Retro Header Build-Off Part 5: Building an Anti-Reversion Chamber

Now that you have seen how the header was built, we are going to move on in the exhaust system and complete the next part. In the earlier episodes, Aaron kept hinting that he was going to use "secret torque magic" for the header build-off. He reveals on this episode that it is the Anti-Reversion chamber - he explains how it works and how to make one. We also cover the Flex, Mid-pipe and Catalytic Converter installation.
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Be sure to check out the Speed Academy channel to see what Jay is up to and how they build their header:
► • Celica Beams 3SGE Head...
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Parts used on this exhaust system (Vibrant Part Numbers)
Header:
4x 2603 U-J 1.75" Mandrel Bend
2x 10350 1.5" - 1.75" Collector
6x 10340 Spring Tab Kit
4x 2601 U-J 1.5" Mandrel Bend
1x 10352 1.75" - 2" Collector
Anti Reversion Chamber:
1x 2686 2"-2.5" Reducer
2x 2630 2.5" - 3" Reducer
Exhaust:
3x 1490 2.5" V-Band Assembly
1x 60804 2.5" Flexible Coupling
1x 7525 GESi Catalytic Converter
1x 2641 2.5" Straight Tubing
1x 11898 Exhaust Hangers
1x 1188 Saddle Style Weld-on O2 Bung
1x 1118 Street Power Muffler
3x 13040 2.5" Mandrel Bend 90 Degree
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[@NickKautz]

What he made there is called a merge collector. The cone shape is to allow scavenging (negative pressure waves) to occur over a longer duration per pulse, which adds power over a broader rpm range compared to a standard collector which causes a stronger but shorter duration negative.

[@anamgguy3794]

Can you talk about what this does for turbo applications, the Pagani Huayra uses these in place of mufflers

[@everydayirace]

Bad ass work, thumb 👍

[@RobertKohut]

Never heard of a chamber like that for 4 stroke engines. It seems to resemble a 2 stroke technology for controlling exhaust pulses.

[@TheForcedinductn]

Cool stuff but I thought anti reversion chambers were supposed to be as closed to the exhaust ports as possible, is that not the case? For those that don't know, anti reversion chambers also help with engines that have a lot of exhaust valve overlap, the chamber helps keep exhaust gases from being sucked back into the cylinder during the intake stroke.

[@getweir_d]

yes, directly at the head would be the ideal location. packaging prevents that in this application. I've seen other fabricators have success gaining torque placing them post collector on n/a headers. there is a lot of math involved to maximize the potential of the chamber. the intent here is to encourage people to try new things and learn by doing.

[@phoneuser3569]

FORCED-INDUCTN A proper pulse tuned exhaust does not need them.

[@TheForcedinductn]

Aaron Weir Super cool, I didn't realize they would work that far down, awesome work! @ Phone User, interesting, makes sense too.

[@mike.135i]

so much about exhaust i didnt know, can u put these chambers on any natural aspirated car like an e46 straight 6 BMW or is it just for certin cars where this chamber will be beneficial?

[@tomscustomshop]

Like it!

[@unijabnx2000]

I would love this guy to build a full exhaust for my 370Z pretty please!!

[@todd5082]

Great welds! Heat sink idea is brilliant. The 1980’s porn music not so good.

[@secularsunshine9036]

*"Our Hearts bring back the Light."* Wishing you all a Wonderful Winter Solstice. A traditional celebration dating back well over 5000 years ago where the Sun is literally rebirthed in the passageway of an ancient tomb. "The Grand Passage Tomb." A World Heritage site. Witness the rebirth in person. A celebration of life and renewal, peace and camaraderie with food, song, dance, drink and goodwill. Happy Holidays. Let the Sunshine In... *Be Happy* "Solstice Night by S J Tucker"

[@ze_german2921]

What schedule pipe do you use for the headers and the rest of the exhaust? I see SS turbo Headers used SCH 10. Do you use thinner tubes for N/A aplications?

[@hipjr832]

Yeah, if you're running an NA build then there's no point in having thick piping such as (Sch 10, 40) it'd be best to use thin wall tubing

[@LikeZO]

@2:44 Wish I could say the same of my welding lol.

[@RobertKohut]

Nice! I see the Speed Academy boys have reverted to your method of fabrication. I guess their "digital wizardry' can't work any more...LOL

[@daos3300]

it looked like such a colossal and unnecessarily overcomplicated timewaste..

[@Cannibeasty]

Hey Vibrant, I need advice. What schooling (degrees or certs) would I need to have a job in a speed shop like this? What does the career path look like? Thanks in advance!

[@RacecarAndChill]

Great question. Hoping they answer.

[@krazed0451]

.

[@ryanfulkman]

william ulibarri, start with vocational schools. Learn welding and automotive.

[@piHi-lg8pl]

I work at a speed shop and I have had zero schooling.... teach yourself and get skilled trade jobs and look at college to expand your people base

[@MrLister30]

Hi William, that's a great question. The most important thing is you need is passion for the industry. I am one of the technical staff at vibrant along with Aaron and Jay. We all have completely different backgrounds, Jay is self taught, Aaron has a machining background and I am an engineer. We all bring different expertise to the table, but we all share a deep passion in racing, automotive design and fabrication.

