[urq] urq Digest, Vol 71, Issue 9

[Brandon Rogers]

If you can get another person to help you - - you can have that person
change the rpm while you lie down close to the alternator - when you are
right up next to it you can get a good perspective and really hear the noise
coming from the fan.

Personally - I'm convinced it is due the alternator being so close to and
halfway blocked (funky air flow???) by the front valence.  What else could
it be - like Frank said - the alternators don't make the noise when in
different locations.  

Take off the valence - see if it makes noise.

Brandon



-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of fdekat
Sent: Wednesday, September 09, 2009 12:50 PM
To: urq at audifans.com
Subject: Re: [urq] urq Digest, Vol 71, Issue 9


> ------------------------------
> 
> Message: 6
> Date: Tue, 8 Sep 2009 20:02:53 -0700
> From: AF <afinn1 at gmail.com>
> Subject: [urq]  2b relocate Alternator 'Siren' Noise?
> To: brogers at terrix.com
> Cc: urq <urq at audifans.com>
> Message-ID:
> 	<ed47d8be0909082002l25b0a044w240c9a9e7b8568d0 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> I used both the 4000Q alternator and the stock UrQ closed face 
> alternator >
on my MC motor and both made the siren noise. I assumed it was related to >
the fact that the belt was at a slightly skewed angle with the relocation
> bracket installed.
> 
> Andrew Finney
> 1985 UrQ 4.2L

Well, it still makes the noise. But I've got as far a proving it's related
to airflow 'somehow'. If I cover the back of the alternator with a gloved
hand (bloacking the air intakes), it drastically reduces the noise.

Problem is, you can't block the cooling airflow. 

And leads to the question: Why the noise when the alternator is on the left
(in a similar position as the stock alternator on a 4kq), but no noise from
the 4kq..?

=Frank de Kat=
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