Actually the Bentley is very confusing on this point and I have asked
them in their new additions to clarify this point.  If you read through
the procedure carefully you will see that adjusting the timing with the
Temp II unplugged and the engine revving so high is only done when you
have a special tool also attached to the engine.  No one I have ever
known has had one of these so the proper way to adjust the timing on a
waterboxer is much simpler.

Let the engine warm up to normal operating temperature.
Using a timing light adjust the timing until the "V" notch in the big
pulley lines up with the case halves.
That is stock timing.
Adjust your idle to around 950 rpms and then recheck the timing and your
are done.

I usually like to advance up timing to between 7 and 10 degrees BTDC as
the engine seems to have a little more power and run a little more
smoothly there.

Hope this helps.

Ken Wilford
John 3:16
www.vanagain.com

Allan Streib wrote:
> Trying to understand the proper ignition timing for my 2.1l WBX
> (Digifant).  Based on my read of the Bentley, it should be 5 degrees
> BTDC at 2000-2500 RPM with the engine warm and Temp II disconnected.
>
> Is that correct?
>
> Another section talks about checking a 35 degree advance at 3000 RPM
> with the Temp II connected.
>
> Allan
> --
> 1991 Vanagon GL
>
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