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/ |
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