6" SS EXHAUST STACK

[Kurt Horvath]

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...g70-89.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?
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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10/9/2008 12:00 AM
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>