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

Kenneth Keith auditude at gmail.com
Thu Mar 30 13:37:22 EST 2006


That makes sense.  I made the connection about the crank timing
measuring, but I didn't see the point of the 5 window distributor on a
system that uses the crank timing sensors for anything.  I guess the
urq

On 3/30/06, Ben Swann <benswann at comcast.net> wrote:
>
>
>
> 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]


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