Subject: rebuilt high pressure hose to rack growl

[Arun Rao]

It turns out that even the dealers (Carlsen Audi in Palo Alto in my
case) sell two kinds of "OEM" hoses.  The cheaper (apparently
aftermarket) one growls, the more expensive one doesn't. Trust Audi to
make a hydraulic hose a tuned cavity (or maybe it's common practice): as I
understand it, if any of the components in the system isn't quite right
(hose material, restrictor diameter), you get nice standing waves in the
hose and consequent growling.

There you have it :(

-Arun


On Wed, 20 Feb 2002, Christopher Ritchie wrote:

> Konstantin Bogach wrote (in part):
>
> rebuilt hose to steering rack growls from very beginning. I
> came
> across reports about this problem but other posts did not have
> such
> complains.  Because it seems so simple - hose + restrictor, I
> decided to
> go for it.
>
> Any idea why it growls?
> ***********************
>
> No idea.  But mine has been doing the same thing now for over 1 year.  No
> problem with old hose and old rack.  When rack replaced (with Jorgen), new
> OEM hose installed.  Started growling immediately thereafter.  Moderate at
> first.  Now hardly noticeable.  Seems to diminish with use.
>
>
>
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--
Arun Rao
Pixar Animation Studios
1200 Park Ave
Emeryville, CA 94608
(510) 752-3526