Date:         Sun, 13 Mar 2005 16:41:11 -0800
Reply-To:     Damon Campbell <damoncampbellvw@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
Comments:     DomainKeys? See http://antispam.yahoo.com/domainkeys
From:         Damon Campbell <damoncampbellvw@YAHOO.COM>
Subject:      Digijet ignition clarification Q
Content-Type: text/plain; charset=us-ascii

Hello List,

I was playing with the timing today, as i had a bit of
a high idle and the timing set to 5*BTDC.  My 2.3wbx
is just a stroked out 2.1, and to make things more
exciting, it is using the 1.9 ignition system which
means it has a vacuum advance.  I wished to readjust
the timing due to the high idle and a light ping under
hard accelleration.  Several things i noticed today:

1) when set to 5*BTDC, the idle was around 1100, and
the engine would typically not drop right to that
number... it would stay higher at, say, 1400-1600, and
then gradually come down.  Power was good, and
off-idle strong.  This is how it has been running for
the last month.
2) I pulled out the Bentley and adjusted to spec
(5*ATDC with idle stabilizer disconnected, and engine
speed set to about 850 rpm - the idle speed adjustment
screw about 1/8 turn from all the way in).
3) After i adjusted per bentley, i disconnected the
vacuum lines from the dizzy, and saw a 10* change).
Idle speed rose by a couple hundred RPM.  The idle
stabilizer was still disconnected.
4) Reconnecting the vacuum lines and idle stabilizer,
the engine now idles at about 950rpm, but seems more
inclined to stall off-idle (not that it is bad, mind
you... just not as good).

I am wondering if the presumably higher vacuum pulled
from the stroked out engine would affect the stock
settings given by the Bentley.  Asked another way,
does the vacuum canister react proportionately to the
vacuum, or is it just a pre-set on-off thing at idle?
Secondly, what state is the idle stabilizer trying to
maintain?  Is it just trying to maintain a certain RPM
by adjusting the timing?

Thank you for any insight into the Digijet ignition
system,

-Damon

'84 Westy "The Van" w/2.3L WBX
Vancouver, BC



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