Date: Fri, 28 Mar 2008 13:29:38 -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.
In-Reply-To: <014101c8910e$af2c12d0$1dac0d05@jimsystem>
Content-Type: text/plain; charset=ISO-8859-1
Thanks for the link Jim!
Neil.
On Fri, Mar 28, 2008 at 1:02 PM, Jim @ work <jrasite@eoni.com> wrote:
> Phillip K Smith's The Scientific Design of Exhaust and Intake Systems.
>
> http://www.amazon.com/Scientific-Exhaust-Systems-Engineering-Performance/dp/0837603099
>
> Order through: http://wetwesties.type2.com/amazon.html and WetWesties gets a
> little bump from Amazon.
>
>
> Jim
>
> ----- Original Message -----
> From: "neil N" <musomuso@GMAIL.COM>
> To: <vanagon@GERRY.VANAGON.COM>
>
>
> Sent: Thursday, March 27, 2008 8:50 PM
> Subject: Re: Vanagon exhaust diameter? + Custom exhaust fabrication
> questions.
>
>
> > Thanks for the info Kim. I suspected it would be a poor idea to reduce
> > the ID of the Jetta pipe down to a Vanagon cat/muffler.
> >
> > I will stick with a 2" ID on pipes after collector. The collector
> > itself (Jetta) has 1 5/8" pipes.
> >
> > The only real technical stumbling block right now, is that the
> > collector will be shorter than the stock Jetta. The overall length of
> > the system will likely be shorter than the stock Jetta, so that
> > technical aspect I have to ignore.
> >
> > At this point, I'm flying blind in a way. I'm sure I could weld the
> > parts together, but collector length, well I'm learning. Next thing to
> > find are some 90 mandrel bent elbows. I was able to save the flange
> > from the Jetta down pipe, so I'll weld the 90's to that then to the
> > collector, and so on.
> >
> > Maybe Mr. Google will yield some info on collector lengths etc.
> >
> > Neil.
> >
> >
> >
> > On Thu, Mar 27, 2008 at 8:16 PM, Kim Springer <kimspringer@rcn.com> wrote:
> >> Neil,
> >>
> >> Pay attention to the stock system and consider using the same diameters
> >> and
> >> lengths of pipe.
> >>
> >> Exhaust systems are designed for length to the collector, from the
> >> collector
> >> to the end of the exhaust pipe and the diameters of each of these pipes.
> >> For
> >> that matter, the length of the intake is designed to tune the engine as
> >> well.
> >>
> >> I have book on tuning 4 stroke engines and another on engine design. The
> >> second is extreemly engineering technical, the first has pretty basic
> >> formulas for designing an exhaust system based on displacement, valve
> >> size,
> >> etc. If anyone is interested, I'll dig it up. In my aircooled days, I
> >> used
> >> the books to compare off the shelf exhaust system and to choose velocity
> >> stacks for my Weber carbs.
> >>
> >> Maybe, for a stock engine, this is overkill, but if you are going to go
> >> through the process of building a custom system, you might as well
> >> enhance
> >> the system or build like stock.
> >>
> >> Kim
> >>
> >>
> >>
> >>
> >> ----- Original Message -----
> >> From: "neil N" <musomuso@GMAIL.COM>
> >> To: <vanagon@GERRY.VANAGON.COM>
> >> Sent: Thursday, March 27, 2008 8:01 AM
> >> Subject: Vanagon exhaust diameter? + Custom exhaust fabrication
> >> questions.
> >>
> >>
> >> > Hi all.
> >> >
> >> > I'm gathering parts to fab up the exhaust for my Jetta conversion. My
> >> plan:
> >> >
> >> > 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/
>
>
--
Neil Nicholson. 1981 Air Cooled Westfalia - "Jaco"
http://web.mac.com/tubaneil
http://tubaneil.googlepages.com/
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