6" SS EXHAUST STACK

[ronmarabito2002]

I went to 5" muffler on my 8V92 last year. Have not noticed any
change in performance. My logic is the fact that 5" is the outlet
from the turbo. Besides that, 5" is the common exhaust on most of the
over the road rigs today. There are exceptions, but I don't see any
advantage to 6" with the turbo outlet restricted to 5"

R.E. (Ron) Marabito, Dallas, TX 92WB40


--- In WanderlodgeForum@yahoogroups.com, David Brady wrote:
>
> The LXi, like your WB, uses a 6 inch muffler. Five inch will
> certainly suck some ponies away.
>
> David Brady
> '02 LXi, NC
>
> Kurt Horvath wrote:
> >
> >
> >
> > Yea I've heard that but the one with the liner has fixed the high
> > pressure leaks according to the Mfg. Let's hope. Prevost has from
> > what I recall pipes bent in one piece, they are held together with
> > those nifty band clamps that seat and conform to the pipe exterior,
> > If the V-Bands and Flanges don't work out I'll go to those pipe
> > clamps. The Flanges are also available with three different types of
> > gaskets, o-ring, flat, and, and, and I can't remember, oh yea the
> > type I bought, male-female flanges, perfect alignment, leak free,
> > again according to Vibrant Mfg. There is also a Stainless Steel
> > Muffler available that may work well on your coach, but it's inlet
> > outlet is 5" not the 6" like on your coach. well I assume yours is
> > 6"??? Also it is 10" in diameter which would help with crowed exhaust
> > tunnel.
> >
> > Kurt Horvath
> > 95 Pt 42
> > 10AC
> >
> > --- In WanderlodgeForum@yahoogroups.com
> > , David Brady
> > wrote:
> > >
> > > Hi Kurt,
> > >
> > > No thanks, I already have a stock muffler. Thanks for the links,
> > > there's some pretty nifty items there. Be careful with those fancy
> > > braided stainless steel pieces. They look sharp, but they've always
> > > leaked on my turbocharged subaru wrx. Kurt, you've been around
> > > a few over-the-road coaches, Prevost' and what not, what do they
> > > run on their exhaust systems; i.e., expansion pipes, flex pipe, etc.
> > >
> > > David Brady
> > > '02 LXi, NC
> > >
> > > Kurt Horvath wrote:
> > > >
> > > > David, Would you like to take that brand new muffler off my
> > hands???
> > > >
> > > > According to DD straight pipe & ECU will not have any issues in
> > the
> > > > 95 vintage S 60.
> > > >
> > > > OEM built that pipe for BB ACAP - As Cheep As Possible -
> > > >
> > > > The original routing of the pipe leaves the turbo, source of the
> > > > first failure, cracked the 1st 90 degree turn a short straight run
> > > > 2nd. 90 degree turn, then into a double ball connector that also
> > > > telescopes in and out. You can check out that piece of S---, sorry
> > > > engineering wonder here.
> > > >
> > > > http://www.dynaflexproducts.com/download...g_03_pg70-
> > <http://www.dynaflexproducts.com/download...g_03_pg70->
> > 89.pdf
> > > > <http://www.dynaflexproducts.com/download...g_03_pg70-
> > <http://www.dynaflexproducts.com/download...g_03_pg70->
> > 89.pdf>
> > > >
> > > > Page 76 Double Ball Joint with Slip Joint Feature Allowing Lateral
> > > > Movement length 16 to 18 inches mine measures 14 .55 inches at
> > > > present. This marvel allows for 10 degrees of angularity 360
> > degree
> > > > rotation 2" of offset 2" axial movement,. Hell the u joints can't
> > > > move around that much. Besides it was hard clamped to the mount
> > from
> > > > the engine in front of this connection not to mention rusted to
> > the
> > > > point that it took an pneumatic impact chisel to get it apart.. So
> > > > what's the point. You need flex in between the turbo and the first
> > > > mount.
> > > >
> > > > The Flex Connector with liner I choose is here at
> > > >
> > > > http://vibrantperformance.com/catalog/product_info.php?
> > <http://vibrantperformance.com/catalog/product_info.php?>
> > > > <http://vibrantperformance.com/catalog/product_info.php?
> > <http://vibrantperformance.com/catalog/product_info.php?>>
> > > >
> > cPath=1022_1035_1064_1114&products_id=1008&osCsid=999d7ef5fdd15864bae3
> > > > 3db41abf5ef9
> > > >
> > > > The 2 90 degree turns were fabricated in that manner because it's
> > not
> > > > easy to bend large diameter pipe in a single 180 degree bend, thus
> > > > they weld 2 90's together, which is the industry standard for
> > > > manufacturing a 180 degree turn in large pipe exhausts. Well this
> > > > ain't the factory and we're not constrained by what is easy. I
> > have
> > > > acquired a 14ga 180 degree U-Tube that has the same external
> > > > dimensions as the original pipe. I'm not an engineer but I
> > reasonably
> > > > certain that with the remaining 90 degree bend and a 45 degree
