Date: Sun, 9 Feb 2014 18:47:23 -0500
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Exhaust Bushing Inner Weave Premature Failure
In-Reply-To: <CAB2RwfhJq_T8hNY4fKHo2LpKJbHT1TpusZ7ExrmjyAJz+v53Hg@mail.gmail.com>
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It amazing how much a turbo can quiet an exhaust. It's also amazing the effort that goes into exhaust design. On my motor home the which is also rear engine the muffler and the outlet pipes are firmly attached to the body. The outlet of the turbo directly connects to an approximately 8 inch X 5 inch flex pipe. This pipe is almost slinky like. From there is a fancy shaped pipe the connect to the muffler-cat. This is about 12"dimater and 24" long. This slinky to muffler pipe was original covered in insulation. When the pipe failed the only thing that made we aware was that I could hear the turbo whistling when I stood outside and had somebody rev the engine. Inside I knew nothing. As of now the muffler is the only part of the exhaust that is original after the turbo and slinky. Five inch exhaust can make you appreciate Vanagon exhaust quickly.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Neil N
Sent: Sunday, February 9, 2014 3:40 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Exhaust Bushing Inner Weave Premature Failure
Good points. And that's interesting re bolted flanges. I always assumed they were there *only* to help with servicing the exhaust.
So with the TD, the obvious purpose aside (turbo boost), if I were to assume that the turbo dampens exhaust pulses, does this dampening reduce wear and tear on the exhaust system or just reduce exhaust noise?
Neil.
On 2/9/14, SDF ( Scott Daniel Foss ) <scottdaniel@turbovans.com> wrote:
> About the I4 diesel set up ...
> for turbo diesel conversions mounted ala stock Diesel Vanagon ( which
> I strongly recommend ..doing it the way VW did ..engine tilted to the
> left at 50 degrees ) all I have ever done is reproduce the stock DV
> system *exactly* ..
> just in bigger pipes and with a glass pack, and I can't think of a
> case where that did not last just 'forever' ..
> and ..
> one would think an inline 4 gas would have less vibration than an
> inline
> 4 diesel.
>
> I've never even put a flex section in any exhaust system , just never
> needed to.
> in my world, all pipe to muffler and pipe-to-cat junctions are bolted
> flanges, per stock arrangement and never welded ...the junctions
> likely allow expansion and slight movement, further reducing tendencies to crack.
>
> Readers may recall one of my engine conversion mottos ..
> "Do what the manufacturers do."
>
> When they've been doing something the same way for decades ..you know
> it works.
> Why reinvent the wheel, aye ?
--
Neil n
Blog: tubaneil.blogspot.ca
'88 Westy http://tinyurl.com/c8rlw6p
'81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/
Vanagon VAG *Gas* inline-VR Engine Swap Group:
http://tinyurl.com/d7gd5ej
