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11-01-2008, 13:27

Kurt,

The Donaldson website has some interesting pdf's which

show exhaust temps and flow rates (cfm) for the 500 hp

Series 60 motor:

http://www.donaldson.com/en/exhaust/supp...053704.pdf

From this they get temps of 825 deg F, and CFM's of

2877 cubic feet/min, and max back pressure of 3 in of Hg.

Then you can go to this pdf to select a muffler based on the

input/output diameter, exhaust temp and CFM.:

http://www.donaldson.com/en/exhaust/supp...056799.pdf

There are no six inch mufflers, of the five inchers 3 seam suitable,

but all are on the hairy edge. If your seeking to reduce backpressure

and improve performance, then none are suitable and you'll have

to go with someone elses six, or dual fives.

The three that are close are:

M090535, 3260cfm at 3"Hg

M100944, 2950cfm

M120747, 3100cfm

I compared the volume of the mufflers with the volume of the

stock muffler:

M090535, 44" len, 9" dia, 2800 cubic inches

M100944, 44" len, 10" dia, 3455 cubic inches

M120747, 26" len, 12" dia, 2940 cubic inches

Stock: 48" len, 12" dia, 5400 cubic inches

Not saying that volume of the muffler improves flow characteristics,

but it in the absence of other stock muffler specific data, this is

an interesting comparison.

David Brady

'02 LXi,

David Brady wrote:

But Kurt, it's only 5 inches, correct? The turbo dumps into

5 inches but the gases are hot, low density, low pressure and

moving fast. As the exhaust progresses down the exhaust

system the air cools, becomes more dense, and back pressure

increases. If way down the exhaust you go from 6 to 5 your

increasing the backpressure. This will make the exhaust run

hotter at the turbo, high turbo pyrometer, less turbo velocity,

and a reduction in performance. 5 inches is 20 square inches,

while 6 provides 30, a whopping 50% improvement. I'm gonna

stick with the 6 or figure out a way to stuff 2 five inch stacks

in the corner of the bus. If you take it down to 5 inches, let

us know if your turbo pyrometer shows excessive temps on

those long 6% grades. I think the key is eliminating/reducing

back pressure.

Do you have a web page for the 5" stack that you'd like to

use?

Check this out: http://dieselinjection.net/BRUCE/articles.html

David

'02 LXi, NC

Kurt Horvath wrote:
Gregg,

Yea, ALL SHOW AND NO GO!-

David,

I know what you're after but the pipes I described are basically

straight pipes with a very well designed sound surprising ceramic

coating that does not restrict flow. But won't be as harsh as a

straight pipe. Cost is nominal at $250.00 Vs $200 for a straight pipe

Kurt Horvath

95 PT 42

10AC

@yahoogroups.com, "Gregory OConnor" ..>
wrote:

>

> Kurt, I dont think big thick straight pipes were mounted on those

> rigs for performance or efficiency. its all looks and
compensation.

> Bet every trucker with 8 inch stacks also drive a 4x4 requiring a

> step latter to get into.

> Greg 94pt,toyota pickup

>

> --- In "WanderlodgeForum%40yahoogroups.com",
"Rob Robinson"

> > wrote:

> >

> > Kurt two years ago up here in BC I saw a millenium Bluebird

parked

> across

> > from me at my home RV park that had two stacks. The owners
were

only

> > visiting and must have been out sight seeing most of the time

> because I

> > never did see them. I sure would have like to see behind
their

> engine bay.

> >

> > 2008/11/1 Kurt Horvath

> >

> > >

> > > I guess you could or go to a large 8" single , bit the
chrome

> shops

> > > sell them for outrageous prices---$692.00

> > > http://www.iowa80.com/DirectionsWEB/webcart_productDisplay.php?

