Thanks Frank.

I have yet to mount the Jetta engine. It's a 15* mount, though I'm
sure the angle of the engine won't make a huge difference in terms of
choosing between running it forward/back and out the side, or using
the more common approach.

When it's roughed in, I'll have a much better idea of how to run the exhaust.

It'll be mounted soon though. Soon......  :^)

Neil.

On Sat, Mar 8, 2008 at 10:36 PM, 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 N�rmberger Bratwurst and
>  Augustinerbrau.
>
>  Frank Grunthaner
>
>
>
>  **************
>  It's Tax Time! Get tips, forms, and advice on AOL Money &amp;
>  Finance.
>       (http://money.aol.com/tax?NCID=aolprf00030000000001)
>

-- 
Neil Nicholson. 1981 Air Cooled Westfalia - "Jaco"

http://web.mac.com/tubaneil
http://tubaneil.googlepages.com/