[200q20v] Knock Sensor & Oil Cooler Info

Bernie Benz b.m.benz at prodigy.net
Mon May 7 10:28:22 EDT 2001

Yes that sounds about right, but you don't have to put the screen flat up
against the core.  So double its area out front further.


> From: Kneale Brownson <knotnook at traverse.com>
> Date: Mon, 07 May 2001 11:45:54 -0400
> To: Bernie Benz <b.m.benz at prodigy.net>, <Jeff.Bernstein at pneumaticscale.com>
> Cc: 200q20V mailing list <200q20v at audifans.com>
> Subject: Re: [200q20v] Knock Sensor & Oil Cooler Info
> Did you determine the amount of airflow reduction resulting from the
> screen?  I think I read somewhere that ordinary doorscreen  material will
> reduce airflow in this sort of application by nearly half.
> At 08:09 AM 05/07/2001 -0800, Bernie Benz wrote:
>> Jeff,  You'll also find in like manner that your intercooler and aux
>> radiator are partially plugged with dirt and sand.  After cleaning, I use
>> plastic screen cloth, for screen doors, as a pre filter to keep the sand
>> out.
>> Bernie
>>> From: Jeff.Bernstein at pneumaticscale.com
>>> Date: Mon, 7 May 2001 06:30:48 -0500
>>> To: 200q20v at audifans.com
>>> Subject: [200q20v] Knock Sensor & Oil Cooler Info
>>> I had noticed that over the last few months I wasn't getting as much boost
>>> and the boost was coming on slower.  I finally saw a code referring to the
>>> #1 knock sensor.  I  looked at the sensor and found that all the outer
>>> plastic cable shielding was cracked and was disintegrating quickly.  I
>>> replaced both knock sensors since the #2 sensor was starting to
>> disintegrate
>>> also.  I now have full boost and it comes on faster also.
>>> As I was working on the car I also noticed a large leaf was blocking
>> part of
>>> the oil cooler.  I decided that in order to get the leaf out I had to
>> remove
>>> the ducting in front of the oil cooler.  Upon removal it became obvious
>> that
>>> the cooler was almost completely clogged with dirt that had slowly
>>> accumulated over the years.  I could hardly see any light though the cooler
>>> and the dirt was baked on especially the bottom half of the cooler.  I
>>> disconnected the cooler from the frame and lowered it into a bucket of
>>> water, leaving the lines attached, and soaked it for 24 hours.  I then used
>>> an air compressor to blow the small gravel and sand out of the cooler which
>>> took almost an hour of work to get the majority of the dirt out of it.  I
>>> had noticed that it seemed like the oil temperature was hotter than it used
>>> to be but it was going up over the years at a very slow rate due to the
>>> gradual build-up of dirt.
>>> I took the car out for a test drive after fixing all these things and was
>>> pleasantly surprised to find that the oil temperature was noticeably cooler
>>> even though I was making a lot more boost.  I would suggest that anyone
>> with
>>> a high mileage car should take some time to check these two items.  Very
>>> rewarding weekend project.
>>> You can see my car at a web sight that my son made for our various Audi
>> cars
>>> at http://www.bernsteincars.8m.com/.
>>> Jeff Bernstein
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