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FYI on Dynomax ultra Flow mufflers

Started by Back N Black, September 01, 2018, 11:24:24 AM

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Back N Black

September 01, 2018, 11:24:24 AM
I just replace two Dynomax mufflers with only 13 thousand miles on them. It sounded like rocks in a tin can, kinda disappointing. The out side looked brand new, not sure why this would happen?

Kern Dog

#1
September 02, 2018, 02:28:22 AM
Seems to me that just about every product may have even a small percentage of defects.

440

#2
September 02, 2018, 06:01:48 AM
Quote from: Back N Black on September 01, 2018, 11:24:24 AMIt sounded like rocks in a tin can

People pay good money for that sound.

cdr

#3
September 02, 2018, 12:13:40 PM
Quote from: 440 on September 02, 2018, 06:01:48 AM
Quote from: Back N Black on September 01, 2018, 11:24:24 AMIt sounded like rocks in a tin can

People pay good money for that sound.

:smilielol: ^^^^
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John_Kunkel

#4
September 02, 2018, 02:51:38 PM
Do you intend to cut them open for a show n tell?
Pardon me but my karma just ran over your dogma.

c00nhunterjoe

#5
September 02, 2018, 06:53:55 PM
Quote from: John_Kunkel on September 02, 2018, 02:51:38 PM
Do you intend to cut them open for a show n tell?

I was hoping the same thing. My guess would be the perforated tube broke loose from the case.

Back N Black

#6
September 04, 2018, 08:53:12 PM
I returned them and got two new ones, no charge!  :2thumbs:

BSB67

#7
September 05, 2018, 06:08:30 AM
I've been using the walker/dynomax mufflers for over 25 years.  I like their sound, fit and performance.  That said, they are cheaply made IMO, and change them out every few years.  Twice I've had them fail internally, and it really shows on the time slip.

500" NA, Eddy head, pump gas, exhaust manifold with 2 1/2 exhaust with tailpipes
4150 lbs with driver, 3.23 gear, stock converter
11.68 @ 120.2 mph

justcruisin

#8
September 05, 2018, 02:23:06 PM
I have a pair of welded dynomax to go on, never used them before, how have they failed Russ.

BSB67

#9
September 05, 2018, 10:16:45 PM
17747 and 1733 Super Turbo, I'm pretty sure. Maybe two 17747 failed and a 17733, but noticed the rattle and changed it out before running at the track.  Never took them apart.  One time I replaced them after loosing the characteristic 3 - 4 mph and nothing was rattling loose like usual.  I have the Ultra Flows now, and arguably there is probably nothing to fail on them, but I'll still replace the next go around.

500" NA, Eddy head, pump gas, exhaust manifold with 2 1/2 exhaust with tailpipes
4150 lbs with driver, 3.23 gear, stock converter
11.68 @ 120.2 mph

justcruisin

#10
September 06, 2018, 04:43:12 AM
Right - looking at the ultraflow 17219's  I have, they seem well constructed to me, I doubt they would build enough pressure to blow out with the straight through design. I have always run turbos before with no issues, although mostly street use.

c00nhunterjoe

#11
September 06, 2018, 05:59:36 AM
A failure on the ultraflos would most likely bethe tube weld cracking and rattling. For them to become a restrictjon would be very interesting to see.

Brass

#12
September 06, 2018, 04:47:28 PM
I had a 17230 fail but I don't know how many miles were on it and I didn't cut it open.  It rattled pretty a badly.
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