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Old 10-04-2012, 12:54 PM   #1
JTripper
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Alternator air duct importance?

How important is that air duct to the alternator?
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Old 10-04-2012, 12:55 PM   #2
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pretty important considering it was put there.
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Old 10-04-2012, 01:02 PM   #3
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OK my fav cousin einstien I too came to that conclusion.... aside from that fact I was looking for more of a technical answer. I've never had a car (out of 8+ in my lifetime) that had such a setup! I was just wondering WHY?
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Old 10-04-2012, 01:04 PM   #4
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Why do you think
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Old 10-04-2012, 01:15 PM   #5
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OK my fav cousin einstien I too came to that conclusion.... aside from that fact I was looking for more of a technical answer. I've never had a car (out of 8+ in my lifetime) that had such a setup! I was just wondering WHY?
Have you seen how tight the engine compartment is? There's a lot in there. There's a whole lot of heat soak.

Mine does not have this duct. I do not know why. Maybe they changed to cooler alternators later.
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Old 10-04-2012, 01:19 PM   #6
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Just buy the duct for it. If you don't have it buy the two elbow pieces and the brake duct that has the hole for it.
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Old 10-04-2012, 01:28 PM   #7
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Duct bought..
I just had to further satisfy my curiosity!
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Old 10-04-2012, 01:34 PM   #8
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bmw probably found that during testing, their temperature probes on the alternator showed to be too hot. why not direct air into it. voila.
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Old 10-04-2012, 01:40 PM   #9
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How important is that air duct to the alternator?
On a scale of 1 to 10, 10 being very important, it's about a 2 or 3.
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Old 10-04-2012, 01:45 PM   #10
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Have you seen how tight the engine compartment is? There's a lot in there. There's a whole lot of heat soak.

Mine does not have this duct. I do not know why. Maybe they changed to cooler alternators later.
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Originally Posted by Solidjake View Post
Just buy the duct for it. If you don't have it buy the two elbow pieces and the brake duct that has the hole for it.
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Originally Posted by jdstrickland View Post
On a scale of 1 to 10, 10 being very important, it's about a 2 or 3.
I like that answer....
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Old 10-04-2012, 01:47 PM   #11
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bmw probably found that during testing, their temperature probes on the alternator showed to be too hot. why not direct air into it. voila.
LOL @ VOILA!
now yuh talking patnah
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Old 10-04-2012, 02:01 PM   #12
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It's actually rather beneficial and important. There are a few posts where people removed it and alternator died in high demand cars. I know the Technik ASA supercharged cars because of piping left this off. Several owners noticed their alternators died soon after. So a reroute and ducting of cool air back as originally designed by BMW was done.
It's often not noticed how important some designs are until when removed the difference they make.
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Old 10-04-2012, 02:09 PM   #13
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It's important mine died cause it was missing. And plus why do you think there are water cooled alternators? High demand means high temps, high temps mean shortened life span, so keep it cool and lengthen life span.

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Old 10-04-2012, 02:20 PM   #14
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I replaced a duct that had a huge hole in it, and the alternator was good for a long time when the hole was there.

Obviously it helps keep the alternator cool, but it is not a fatal event for the duct to be missing or have a hole in it.
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Old 10-04-2012, 02:27 PM   #15
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How important is that air duct to the alternator?
I guess its there to improve access to cool air flow? However the word "cool" has to be taken in the context of ambient temperature. If you lived near the North Pole you would probably be looking to block up every orifice to keep the heat in. Well, to a certain extent. At the equator the opposite. So its difficult to say really.
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Old 10-04-2012, 02:29 PM   #16
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On a scale of 1 to 10, 10 being very important, it's about a 2 or 3.
I very much disagree.
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Old 10-04-2012, 02:36 PM   #17
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On a scale of 1 to 10, 10 being very important, it's about a 2 or 3.
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I very much disagree.
x2
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Old 10-04-2012, 02:40 PM   #18
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If you remove it, your alternator might overheat and start a fire.

When the insurance company looks at the car, they will deny your claim because you removed the duct.
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Old 10-04-2012, 02:46 PM   #19
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The E39 V8 has water-cooled alternator.
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Old 10-04-2012, 02:51 PM   #20
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And they are expensive as ****.
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