or, "How I built a car around an Exotic 8 into 1 Exhaust."

[@CriticoolHit]

I could really feel the pain around having to do that to a 67 fastback but honestly I feel we've gained more than we've lost so it's a win.

[@trackdayclassics]

Thanks! I agree. (65 fastback though 😜)

[@Yipe-gm1wp]

It sounds so exotic. I would love to hear an 8 to 1 system on a flat crank V8.

[@GeorgeXian]

Theoretically it would sound exactly the same! With 4-1, what you are hearing is the odd firing of each bank, however crossplanes are even firing when looking at all 8 cylinders. Flat planes are even firing per bank as well.

[@benjurmind1318]

Damn the interior must get hot in that GT350 with exhaust running to the inside 👀👀

[@trackdayclassics]

Yep, my passengers don’t like it either 😜!

[@hansenmotorwerks]

Wow GREAT work! I think I may need to try this.

[@driverjamescopeland]

3:46 - this is the moment where the car guy in me has a coronary and scolds you... and you turn the key to listen to that soundtrack of "I Don't Care" as performed by the You Were Sayings, produced in conjunction with I Forgot Why I'm Here and Automotive Hymnal Exhaust.

[@CHNO-hs6nx]

Gotta love those “area under the curve” gains. Amazing fab work here for sure! Do you run into any heat management issues? Around the doghouse/firewall in particular

[@trackdayclassics]

Thanks for comments! It does get hot, but not as bad as it once was. Ceramic coatings, heat shields, fire sleeve, and reflective sleeves. Especially important around brake and fuel lines, as well as electrical. But to answer your question, my passengers tell me they feel the heat on the their left calf. Cheers!

[@zkseries]

Great job with the video editing! Almost as good as the sound of the headers themselves haha

[@trackdayclassics]

Thanks Z K!

[@tomstamatakos8027]

Totally agree 👍

[@jimmyjckjones]

That is a rather outstanding sound and stunning workmanship. Great job!

[@trackdayclassics]

Thanks! The guys at R.E.F. Unlimited know how to build exhaust systems. Cheers

[@TheycallmeRpCratchet]

I love that rear window. Is that an original?? It makes the car and so does the exhaust. Beautiful job. The sound is breathtaking. I am determined to build one of these headers myself it is the ultimate.

[@trackdayclassics]

@TheycallmeRpCratchet Thanks! The rear windows are available thru Tony Branda. They were specific to the 65 GT350 R competition model (only 36 cars were made). But you can get the window in plexi or lexan. Cheers!

[@TransAmDrifter]

3:40 is the reason why it would perfectly work in a mid engined car.

[@trackdayclassics]

Good call. I agree!

[@superrookie1554]

I finally understand the principles. sounds great

[@trackdayclassics]

Thanks!

[@kage3305]

Wow.. what an extreme process. So worth it though, sounds amazing, it's unique, it's yours. I love it. Can't wait to build my 65.

[@trackdayclassics]

Keep me updated on your progress! Thanks for the comments too!

[@martypoynter9806]

In summary, we wouldn't call this a "bolt-on" mod huh? 😁

[@Jdagstr]

Hello! Found your channel from Maisteer video! This must be the best sounding V8 out there. Damn gj! Pure joy to listen to this engine roar on youtube. I can't imagine how it is in person! :D I must ask. From collector and rearwards. Is it a constant section exhaust. At 12sec into the video I can see it gets larger. Is that a muffler? Best regards

[@trackdayclassics]

Thanks for your question and comments on the sound. It really howls inside the car. And a big “thank you” to Maisteer for crediting my video. This exhaust cone’s up from about 2 1/2” at the merge to 4” all the way to the exit. There is a 4” straight through truck muffler in the middle. Please feel free to share my videos with your friends? It can help the content to get more views. Cheers!

[@L.o.u.i.s..]

Now let's see a 8 to 1 single turbo build and power curve sheet.

[@trackdayclassics]

😳

[@michaelcousins2526]

@@trackdayclassics -- That is exactly what I was thinking while watching this video! I would think that the addition of a single turbo set up to it would be amazing for half mile or even 1 mile airstrip time trials because of the way the power curve is much more linear.

[@trackdayclassics]

@@michaelcousins2526 Sounds like you have a great project ahead. Good luck and let me know how it works out! Cheers!

[@antalamo]

Great informative vid....so much has gone into the design and fabrication of this car and exhaust. Sounds great and that’s from 1st hand knowledge.....!

[@trackdayclassics]

Thanks Tony! I hope your projects are doing well and tell Peter he might have a career in KZbin!

[@josephneloms3033]

This is awesome. I have a question though. Why not build two 4-1 headers in the sequential layout in the video and then join them with a y or x pipe. Would that not come out with the same result

[@trackdayclassics]

I’m not the expert, but to answer the question: the purpose of the sequential 8 into 1 is line the pulses up in line and close together to pull the next one in behind it. This also requires equal length primaries, right? However, look into the 180 set ups of the GT40s in the sixties; close to your idea, but slightly more complicated. Check the 180 out. Cheers!