[@tape2199]

The part that you slid inside the cone should've went outside of the cone because you're interfering with scavenging unless you butt connect the two together and weld it. Whenever you're connecting a piece to the exhaust going outward you always slide it over the previous piece.

[@Rigohm]

Would an anti-reversion have benefits on a turbo set-up (assuming it's after the turbo outlet or down pipe)?

[@brandythompson528]

Rigo Hernandez don't think so. The exhaust would have to come back through the turbo, which I don't think is possible.

[@getweir_d]

no, there is not a significant benefit in a turbo application as all the pulse waves are disrupted by the turbine wheel.

[@piHi-lg8pl]

The best exhaust after a turbo is a laminar bell which is super short and would change shape depending on the variations in flow. It's kind of like how rockets loose parts as they change altitude the thrust cone(bell) keeps the correct burn happening for max thrust but on a turbo it's going to be reversed where we will take the pressure coming out of the turbo and try to diffuse it with the greatest pressure transition possible without inducing more turbulence.

[@gpggarciano2234]

whats the use of the Anti-Reversion Chamber? can some shed some light over here please...

[@brandonjones5808]

Where did you get the background music, because it sounds like my classic disco set 1 that I posted on my soundcloud my name is J.Golden Productions

[@sxs4l245]

Porn Pop .....

[@GUILHERMERSTEFENON]

Sigma kids - bella mi amoir

[@Fenrasulfr]

A set of webers would finish the look of an oldskool sportscar engine.

[@lilflatty2472]

Why not use a rotary fixture? It makes the process so much easier and consistent.

[@pirsq314]

Why does a 2002 need a cat? They never came with one so why add the exhaust restriction?

[@VibrantPerformanceTV]

That's a great question - There were a couple of reasons when considering adding the GESi Catalytic to this vehicle. Firstly, yes - the car is old enough to not have any emissions regulations by the government, however we have tested these catalytic converters in the past on naturally aspirated vehicles and have actually seen an increase in horsepower when adding them (refer to our video 'How can a Catalytic Add Horsepower?' kzbin.info/www/bejne/a2fSfYmdpdyCd9U). Secondly, Art requested to add the cat because he wants to have an enjoyable experience when driving the car on the street - by having cleaner air coming out the pipe, eliminating the smell, etc. Lastly, the whole exhaust has V-Band connections will allow him to switch the catted section with a catless midpipe or even put on straight piping off the header all the way back if he decides to track the vehicle.

[@TheEldukerino]

I was under the impression that carburated vehicles do not run efficiently enough to use a cat. I have thought about putting one on my car (Datsun 510 with side draft Mikuni's) but have heard that the cat would overheat and break down very quickly. Are the GESi Cats able to handle the variations in AFR that carbs present?

[@ReidHenderson]

@@TheEldukerino I don't understand why either. But I know some cats have a metal core catalyst so they can handle extreme heat and richer running vehicles better. But the carb would still probably wash all the catalyst of the substrate then its not much of a convertor anymore just a muffler.

[@skippy2987]

@@VibrantPerformanceTV This could only be because adding a slight restriction there benefits the pulse tuning. High performance honda guys have discovered that "high flowing" the cat reduces power, not realising honda know what they are doing when they release an emissions legal 100hp/litre engine. You'd almost certainly note the same gain in power with a piping size step-down then step-up in the same place.

[@HondaTrumpAi]

@@skippy2987 Got a 100 cpi metallic core cat on A k24 still today. Thank you

[@waltmucha2499]

Anti reversion chamber. Is this like dv’s chamber?

[@truthseeker8483]

Who sells these exhaust sections again????? Don't forget a silencer or two....maybe a resonator??

[@00duce84]

where is the background music from?

[@GUILHERMERSTEFENON]

D Rell bella mi amoir -sigma kids

[@darceedarcee]

Doesn't that bother you that the vibrant merge bottle necks the flow so much??

[@AdamKyleAnderson]

So you build a nice free flow exhaust and then go stick a massive restricter ( CAT ) in the middle. DOH!

[@VibrantPerformanceTV]

Refer to our video regarding out GESi Catalytics: kzbin.info/www/bejne/a2fSfYmdpdyCd9U

[@thebavariancircle5105]

Trust me, I’m a tube engineer..... 🤦🏻

[@daos3300]

looks nice, but do you have any math to back it up?

[@evanmastermind]

Black bars = cinematic.

[@CharleswoodSpudzyofficial]

Man this guy can weld

[@sxs4l245]

This is not a working mans exhaust. I would probably have to take a second job. STEP back son, I got this....

[@GUEST-qw4te]

Iirc. Your anti reversion part is at the wrong end.

[@goclunker]

Omgherd itr a 2002trrrree

[@briguy91931]

You could cut out half the work by doing a side exit!!! Mwahahahaha!!!

[@phoneuser3569]

Lol anti reversion chamber and a CAT.........wtf dudes.