[urq] Alternator Whine and Airflow Direction

[a2000sportster at aol.com]

Hey Guys,
 
I totally understand they are talking about smoothing the Alternator fan blades which does suck from the back as I understand it's function. My observation and personal expierience was with the Rad fan which requires the air to be sucked through the rad from the front to the rear of the car! 
 
Sorry, just too much coffee this morning :^)
 
Jack
 
 
 
 
-----Original Message-----
From: brogers at terrix.com
To: a2000sportster at aol.com
Sent: Tue, 7 Nov 2006 11:11 AM
Subject: RE: [urq] Alternator Whine and Airflow Direction


Alternator fan - not cooling fan

Brandon

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On
Behalf Of a2000sportster at aol.com
Sent: Tuesday, November 07, 2006 10:58 AM
To: urq at audifans.com
Subject: [urq] Alternator Whine and Airflow Direction


Regarding the whine, man that's fantastic that a hopefully the source of
the  noise might be the fan. Great idea to smooth the leading edges of
the fan blades...six pack and a few hours and I wouldn't be able to see
the blades ;^)
 
But the direction of the airflow would have to be from the front of the
car to the rear! If the fan pushes the air out the front at speed it
wouldn't be able to exit, because the fan would be pushing against
whatever air speed the car had. And the car would overheat, but only at
speed, idling it would come back down to normal temps....I had a leaking
radiator replaced a number of years ago on a 200 20V, and the shop that
did it couldn't find the problem of the overheating. Even though the
front metal fender and hood got hot when sitting at idle, with the hood
closed..because the fan was connected in reverse and could only push the
air out the front when the car wasn't moving! I asked them why they
couldn't drive it a couple of miles to see the problem, but their answer
was if it happens in the shop we can fix it, it can't possibly be
happening while you are driving it. Great Shop huh! My regular mechanic
was on vacation, and it was at this new shop for over a week, idiling in
! ! their lot...limped to the regular shop. When he opened the hood he
noticed the metal could hardly be touched it was so hot, looked at the
connection to the fan, flipped the switch connection, problem solved!
 
Jack
 
Message: 5
Date: Mon, 6 Nov 2006 15:25:20 -0500
From: "Louis-Alain Richard" <laraa at sympatico.ca>
Subject: [urq] RE :  alternator whine - SOURCE determined!!
To: <brogers at terrix.com>,   <urq at audifans.com>, <quattro at audifans.com>
Message-ID: <BAYC1-PASMTP11894F3EB910EB072FDEC8CEF30 at CEZ.ICE>
Content-Type: text/plain;   charset="Windows-1252"

Technical question for all:

In ETKA, the tin-metal back cover (? la urQ and 200q20v) is called an
"intake cover". So, does the air enter from the back to be pulled
through the body towards the front and exhausted by the fan? If so, then
maybe the source of the noise is in the absence/presence of said cover ?

LAR 
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