[Vwdiesel] RE:turbo cool down

[greg rich]

Letting an engine "run down" is not just for the turbo it is also to 
stabilize the heat accross the engine, ie letting it circulate coolant to 
avoid any hot spots that could warp a head or blow a headhasket. I idle all 
my cars if they were driven hard or after a long highway run, never had to 
do a headgasket on any of them. I have an aftermarket coolant guage in one 
car and the temps really climb after shutdown, some idling helps stabilize 
it.
This is especially important in a Vanagon were the engine will be driven at 
90-100% all the time, it really works hard in those vans (I own an 82 na 
diesel vanagon), adding a turbo makes it more powerful but it also creats 
alot more heat! Let it warm up a minute before driving off and let it idle a 
minute before shutting it off, invest in a turbo timer if your 
impatient-lets the engine idle for a preset time with out the key in the 
ignition.
Greg

ps if you have ever driven a turbo vehicle without an exhaust you would 
understand how long it takes for a turbo to spin down, even the slightest 
blip of the throttle will take a good 20 seconds for the turbo to return to 
"idle"

>Subject: Re: [Vwdiesel] Turbo cooldown
>To: vwdiesel at vwfans.com
>Message-ID: <20040811025323.74206.qmail at web61205.mail.yahoo.com>
>Content-Type: text/plain; charset=us-ascii
>
>when i had a peugeot 505TD i was also told that i was
>supposed to let it idle before shudown. it even has it
>in the manual. but it wasn't for temps - it was to let
>the turbo spool down so that it wouldn't still be
>going 10,000 rpm and have no oil supply to it. also
>not supposed to rev them up for the first little bit
>to let oil flow get to the turbo.
>
>so i'd imagine that that's more the reason for it. as
>far as how long in time, i don't think it has to be
>very long unless you've had the engine racing and know
>that the turbo is really turning fast. when i was
>almost ready to shut down i was never revving the
>engine much anyway, so didn't usually do anything out
>of the ordinary - a couple seconds maybe. if i'd just
>been parking on a hill and had to maneuver the 5 speed
>up and down riding the clutch some then i'd let it
>settle a bit before shutting down, but still not more
>than 15-20 seconds.
>
>erik
>--- Libbybapa at wmconnect.com wrote:
>
> > Last weekend I picked up a diesel vanagon camper
> > with a tossed rod.  I will
> > be putting a 1.6 TD into it.  I went with a friend
> > and towed it back with his
> > Cummins TD.  Quite a truck.  He said that any time
> > you drove it hard you should
> > allow it to idle before shutting it down.  I'm
> > assuming that is to prevent
> > the oil from frying in the turbo.  I also assume
> > that is true for the vw TD.
> > How long should you idle before shutting down the
> > motor?
> > Andrew
> > _______________________________________________
> > Vwdiesel mailing list
> > Vwdiesel at vwfans.com
> > http://www.audifans.com/mailman/listinfo/vwdiesel
> >
>
>
>

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