new head impressions/problems (of course)

[amalventano1@comcast.net (Allyn)]

on that o2 sensor voltage reading issue, you simply cant get an accurate reading
with an analog voltmeter. o2 sensors can make voltage potential only, the
voltage cant do any work. as soon as you introduce an analog meter into the
circuit, it drags the voltage down. you need a digital meter (and hopefully a
good one at that), with high impedance inputs. this is the only way to get a
semi-accurate voltage reading (even then its not perfect since even a digital
meter draws a tiny amount of current from the measured circuit).
Al

----- Original Message -----
From: "Michael Abatzis" <abatzis2@hotmail.com>
To: <scirocco-l@scirocco.org>
Sent: Tuesday, September 17, 2002 11:58 AM
Subject: Re: new head impressions/problems (of course)


> >From: "Dave Ewing" <rabbit16v@attbi.com>
> >
> >1.  The cam gear should be at the same place as the stock cam gear
>
> yeah-the problem is is that when i set the cams where i think they should be
> (marks aligned with head, using cam gears @ chain), the mark on the sprocket
> doesn't appear to be at TDC, but back a tooth. i suspect the cam gear was
> installed maybe one tooth off.
>
> >2.  Also, another contraversy on this list, how did you install
> >the O2 sensor?
>
> i did this twice-first time, i soldered everything and it didn't work.
> second, i crimped with shrink wrap. still didn't work. turned out to be a
> loose connection at the plug (to one of the white wires). i sort of assumed
> that the 02 sensor would work when heated, even with the white wires
> disconnected. this isn't the case. now i just want to measure the output
> from the green wire directly--if it's a sensor issue, i shouldn't have any
> voltage. unfortunately, we're talking mV, which an analog gauge isn't
> sensitive enough to pick up (someone mentioned that the resistence is too
> high also, which makes it even harder to see).
>
> >4.  Who installed the head?  You?
>
> me. otherwise it would be working :)
>
> >Was the oil changed after the
> >install?
>
> drained the oil before removing old head.
>
> >I know that a lot of times you don't think coolant will get into
> >the oil especially if you drain the cooling system first but after
> >replacing
> >a head the oil should ALWAYS be changed along with the filter.  If you have
> >done this and you are still getting coolant in the oil
>
> i'm getting oil in the coolant, not vice versa. oil looks fine. more i think
> about it, the more i think oil got into coolant passages during
> shipping--most oil was drained, but there was still some sloshing around.
>
> >I hope that during the porting and polishing that a water
> >jacket wasn't compromised!!!
>
> head's used. it was breandon (list member) before he wrecked his car. brett
> cooke also had the engine in his car briefly with no problems.
>
> >Let us all know how this plays out as I, at least, am curious!!  Hope some
> >of this helps!
>
> thanks-helps a lot. one thing i've found out. i richened the mixture
> yesterday after the initial drive by 1/4 turn b/c i didn't want to burn a
> valve. obviously, the dpr current is still fixed at 10ma. what i wasn't sure
> about was whether changing mixture in the face of a fixed current does
> anything. it does. car is really bogging now at low rpm. so basically, w/o
> the dpr i have no way (other than seat-of-pants) to set the mixture. i
> really need to straighten this out first i think. i'm going to mess more
> today, let you know how it turns out.
>
> -Michael Abatzis
> Hotlanta! GA
> 1988 Scirocco 2L 16v RIP-->parting, prelim web site, but not taking orders
> yet: www.learnlink.emory.edu/~mabatzi/mikes_page1.html
> 1987 Scirocco 2L 16v...
>
>
> >
> >Dave
> >
> > > finally finished installing my new head today. 1.8 16v P&P, decked
> >.012",
> > > schrick 268/276.  first-it feels fast; good midrange. surprisingly, it
> >loses
> > > steam at about 6k. at my little timing stretch of road, it was just
> >about
> > > the same speed as my old head (1.8 w/ euro cam).  several problems:
> > > 1. timing--i'm pretty sure i'm off with the timing.  when i timed it by
> >the
> > > cams, the sprocket (kent adjustable) mark was back toward the firewall
> >by
> >a
> > > tooth. not sure why. brett c said this was because of the decked head,
> >but
> >i
> > > still don't understand why the cams would be on, but the sprocket
> >wouldn't;
> > > the sprocket is connected to the cams. i timed it to the sprocket mark.
> > > tomorrow i'll try moving it a tooth.
> > > 2. mixture is a constant 10ma. i hate this. just replaced o2 sensor a
> >couple
> > > of mos ago, and had a problem with the connector to the heating wires. i
> > > don't think that's the issue now.  measuring o2 voltage directly, my
> >needle
> > > barely moves. but it does move. analog crap ammeter. i think i'll break
> >down
> > > and buy digital soon. i richened by 1/4 turn just to be safe.  can
> >anything
> > > else cause this constant 10ma besides o2 sensor and ecu? turning the
> >screw
> > > doesn't seem to affect dpr at all.
> > > 3. idle is crap. expected this, but if i come off the gas hard at a
> >light,
> >i
> > > stall. can't really deal w/ this till i straighten out the above.
> > > 4. there's oil in the coolant. yikes. not a ton, but enough to make me
> > > worried. no white smoke, no water in the oil. i probably got it in the
> > > coolant passages with all my messing around. did a compression test and
> >got
> > > 140-150-150-130. this was with the timing off a couple of teeth, which
> >i'm
> > > guessing is the cause of the low compression. should've repeated, but
> >i'm
> > > lazy.
> > >
> > > i think that's it. i have a fuel enrichment box that's been unhooked (it
> >was
> > > faster without it). once i get timing/mixture right, i'll hook it back
> >up.
> > > any suggestions on how i should proceed/what i should shoot for for idle
> > > specs?
> > > tia,
> > >
> > > -Michael Abatzis<--takes apart perfectly working cars, and makes it so
> >they
> > > don't work as well.
> > > Hotlanta! GA
> > > 1988 Scirocco 2L 16v RIP-->parting, prelim web site, but not taking
> >orders
> > > yet: www.learnlink.emory.edu/~mabatzi/mikes_page1.html
> > > 1987 Scirocco 2L 16v...
> > >
> > >
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