6" SS EXHAUST STACK

[Kurt Horvath]

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-
89.pdf
> > <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?>
> >
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.
> > > >
> > > >
> > > > ----------------------------------------------------------
> > ------
> > > >
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> > > > Version: 7.5.405 / Virus Database: 270.8.0/1715 - Release
Date:
> > 10/9/2008 12:00 AM
> > > >
> > >
> >
> >
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10/9/2008 12:00 AM
> >
>