[Vwdiesel] Cold starting with bad compression

[James Hansen]

you are absolutely correct Andrew.
My 89 Jetta td when I sold it had 550000kms and still started to -25C first
try.  Only change from stock was timing a tad advanced, and break pressure
an extra 10 bar higher.  Compression was way off already, but mileage was
good, oil consumption less than a liter between changes.  It also lived the
italian tuneup.  regular oil changes with rotella T 15-40 in sumer, 0-40 in
winter.
I think atomization has a lot to do with it, but cranking speed also has a
lot to do as well.  faster cranking speeds give a higher combustion space
temp when starting.
-James

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]On
Behalf Of Libbybapa at wmconnect.com
Sent: Tuesday, January 18, 2005 6:14 PM
To: vwdiesel at vwfans.com
Subject: [Vwdiesel] Cold starting with bad compression


I have heard it said by many people that if the compression is bad on a vw
diesel it will never start in the cold.  I think that glow plugs are
essential,
but many volks ignore injectors, which may have as much to do with it as
compression.  I recently redid the injectors in my 86 n/a jetta (managed to
crack
the injector bosses in the process due to corrosion).  I did lots of
thinking
about repair, and then finally decided to try to torque the new injectors in
there anyway.  They've held for 2 days so far.  Before installing the
rebuilt
injectors, I did a compression check.  280, 320, 420, 320.  How about that
for
s**tty.  Poor little engine has 295,000 miles on it.  The blowby is
impressive.
 Even without piching the vent hose, the loosened oil filler cap will dance
around nicely.  I'm wondering when I get the excitement of a runaway (I hope
my
wife isn't driving).  Anyway, this morning it was 16°F and I went out and
vroom, she started right up with no block heater.  when the glowplugs cycled
off
she wobbled, but came out of it fine.  I want to see the single digits, and
give her a try.  Glow is key, and atomization is key.
Andrew

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