Date: Thu, 5 Sep 2013 21:45:23 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Early Friday Post--don't open until September 6
In-Reply-To: <05ef01ceaa8f$079fc700$16df5500$@hiwaay.net>
Content-Type: text/plain; charset="US-ASCII"
Actually Diesel engines run with lots of excess air since (until recently)
they do not have throttles. This is part of how they get that fuel economy.
Speed control is done via fuel control, not the air/fuel mixture. This
excess air (O2) combined with the higher combustion pressures makes for the
creation of NOx. Turbo charging can make this even worse. Later engines do
sometimes control air intake by controlling the turbo or even the intake
valves and compression ratios are also lowered. EGR is another method of NOx
control. Everything 2007 and later has some type of exhaust after treatment.
AFAIK the small VW don't need the DEF, The large ones like the Tourag do.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Tom Hargrave
Sent: Thursday, September 5, 2013 7:24 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Early Friday Post--don't open until September 6
Mercedes has been using urea in their modern diesel engines for a while. It
reacts with the exhaust gas to reduce NOx emissions that are produced
because the engine is set very lean to reduce particulate emissions (the
diesel smoke most of us remember).
http://en.wikipedia.org/wiki/Diesel_exhaust_fluid
And for those who made the word association, one is a component of the other
but you can't just pee into your urea tank & expect it to work.
Thanks, Tom Hargrave
www.kegkits.com
www.stir-plate.com
www.towercooler.com
www.grow-sun.com
www.raspberryproject.com
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of
Jim Felder
Sent: Thursday, September 5, 2013 6:17 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Early Friday Post--don't open until September 6
Shows how modern I am. I have heard of the chemical urea, but had no idea it
had any use in a diesel engine.
Jim
On Thu, Sep 5, 2013 at 6:01 PM, Scott Daniel
<scottdaniel@turbovans.com>wrote:
> You are not familiar with Urea , a liquid that most modern US model
> diesel cars and light trucks need these days ?
> Did you google it ?
> Might learn readily by doing that.
>
> Chevagon ?
>
>
> On 9/5/2013 3:49 PM, Jim Felder wrote:
>
> I will be traveling from early until late tomorrow, but I just have to
> have input on this matter ASAP!
>
> I'm looking at a mailer that Chevrolet sent me advertising a Chevy
> Cruze Clean Turbo Diesel, and the brochure compares it favorably (of
> course) with a VW TDI.
>
> But here's the part that gets me:
>
> In the section that explains Chevy's 2-Year Schedule Maintenance
> Program, there's this entry under the "free" category:
>
> "Diesel Exhaust Fluid Refills"
>
> Huh? Is this to be filed with Johnson Rods and Overhead Muffler
> Bearing pranks? What is a "Diesel Exhaust Fluid Refill," and what
> exactly is Diesel Exhaust Fluid?
>
> Anxious to find out what my Diesel Westy is missing,
>
> Jim
>
> PS What a Vanagon conversion this Chevy engine would make if it is any
> good! I have heard nothing but good from people I know who have driven
them.
>
>
>
>
