Date: Tue, 1 May 2001 08:43:38 -0700
Reply-To: Karl Wolz <wolzphoto@worldnet.att.net>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Karl Wolz <wolzphoto@worldnet.att.net>
Subject: Re: Digijet Timing Marks
The AAR is open when stone cold, and as the engine warms up, it gradually
closes. If you want to see it wide open, toss it in the freezer for an hour
or so.
The electrical contact drives a heater so that the orifice will close sooner
(I've been told it's a matter of seconds) than it would by engine heat
alone, since once the engine is running, you don't need the extra air any
longer.
Karl Wolz
----- Original Message -----
From: "Paul Borghese" <vanagon@groupstudy.com>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, May 01, 2001 7:26 AM
Subject: Re: Digijet Timing Marks
> Ok, I went through this exact same thing. First it drove me nuts that
> setting the timing to the specifications causes the engine to run poor
with
> lack of power. For weeks I thought I was doing something wrong, then
> finally I just accepted that my engine (20K miles on a rebuilt) likes the
> engine to be at a few degrees BTDC more then the manual calls.
>
> With the Aux Air Regulator, there seems to be a delay of about one second
> from the time you squeeze the hose and the time you hear the engine drop.
> The drop is quite suttle and you can best hear it when the engine is stone
> cold. The Aux. Air Regulator gradually closes the air flow when it get's
> hot. I believe it is heated by current going to the censor and not the
> actual temperature of the engine (although the engine temp does have an
> effect as it is bolted to the engine).
>
> So a slightly warm engine will have less air-flow from the Aux. Air
> Regulator then a stone cold engine/regulator. Try the test again first
> thing in the morning just after starting the engine.
>
> Good luck,
>
> Paul Borghese
>
>
> ----- Original Message -----
> From: "Jay L Snyder" <Jay.L.Snyder@usa.dupont.com>
> Newsgroups: groupstudy.vanagon
> Sent: Tuesday, May 01, 2001 8:40 AM
> Subject: Digijet Timing Marks
>
>
> > Last night I scratched a TDC mark straight across to the back flange
> > (closest to the block) and measured the distance from there to the 5
ATDC
> > notch. I then painted a new mark (5 BTDC) the same distance on the
other
> > side of the new TDC scratch mark. I set the timing at 5BTDC and adjusted
> > the idle. (I was running at about 2 or 3 BTDC). I must say, it runs
> > mucho better than 5 ATDC. I took it out for a test drive and could not
> get
> > it to ping. I do have premium gas in the tank. I did not disconnect
the
> > vacuum lines when setting the timing and had the idle stabilizer
by-passed
> > as the Bentley shows.
> > I also tried starting cold with the idle stabilizer by-passed to see if
> > the Aux. air regulator was working--it was. With the stabilizer
> connected,
> > it is hard to detect any change in rpm by squeezing it the way the
Bentley
> > says to do.
> >
> > Jay '85 Westy
> >
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