Date: Fri, 21 Dec 2012 12:18:47 -0800
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: [Diesel-Vanagon] Re: Diesel Vanagon Exhaust Design
In-Reply-To: <CAHTkEu+MqyyDWrgBojaBzXCr+6RpQuOAGtn_xm9vfx+hbD3g8g@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Not true Don.
Jettas and Golfs and Diesel Rabbits have that bowl ..
with spring clips to hold it against the manifold.....and that does
allow engine movement without stressing the exhaust header pipe .
but it's a 4 bolt flange on stock diesel vanagons.
just look in your Bentley manual ..there's a picture of stock DV exhaust
system.
There is a special tool for those spring clamps.
there are also clever other tricks to deal with them.
Anyone who owns one and is going to work on their vehicle with those
spring clips should have the special tool.
Kinda dangerous without it.
Man ...
tons of ALH ( 1999 ) and later TDI engines have been installed more
upright. It's not newish territory.
I've been reading about those for maybe 10 years.
I think it's 'cheating' to not run a cat on a vehicle that came from the
factory with one.
Even a hollow cat looks more right and legal.
S.
On 12/21/2012 6:20 AM, Don Hanson wrote:
> Neil, the diesel vanagon exhaust downpipe uses a 'toilet bowl' type
> flange in place of a flex section. I suppose this +might+ allow for some
> movement to relieve stress, but I always figured it was like that only to
> make the system almost impossible to remove and
> install....*grin*....perhaps with some special tool it's a snap...(pun).
> When I had that system on my inline gas motor it was the very hardest part
> of working on that motor....The "C" clips that were holding the round end
> of the exhaust downpipe into the bowl-shaped manifold, those things would
> "sproing!" across my shop if I got even slightly crooked with my pry bars
> and clamps as I tried to work on that nasty set up. On an aside, the
> diesel 1.6 na. manifold has tiny inside diameters and is very restrictive.
>
> Your install is new-ish territory. With the cat and at 15deg rather
> than at 50deg...not many of those running, so there isn't any tried and
> true way. The FAST auto new-style set-up that has gotten recent
> discussion by the Tiico crowd....it *might* work...it has to be better than
> the 1st Gen Tiico ones that everyone has problems with...Key word is
> "might" since they haven't been around long enough for real world
> durability to show yet.
>
> I'd go with a system mounted to the engine only. That seems to be the
> most successful and widely-accepted way to do in inline exhaust in the
> vanagon. I would not use a flex section. As I have evolved my own
> inline exhaust systems I have had those sections crack and split....they
> are weak....I don't think they are needed..They aren't there on the diesels
> and quite a few gas conversions have been on the road for years without
> them, I read on the net.
>
> Don Hanson
>
> On Fri, Dec 21, 2012 at 12:07 AM, neil n <musomuso@gmail.com> wrote:
>
>> Thanks for your thoughts and comments Scott.
>>
>> Yah I know; don't reinvent the wheel. < grin >
>>
>> I just don't want to have to do this exhaust "design" and build job a 3rd
>> time.
>>
>> My engine is mounted at 15º, and I'm running a cat so the space
>> between the driver and passenger side "DV" brackets isn't as wide as a
>> 50º diesel Vanagon engine. The arm I built off of the driver side
>> bracket, Image: http://tinyurl.com/9ythuq5 (uses a 5" muffler
>> clamp) was an add on redesign done shortly before the down pipes
>> finally cracked. I might keep this cat support design but don't really
>> like the idea of running one the driver side exhaust support to the
>> cat.
>>
>> Neil.
>>
>>
>>
>> On Thu, Dec 20, 2012 at 10:23 PM, Scott Daniel - Turbovans
>> <scottdaniel@turbovans.com> wrote:
>>> hi ..
>>> as I said, stock DV exhaust systems don't have a problem with cracking.
>>>
>>> on the two DV systems I have laying around that have a flex junction in
>> them..
>>> the muffler is still mounted to the engine with rubber mounts.
>>>
>>> the stock system is So Good that I have reproduction left and right
>> muffler brackets that I had made.
>>> Nice 'n heavy duty too.
>>> Have a few sets left.
>>>
>>>
>>> I get them cut out by a computer controlled machine ..
>>> very simple to order say 5 more , at any time. - as they aleady
>> exisit in a computer program at my fabricator's.
>>
>>
>>
>>
>>
>> --
>> Neil n
>>
>> 6
>>
>> http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
>>
| 
