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Date:         Thu, 27 Mar 2008 22:15:05 -0700
Reply-To:     neil N <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         neil N <musomuso@GMAIL.COM>
Subject:      Re: Vanagon exhaust diameter? + Custom exhaust fabrication
              questions.
Comments: To: Jim Akiba <syncrolist@bostig.com>
In-Reply-To:  <ac1f198b0803272128w74b8cd8ex7476a72c3510eca9@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

Hey Jim.

Thanks for the insight into the design terms/math. ( I was wondering what a "3.5" radius" referred to when viewing 180 degree "J" bend pipe online)

It's a 4-2 exhaust manifold.

I might be using the wrong terms.

By "collector" I meant the two pipes that come off the manifold, then merge into a "Y", which then has a short 2" pipe. It's a "Y" pipe. I have also referred to this as the "downpipe". Anyhow....

I cut off the flange, that bolted to the manifold, from the Jetta downpipe. I cut the downpipes roughly in half. The plan is to weld a 90 degree elbow to each port on the flange, take those to a remaining half of the downpipe (which incorporates the collector) then use 2" from the end of the collector to the cat and muffler.

If that makes sense. I should "draw" up a picture.

On Thu, Mar 27, 2008 at 9:28 PM, Jim Akiba <syncrolist@bostig.com> wrote: > So wait Neil you're building from the head all the way down or just > from the collectors down? You said "90 deg pipes" plural from > "manifold " to collector... are you referring to primaries from the > exhaust flange to the collector there? Or it the jetta system a 4-2-1 > style exhaust or something? > > With mild steel you should be able to find 1.5D bends(1.5x the > diameter of the tubing, which yields a 3" CLR or center line radius > which is how "tight" the bends are). > > Jim Akiba > > > > > > On Thu, Mar 27, 2008 at 12:01 PM, neil N <musomuso@gmail.com> wrote: > > Short run of 1 5/8" 90 degree pipes from manifold to collector, then a > > "J" pipe forward, around, and back to stock Vanagon cat and muffler. > > OR an aftermarket cat and muffler with 2" inlets/outlets. > > > > After the collector, the Jetta is 2" pipe. > > > > What is the diameter of exhaust pipe on the Vanagon? > > > > Can anyone direct me to a quiet good sounding, good fitting after > > market muffler? > > > > And how "tight" a bend can be made (mandrel bent) on 2" aluminized steel? > > > > > > > > Thanks! > > > > Neil. > > > > > > > > -- > > Neil Nicholson. 1981 Air Cooled Westfalia - "Jaco" > > > > http://web.mac.com/tubaneil > > http://tubaneil.googlepages.com/ > > >

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

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


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