[V8] Re:WP Pulley size

Ingo Rautenberg i.rautenberg at waratap.com
Wed Oct 6 17:02:16 EDT 2004


I'm usually pretty agreeable.  But physics tells me that since the belt
speed does not change in relation to any given WP pulley, a larger pulley
will necessarily spin slower than a smaller one.  The impeller assembly
/vanes may be designed more efficiently, however.

Don't believe me?  Try this:  Two identical bicycles are traveling at the
same speed with the same gearing, but one bicycle has smaller wheels/tires
than the other.  In order for that bicycle to travel the same speed as the
one with larger wheels/tires, the rider has to peddle proportionally faster
in order to keep up with the other one.  Same principle.

'91 200q20v...Slightly modified
'84 Tornado Red Urquattro Euro spec
'91 v8 quattro 5-Speed (not exactly stock) :-)
'91 V8 pearl (new addition)

----- Original Message ----- 
From: <allanvega at adelphia.net>
To: <CoultL at aol.com>; <v8 at audifans.com>
Sent: Wednesday, October 06, 2004 4:14 PM
Subject: Re: Re: [V8] Temp Sensor

> The water pump pulley is is not a drive pulley.....it is
driven......therefore, the larger the water pump pulley, the faster it will
pump. BTW impeller is same size. Allan
> >
> > From: CoultL at aol.com
> > Date: 2004/10/05 Tue PM 08:26:49 EDT
> > To: allanvega at adelphia.net,  v8 at audifans.com
> > Subject: Re: [V8] Temp Sensor
> >
> > If it has a larger pulley it will spin more slowly...pump less.  I
wonder if
> > the impeller design is different?  The replacement pump I bought  had a
> > smaller pulley on it than the OEM one that was on the car.  Is  that
Audi's new
> > design or did I just get some aftermarket one with a  different sized
pulley on
> > it?
> >
> > -Justin Lewis
> >
> >
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