Anti-reversion?

justcallmeb · 10-29-2015, 12:44 AM

Before the flaming begins (you get what you pay for, Save your money and go with a known brand, I wouldn't trust it, etc), I am curious about the design of these test pipes. They have an anti-reversion chamber in it. I have never heard of anti-reversion and was wondering how this possibly effects the sound of the exhaust as well as performance. If anyone has any knowledge of what the design concept is suppose to do and can further explain it more than "smooth out the exhaust" and "keep exhaust gasses from going back up the pipe" I would like to hear it as I am curious. Might get them just to see out of plain curiosity, but still REALLY skeptical to even entertain it.

James10694 · 10-29-2015, 04:08 AM

Saw those on Facebook. I was curious as well

SouthArk370Z · 10-29-2015, 07:55 AM

"Anti-Reversion chambers" sounds (and looks) like ad-speak for "tuned expansion chambers" to me - but I'm no expert.

Rusty · 10-29-2015, 09:23 AM

Basically there is a cone (funnel) in the pipe. The large end is facing the engine. Think of the exhaust as a sound wave that is traveling down the pipe. As the sound wave comes to a muffler or something else. It sets up a sound wave that is traveling back to the engine (your reversion). If the wave can go back to the engine. It robs power by slowing down the exhaust. The cone stops the wave from traveling any farther in the exhaust towards the engine. Closer to the head, better the results. I've had a set of headers that had the cones just inside the header flange at the engine. I couldn't tell the difference with them.

justcallmeb · 10-29-2015, 12:46 PM

So if it prevents the exhaust from going back up, would it possibly reduce/prevent the hiss that can be heard from other test pipes?

Rusty · 10-29-2015, 04:56 PM

Quote:

Originally Posted by justcallmeb

So if it prevents the exhaust from going back up, would it possibly reduce/prevent the hiss that can be heard from other test pipes?

Don't know. The hiss is from the harmonics in the exhaust from the VVEL.

10-29-2015, 12:44 AM	#1 (permalink)
justcallmeb Base Member Join Date: Mar 2012 Location: Ewa Beach, HI Age: 41 Posts: 29 Drives: 14 Nissan 370Z PW M6 Rep Power: 13	Anti-reversion? Before the flaming begins (you get what you pay for, Save your money and go with a known brand, I wouldn't trust it, etc), I am curious about the design of these test pipes. They have an anti-reversion chamber in it. I have never heard of anti-reversion and was wondering how this possibly effects the sound of the exhaust as well as performance. If anyone has any knowledge of what the design concept is suppose to do and can further explain it more than "smooth out the exhaust" and "keep exhaust gasses from going back up the pipe" I would like to hear it as I am curious. Might get them just to see out of plain curiosity, but still REALLY skeptical to even entertain it. __________________ 2009 PW 370Z Base MT 2009 MB 370Z Touring MT 2014 PW 370Z Sport MT // Z1 Motorsports CAI // Motordyne ART pipes V3 // AAM 2.5" True Dual Exhaust // Fatboy Shift knob (U Matte Bro?) // More to Come!

10-29-2015, 04:08 AM	#2 (permalink)
James10694 Track Member Join Date: Oct 2013 Location: Las Vegas NV Posts: 913 Drives: 2010 370z Nismo Rep Power: 12	Saw those on Facebook. I was curious as well __________________ Boosted Performance Single Turbo 618whp/489 tq

10-29-2015, 07:55 AM	#3 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	"Anti-Reversion chambers" sounds (and looks) like ad-speak for "tuned expansion chambers" to me - but I'm no expert. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

10-29-2015, 09:23 AM	#4 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,868 Drives: 2011 Nismo GM 6M Rep Power: 2684436	Basically there is a cone (funnel) in the pipe. The large end is facing the engine. Think of the exhaust as a sound wave that is traveling down the pipe. As the sound wave comes to a muffler or something else. It sets up a sound wave that is traveling back to the engine (your reversion). If the wave can go back to the engine. It robs power by slowing down the exhaust. The cone stops the wave from traveling any farther in the exhaust towards the engine. Closer to the head, better the results. I've had a set of headers that had the cones just inside the header flange at the engine. I couldn't tell the difference with them. 2011 Nismo#91 and RanRich like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

10-29-2015, 12:46 PM	#5 (permalink)
justcallmeb Base Member Join Date: Mar 2012 Location: Ewa Beach, HI Age: 41 Posts: 29 Drives: 14 Nissan 370Z PW M6 Rep Power: 13	So if it prevents the exhaust from going back up, would it possibly reduce/prevent the hiss that can be heard from other test pipes? __________________ 2009 PW 370Z Base MT 2009 MB 370Z Touring MT 2014 PW 370Z Sport MT // Z1 Motorsports CAI // Motordyne ART pipes V3 // AAM 2.5" True Dual Exhaust // Fatboy Shift knob (U Matte Bro?) // More to Come!

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