision944.tonygarcia.org 3.6L 911SC - www.tonygarcia.org/911SC Last edited by TonyG; 05-21-2007 at 05:16 PM.. |
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05-21-2007, 04:40 PM
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Some fan design to switch the wire to do reverse. I just install mine above the condensor, inside the tail, to pull air from outside. I think another option you have is to turn it upside down and install it on top of the condensor to blow air into the engine bay.
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Fat butt 911, 1987 |
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05-21-2007, 04:48 PM
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Blowing out effectively doubles the airflow through the condenser. What goes out has to come in. As far as aerodynamics, if you're going fast enough for your whale tail to really work why do you have your A/C on? Also, if you’re still concerned remember that blowing out produces downward thrust and a vacuum under the car, both greatly improve cornering. (Seriously, which way the fan blows has nothing to do with handling!)
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05-21-2007, 05:46 PM
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Thanks all!
Now I feel more peace in mind to reverse the flow direction. The temperature gauge will probably tell if this is the right way to do it.
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'87 3.2 Targa |
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05-22-2007, 12:27 AM
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Hladun has enough to make me think and doubt that sucking in is better. Just have to hear from alniki experience after you swaped. Please post result.
Thanks.
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Fat butt 911, 1987 |
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05-22-2007, 08:48 PM
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Quote: 'if you're going fast enough for your whale tail to really work why do you have your A/C on?'
Hladun, did you mean having the A/C fan on? or what? Also, it's usually during a slow drive through traffic when one feels the need for better cooling at the A/C condenser. The point seems to be if there is restriction of air flow at the consdenser which is partially obstructed by the fan if it's blowing outwards. And this would be important if the air supply to the 11-blade fan can only go through the condenser. BTW, I occasionally noticed some turbulance sound from the rear, which probably resulted from the condenser fan struggling to blow against the inflow wind from outside the whaletail.
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'87 3.2 Targa |
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05-23-2007, 05:26 AM
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