[20v] distributor swap - 7A & 3B

Ben Swann benswann at comcast.net
Thu Mar 30 12:34:30 EST 2006



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.




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


      <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.




> 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]

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