> > > itemid=74151

> > > Kurt Horvath

> > > 95 PT 42

> > > 10AC

> > >

> > > In "WanderlodgeForum%40yahoogroups.com"

> 40yahoogroups.com>,

> > > David Brady wrote:

> > > >

> > > > Now we're talking. Can you fit two stacks back
there? I'm

> > > > serious. This will be an improvement in
performance. Two

stacks

> > > > will dramatically reduce backpressure, which will
result in

> > > > lower turbo pyrometer temps, and will allow more
boost and

> > > > more power. A single 5 inch, as compared to the
stock 6"

> > > > will do the reverse.

> > > >

> > > > David

> > > > '02 LXi, NC

> > > >

> > > >

> > > > Kurt Horvath wrote:

> > > > >

> > > > > One pipe from the turbo then splits to two
stacks.

> > > > >

> > > > > Kurt Horvath

> > > > > 95 PT 42

> > > > > 10AC

> > > > >

> > > > > --- In "WanderlodgeForum%40yahoogroups.com"
> 40yahoogroups.com>

> > > > > <"Wanderlodge"Forum%40yahoogroups.comdgeForum%

> 2540yahoogroups.com>>,

> > > David Brady

> > > > > wrote:

> > > > > >

> > > > > > But doesn't the trucking industry run
dual exhausts?

> > > > > >

> > > > > > David Brady

> > > > > > '02 LXi, NC

> > > > > >

> > > > > > Pete Masterson wrote:

> > > > > > >

> > > > > > > Having recently replaced my muffler
(at great expense) -

-

> had

> > > I

> > > > > to do

> > > > > > > it over again, I'd have switched
over to a 5" system

from

> > > turbo to

> > > > > > > stack. As others have stated, it's
5" at the turbo

outlet

> and

> > > the

> > > > > > > standard in the heavy truck industry
is 5".

> > > > > > >

> > > > > > > The only performance difference I
notice (between the

old

> > > blown

> > > > > out

> > > > > > > muffler and the new one) is that the
exhaust-type Jake

> brake

> > > > > seems to

> > > > > > > be slightly less effective.

> > > > > > >

> > > > > > > Pete Masterson

> > > > > > > '95 Blue Bird Wanderlodge WBDA 42

> > > > > > > aeonix1@ <"aeonix1%"40mac.com

2540mac.com>>

> > > > > > > On the road at Hohenwald, TN
(Natchez Trace Parkway)

> > > > > > >

> > > > > > > On Oct 31, 2008, at 11:24 PM, Kurt
Horvath wrote:

> > > > > > > > <snip>

> > > > > > > > For the last four weeks I have
queried Detroit Diesel,

> > > Custom

> > > > > Exhaust

> > > > > > > > Fabricators, Several OEM
Exhaust Mfg.'s, Marine

Exhaust

> > > > > Engineers &

> > > > > > > > Fabricators, My BB Guru, and
anyone else that would

> lend an

> > > > > ear, and

> > > > > > > > no one has expressed any
apprehension or regard in the

> > > respect

> > > > > to a

> > > > > > > > 5" exhaust system. In fact all
parties expressed their

> > > surprise

> > > > > in

> > > > > > > > respect as to why the system
would change size at the

> > > muffler.

> > > > > > > >

> > > > > > > > Several owners have modified
their systems to 5" from

> end to

> > > > > end, and

> > > > > > > > have seen no change in
performance. Positive or

> negative, In

> > > > > general

> > > > > > > > it was just a matter of
convenience in acquiring

parts,

> I

> > > won't

> > > > > get

> > > > > > > > into that. That has recently
been beaten to death at

the

> > > > > expense of

> > > > > > > > all parties involved

> > > > > > > >

> > > > > > >

> > > > > > >

> > > > > > > --------------------------------------------------------

--

> > > > > ------

> > > > > > >

> > > > > > > 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

> > > > >

> > > >

> > >

> > >

> > >

> >

> >

> >

> > --

> > Rob, Sue & Merlin Robinson

> > 94 WLWB

> >

>
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