[urq] 2b relocate Alternator 'Siren' Noise?

[Brandon Rogers]

I used both types of fans in my search for a quiet alternator - I also bent
some of the stamped fins in order to break any sort of pattern - all changes
made a difference (quieter, different pitch, etc) - but none got rid of the
noise.

Brandon

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of Andrée-Anne Bourgeois
Sent: Friday, September 04, 2009 1:16 PM
To: 'fdekat'
Cc: urq at audifans.com
Subject: Re: [urq] 2b relocate Alternator 'Siren' Noise?


One more observation : 4kq alternator uses a normal fan, ie not solid-faced
and it is placed in the incoming airflow, while the urQ's in behind a solid
cover. 

How do I know that ? During a winter ride in Brady's 4kq, the front of the
car was literally packed with snow. I used my hand to remove it from the
lower grille, just to have a finger caught into that da*n fan about an inch
further. I still remember the pain, many years later.

Different fan and different positioning, that surely explain the different
sounds.

LAR

-----Message d'origine-----


But when I even lightly covered the air intakes on the back of the
alternator, there was a very noticable change in the sound.

So a clue in the direction, but no solution. Can't really run the alternator
without the cooling airflow, and doesn't explain why the noise seems to be
'alternator location dependant'. 

4K alternator is in a similar position, but no big noises from it..??

=Frank=


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