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-   -   Alternator air duct importance? (http://forum.e46fanatics.com/showthread.php?t=948640)

JTripper 10-04-2012 11:54 AM

Alternator air duct importance?
 
How important is that air duct to the alternator?

Mango 10-04-2012 11:55 AM

pretty important considering it was put there.

JTripper 10-04-2012 12:02 PM

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?

choxor 10-04-2012 12:04 PM

Why do you think

Zell 10-04-2012 12:15 PM

Quote:

Originally Posted by JTripper (Post 14787459)
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.

Solidjake 10-04-2012 12:19 PM

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.

JTripper 10-04-2012 12:28 PM

Duct bought..
I just had to further satisfy my curiosity!

Mango 10-04-2012 12:34 PM

bmw probably found that during testing, their temperature probes on the alternator showed to be too hot. why not direct air into it. voila.

jdstrickland 10-04-2012 12:40 PM

Quote:

Originally Posted by JTripper (Post 14787434)
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.

JTripper 10-04-2012 12:45 PM

Quote:

Originally Posted by Zell (Post 14787506)
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.

Quote:

Originally Posted by Solidjake (Post 14787519)
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.

Quote:

Originally Posted by jdstrickland (Post 14787618)
On a scale of 1 to 10, 10 being very important, it's about a 2 or 3.

I like that answer....:thumbup:

JTripper 10-04-2012 12:47 PM

Quote:

Originally Posted by E46Mango (Post 14787585)
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!
:thumbsup: now yuh talking patnah

Alex323Ci 10-04-2012 01:01 PM

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.

325CiMaN 10-04-2012 01:09 PM

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.

Sent from my DROID RAZR using Bimmer App

jdstrickland 10-04-2012 01:20 PM

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.

RayPooley 10-04-2012 01:27 PM

Quote:

Originally Posted by JTripper (Post 14787434)
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.

330ciandr6 10-04-2012 01:29 PM

Quote:

Originally Posted by jdstrickland (Post 14787618)
On a scale of 1 to 10, 10 being very important, it's about a 2 or 3.

I very much disagree.

Alex323Ci 10-04-2012 01:36 PM

Quote:

Originally Posted by jdstrickland (Post 14787618)
On a scale of 1 to 10, 10 being very important, it's about a 2 or 3.

Quote:

Originally Posted by 330ciandr6 (Post 14787792)
I very much disagree.

x2

adaseb 10-04-2012 01:40 PM

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.

Mango 10-04-2012 01:46 PM

The E39 V8 has water-cooled alternator.

330ciandr6 10-04-2012 01:51 PM

And they are expensive as ****.


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