distributor swap - 7A & 3B

[Ben Swann]

Ken,

 

The single window hall sensor does not really indicate the engine has knock
sensing, and is also used on the earler Ur Quattros without knock sensing.
Also, the later NG/NG have 5 window hall sensor and knock sensing too.

 

It has more to do with the use of the flywheel sensors that identify Top
Dead Center and count number of teeth - RPM and Speed sensors.  These are
synchronised with the single window hall signal.

 

Except for the wheel, the distributors are more or less the same - some use
a vacuum advance and some don't and the sonnector style, cap and rotor
change - so they can have more part numbers I suppose.

 

Anyway, the upshot of this is that the 3B and 7A distributors are
interchangeable and pretty much identical.

 

Ben 

 

benswann at comcast.net

 

[Date: Wed, 29 Mar 2006 10:38:11 -0700

From: "Kenneth Keith" <auditude at gmail.com>

Subject: Re: distributor swap

To: 200q20v at audifans.com

Message-ID:

      <2419862c0603290938h52d94853v30a277b28ae7728a at mail.gmail.com>

Content-Type: text/plain; charset=ISO-8859-1

 

Actually, that's incorrect.  7A's have knock sensing ignition too, and
therefore use a single window hall sensor setup.

 

Ken

 

> On 3/28/06, lynnreid at valornet.com <lynnreid at valornet.com> wrote:

> >

> > Does anyone know if a distributor from a 3B engine can be  be used 

> > in a 7a engine?

> > Thanks

> > Les]