> > bend
> > > > there will be sufficient back pressure.
> > > >
> > > > There will also be a flexible pipe hanger mount behind the Flex
> > > > connector mounted on the ceiling of the engine compartment that
> > will
> > > > support the middle section of pipe and will allow for any movement
> > > > and or torque that may be transferred to the pipe by the motor.
> > The
> > > > original clamps for the muffler have to go as they are 6" but the
> > > > rubber isolated mounting bars will remain and that's all that was
> > > > there to begin with. So where's the rub? Bub!
> > > >
> > > > Not to take anything away from the engineers that designed the
> > Bird,
> > > > But there are some glaring deficiencies. 7 way trailer plug, Air
> > > > Purge System, Watts valve, Accelerator and Brake peddles, Front
> > Left
> > > > Shock Mount, Relay for Jake Brake, W/D Vent for Slendide 2000,
> > > > Installation of Refrigerator with inadequate convection, The seat
> > > > belts mounted to floor instead of the seat, That reminds me I
> > still
> > > > have to fix that one. Nothing like hitting a road transition just
> > to
> > > > have the air ride seat bounce and the seat belts automatically
> > adjust
> > > > for the slack then the air ride seat rebounds and the belts try to
> > > > cut you in half at the waist. That's just the 95 PT 42. I'm not
> > > > bitchin! I'm fixin
> > > >
> > > > Kurt Horvath
> > > > 95 PT 42
> > > > 10AC
> > > >
> > > > --- In WanderlodgeForum@yahoogroups.com
> >
> > > > , David Brady
> > > > wrote:
> > > > >
> > > > > Kurt,
> > > > >
> > > > > I agree with Greg. I'm gonna keep mine stock. There's a bunch
> > > > > of vibration and movement back there. I figure BB's been
> > building
> > > > > buses a whole lot longer than I have. Initially I'd scratch my
> > > > > head when looking at the frame and support pieces, but when
> > > > > you consider that something as big as a bus must twist and flex,
> > > > > this flexibility needs to be designed in. Make one piece
> > stronger
> > > > > and you've created a stress raiser someplace else.
> > > > >
> > > > > I have a friend who transplanted a honda v-tech motor into a
> > > > > lotus elise. Everything worked but the alternator mount. The
> > mount
> > > > > insists on cracking. There can be some weird harmonics and
> > > > > resonant frequencies going on that are difficult to grasp and
> > > > > only trial and error and a 50 year track record of building
> > buses
> > > > > can solve (unless you can model it and run high powered
> > > > > computer finite element analysis on it). He's still fighting
> > that
> > > > > mount...
> > > > >
> > > > > Okay, I'm off my soap box.
> > > > >
> > > > > David Brady
> > > > > '02 LXi, NC
> > > > >
> > > > > Gregory OConnor wrote:
> > > > > >
> > > > > > Kurt, try and figure why there were 4 bends. it may be that
> > it was
> > > > > > engineered to alow for swing room between the 'hung exhaust'
> > and
> > > > > > the 'torque reaction of the ruber mounted detroit'. look at
> > the
> > > > roll
> > > > > > of the torque and see that there is a place for the movement
> > to
> > > > twist
> > > > > > a union. I kinda think this movement was the problem with the
> > > > > > resulting crack. crack=result ;movement=cause ;facilitate
> > movement
> > > > > > =repair. may be that BB enginered it correct but someone
> > > > > > overtightened a band to cure an exhaust leak??????? you also
> > got
> > > > to
> > > > > > keep the stack from cantilivering off of the maniford with
> > your
> > > > new
> > > > > > design. Scavenging is one variable in fuel efficiency. even
> > > > straight
> > > > > > pipes some time will result in lower fuel economy because the
> > > > intake
> > > > > > variable get screwd. backpressure is mathed into the computer.
> > > > > >
> > > > > >
> > > > > > ----------------------------------------------------------
> > > > ------
> > > > > >
> > > > > > Internal Virus Database is out-of-date.
> > > > > > Checked by AVG.
> > > > > > Version: 7.5.405 / Virus Database: 270.8.0/1715 - Release
> > Date:
> > > > 10/9/2008 12:00 AM
> > > > > >
> > > > >
> > > >
> > > >
> > > > ----------------------------------------------------------
> > ------
> > > >
> > > > Internal Virus Database is out-of-date.
> > > > Checked by AVG.
> > > > Version: 7.5.405 / Virus Database: 270.8.0/1715 - Release Date:
> > 10/9/2008 12:00 AM
> > > >
> > >
> >
> >
> >
------------------------------------------------------------------------
> >
> > Internal Virus Database is out-of-date.
> > Checked by AVG.
> > Version: 7.5.405 / Virus Database: 270.8.0/1715 - Release Date:
10/9/2008 12:00 AM
> >
>