Date: Sun, 9 Mar 2008 10:10:50 -0700
Reply-To: neil N <musomuso@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: neil N <musomuso@GMAIL.COM>
Subject: Re: I4 conversion exhaust - some comments
In-Reply-To: <507421.75926.qm@web33508.mail.mud.yahoo.com>
Content-Type: text/plain; charset=ISO-8859-1
Thanks Robert.
I think I know the downpipe you are speaking of.
On Sun, Mar 9, 2008 at 9:14 AM, Robert Keezer <warmerwagen@yahoo.com> wrote:
> It's pretty much a
> bolt-in with fabbing up the left bracket the main
> delay, and welding the bellows on.
"main delay" ?
What part is that?
My engine will be a 15 degree mount. I *think* this would bring the
Tiico type downpipe up and over compared to a 50 degree. Not sure if
that would present a problem re: fit.
But thanks for suggestion of the flex joint and your findings using one.
Hopefully I'll have the engine roughed in tomorrow!
Neil.
On Sun, Mar 9, 2008 at 9:14 AM, Robert Keezer <warmerwagen@yahoo.com> wrote:
> Frank's muffler design is what I origallly tried
> to do with my I-4.
> But I found a 6-bolt flange Tiico downpipe to
> which I had the bellows welded .
>
> This goes into a cat and and then a Vanagon 2.1
> muffler, exactly like the Tiico set-up but with
> the added flexibility of the bellows to prevent
> cracking .
>
> Solid mount Tiico flanges crack.
> If possible to get the Tiico downpipes this can
> save you a lot of trouble. It's pretty much a
> bolt-in with fabbing up the left bracket the main
> delay, and welding the bellows on.
>
> Robert
> 1982 Westfalia
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> --- Frank Grunthaner <FrankGRUN@AOL.COM> wrote:
>
> > In a message dated 3/8/08 8:05:41 PM,
> > sfcompost@YAHOO.COM writes:
> >
> >
> > > Neil, with my I4 vanagon I had 2 different
> > exhaust designs with radically
> > > different results. The first set up I had
> > built at a exhaust shop using an
> > > old Dasher dual outlet manifold, which angles
> > toward the front of the van. I
> > > had the shop follow the example I had seen on
> > a German engine conversion site
> > > which ran the exhaust forward through the
> > aircooled heater tube hole, forward
> > > to a muffler hung under the center of the
> > van, into a 180 degree bend back
> > > toward the rear and then out to the driver
> > side ahead of the rear wheel. This
> > > required a simple layer of sheet metal as a
> > heat-shield to keep the heat away
> > > from the floor, but worked very well and was
> > almost too quiet. No vibration
> > > problems whatsoever. My only concern was
> > that the cat was a bit too close to
> > > the transaxle. And, I liked having the
> > exhaust coming out of the side of the
> > > van, as it told those discerning van-heads
> > that this was no normal
> > > air-cooled van.
> > >
> > Sam and other interested parties,
> >
> > When I developed the Audi 3A turbo, I used a
> > run to the front-then turn
> > around and go back approach. The Audi 80/90
> > manifolds are definitely the best for
> > the I4 gas system. Alistair had to do some
> > clearance nibbling on the 4 to 2
> > manifold and I didn't have to on my version.
> > For the Audi turbo, I used the Audi
> > 80/90 CA (for California) 4 to 1 version, since
> > it matched the turbo inlet
> > well. For the exhaust, I used the Saab turbo
> > flex downpipe (stainless net wrapped
> > bellows) then went through the air-cooled
> > heater port and up the drivers side
> > to a large bore muffler I studied the VW Golf
> > mufflers with the 90 degree
> > offset of inlet and outlet. I liked the idea of
> > coupling two of them together
> > to build the 180 degree reversal to run the
> > pipe back out to the rear. In the
> > end, I couldn't fit them in place so I went to
> > a large oval muffler (Dynamax I
> > think) that had inlet and outlet on the same
> > side. So 2.5 inch pipe in and out
> > with the outlet running back to the rear. I
> > used a long and round resonator
> > at the exit, passenger side running along the
> > side of the sound-deadening pan.
> >
> > The muffler and exhaust pipe was supported by
> > universal heavy duty truck
> > muffler supports. My space limits were given by
> > the propane tank on one side and
> > the auxiliary diesel/fuel tank on the other. I
> > also encountered some floor
> > heating and added a heat shield. My target was
> > quiet and this system has certainly
> > delivered. I had engineered out vibration
> > previously and no new vibration was
> > introduced by this system. No breakage either,
> > but the expansion/contraction
> > lever arm (also vibrational and torsional
> > stress) was resolved over a distance
> > 5 to 8 times longer than the stock system.
> >
> > For the TDi, I left this system in place. When
> > I get back to California, I
> > try to get some pictures, if there is interest.
> >
> >
> > For the I4 gas, the Audi 80/90 and Alistairs
> > approach should be fine. I went
> > from the Audi 2 port flange to a 2 to 1
> > collector then to a bellows and out.
> > All hanging from the original muffler mounts.
> > Details on Bell's website and
> > these comments from faulty memory while
> > feasting on Nürmberger Bratwurst and
> > Augustinerbrau.
> >
> > Frank Grunthaner
> >
> >
> >
> > **************
> > It's Tax Time! Get tips, forms, and advice on
> > AOL Money &
>
>
> > Finance.
> >
> >
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> >
>
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>
> ____________________________________________________________________________________
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--
Neil Nicholson. 1981 Air Cooled Westfalia - "Jaco"
http://web.mac.com/tubaneil
http://tubaneil.googlepages.com/
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