[Vwdiesel] RE: Clogging

[James Hansen]

yeah they do, but with the large volume of dust, the really fine stuff
eventually deposits on the fins to the extent of rendering them fairly
ineffective... to the point of engine shutdown on the electronic controlled
ones (1997 john deere cts combine with electronic controlled engine).
Imagine when combining canola you are grinding up stems that are mostly
filled with pith, roughly 20 plants per meter2 all with main stems that are
half inch or so round and chest high.  The stuff is electrostatically
active, grinds up into a fine dust and coats the combine- horizontal
surfaces have inch thick "drifts" of the stuff on really dry calm days. The
manufacturers don't worry about the small stuff, they are too concerned with
the large chaff from stems and such which clogs a rad in less than a minute
or so when the centrifugal separator quits.
Highway tractors have them sitting out in the bug catcher position... seems
silly when a fan and a relocate would be much more effective in the long
run.
My tractor uses air to water, so it is a non-issue.
For the caddy, i was thinking of using a modified subaru wrx type setup and
build an inertial separator of sorts into the scoop.
Keeps out bird parts and stones?  impressive.  I only worked on piston jobs
when I wrenched on planes, spray planes mostly.  Quit due to the spray
exposure which was at least a hundred times more than I get in a year on the
farm doing my own spraying with my spray coupe. (I'm careful...)
Spray plane pilots use up a lot of props due to stone erosion landing on
assorted "airstrips".
Can't imagine what a turbine would think of stones. Yuck.
-James

> -----Original Message-----
> From: Val Christian [mailto:val at swamps.roc.ny.us]
> Sent: Saturday, September 13, 2003 8:28 PM
> To: James Hansen
> Cc: vwdiesel at vwfans.com
> Subject: Clogging
>
>
> Do the larger engines have inertial separators?
>
> The Cessna 208B with a PT6A114A turbine, has an inertial separator.  Very
> effective at getting dust, stones, hail and bird parts from going into the
> 675 hp turbine.
>
> I've also seen inertial separators for intercooler air on turbo setups.
> Something like the inertial path passes through the cowling, and there
> in a secondary separated flow which goes to the intercooler.  Always
> air-to-air on the ones I've seen.
>
> Val
>
>
> >
> > Yeah, I think so.
> > Intercoolers are a great help on larger engines especially,
> running up to
> > 30psi boost.  Things like my tractor, combine, and semi all
> have them (400,
> > 260 and 275 hp respectively).  Of more benefit are the air to
> air ones, but
> > they also come in air to water (coolant) as well.  Air to air
> can lose more
> > heat, but gets plugged up- you can imagine the dust around a combine
> > plugging up the outside pretty fast, that's a daily blow out
> with compressed
> > air thing.  Air to water doesn't get plugged, but there are
> limits as to how
> > much heat can be removed by engine temperature coolant. Front
> of most power
> > units these days have an air to air unit in front of the rad
> that is half
> > plugged with dead bugs, as are most tdi ones I have looked at,
> other than
> > the one on our car that is :-)...
> > This winter project is to finally get the vw caddy on the road
> with 1.9td
> > and intercooler, although that's what I said last fall as well...
> > -J
> >
> > > -----Original Message-----
> > > From: vwdiesel-admin at vwfans.com [mailto:vwdiesel-admin at vwfans.com]On
> > > Behalf Of Kenneth E. Oldrid
> > > Sent: Saturday, September 13, 2003 3:24 PM
> > > To: dcande01 at clarityconnect.com
> > > Cc: vwdiesel at vwfans.com
> > > Subject: Re: [Vwdiesel] intercoolers
> >
> > > I believe the TDI's are the only VW diesels to come stock with
> > > intercoolers, in
> > > the US anyway. Is this true?
> > > Ken
>
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