[@trackdayclassics]

cdn.shopify.com/s/files/1/0003/4085/2755/articles/Bundle-of-Snakes.jpg?v=1682460418&width=1000

[@skullfracture2]

This reminds me of some 80s early 90s drug rehab video, with the different people asking common questions and that watered-down techno music

[@trackdayclassics]

Thanks, I think? I’m new to this, so I had to start somewhere…

[@skullfracture2]

@@trackdayclassics and I didn’t mean for it to be harsh criticism, it’s just a vibe I got from the way the video was put together.🤷‍♂️

[@trackdayclassics]

Yeah baby, yeah! Shagadelic!

[@twine3410]

Worth every thousand dollars it cost. Arguably the sexiest sounding engine since the Cosworth DFV!

[@iunnox666]

Never understood why people like this sound. The rumble of a traditional American V8 is way, way better sounding than this.

[@bobbyshaftoe]

it can lose hp for all I care.. it sounds frigging amazing. Aural Ambrosia

[@trackdayclassics]

Thanks!

[@sc358.]

Pretty cool! I've got a 70 Chevelle I wanna build pro touring with a maybe 9 degree, BBC and 8-1 setup. Think I may split it again into boom tubes like cup cars had. Crazy amount of work. Probably looses some power but should sound really good. Also think I may use different lengths (to even degrees between firing within a given bank, draw it out and you'll see what I mean). But I'd probably take a trip to the engine dyno to test that theory on conventional headers first. Awesome build, haven't ever heard anything like it 👍

[@trackdayclassics]

Thanks! Good luck with your build!

[@iunnox666]

Don't get it. Your Chevelle probably sounds SO much better than this.

[@MR-uk7iy]

me looking at the exhaust then I notice 3 inline pumps lol and what looks like a 9 inch rear, this car is insane.....oh yeah the exhaust right

[@trackdayclassics]

Thank you! Before and after filters for the fuel pump too. Cheers!

[@jamesgeorge4874]

The guy sitting in front of a flathead, asking how an 8 into 1 exhaust works is funny.

[@trackdayclassics]

Thanks! A good sport for doing that piece for me. Cheers!

[@joereyes2632]

I give props for daring to do something out of the ordinary, and on a special car 🍻

[@trackdayclassics]

Thanks Joe!

[@rustynut1967]

Very cool! Great job. I couldn't bring myself to chop up a nice car like that though and the heat in the car. It must require space shuttle tiles in the tunnel to keep the heat down 🥵. A flat plane crank voodoo with conventional headers and individual throttle bodies is my dream set-up. Maybe one day.👍

[@TransAmDrifter]

Does it use unequal tube lengths just like the typical 8-2 headers should have?

[@trackdayclassics]

All equal length (34”) 2” primaries

[@Mrx1080]

@@trackdayclassics Is that primary diameter suitable for the power you're making? I've personally only seen primaries that large on big block setups.

[@trackdayclassics]

The exhaust builder (Greg of REF Ltd) designed the system for my car. I don’t have any expertise in sizing primaries, I only know what was used. Sorry. Cheers!

[@Drunken_Hamster]

Needs a bigger collector. If your normal SET of headers have 2.5-inch collectors, an all into 1 needs a 3.5" collector for equal flow/pressure.

[@tommys2979]

The scavenging effects of these setups arent as restricting as youd think

[@realisrealite5554]

If I was building a car I would think about 8x1.But I'd never cut up a functional car for 8x1.

[@trackdayclassics]

I understand how you feel. It wasn’t an easy decision, but I stand behind it. The good news is it could be brought back to stock, at least that was my way to justify it! And wanting to be different from other cars. Thanks for the comment, Cheers!

[@jonmustang]

If you were to do it again but with a car that has an already-ideal size and layout for x-into-1 headers, what vehicle platform would you choose?

[@trackdayclassics]

Great question. A track only car since so much has to be sacrificed and other things fabricated. Any compact platform including a fox body, S95, or even smaller. You just gotta get creative! Cheers

[@OVERKILL_SS]

Thank you for the video! I'm gonna try to put sequential 8-1's on my 63 F100 we are putting vic suspension and 4.6 in it and I didn't think about ground clearance issues because the stock suspension is higher off the ground, this video helped me realize what I need to consider before we make the engine mounts! Thank you! 🙂

[@trackdayclassics]

Sounds like a fascinating project! Do you plan to share any videos on your progress? I for one, would like to see that!

[@OVERKILL_SS]

@@trackdayclassics Yea I plan too! I don't have a very good recording set-up, but I'm making it work! I hope to have it done by the time I turn 16 in Sept. But money is an issue. Lol

[@trackdayclassics]

Good luck! I’m sure it will be a fun project. Cheers!

[@OVERKILL_SS]

@@trackdayclassics Thanks! It sure is man! Cheers! 😊

[@SystemScandll]

2:18 Is this order, the cylinder position rather than it's order of firing?😊

[@trackdayclassics]

This is both the firing order and the routing of the primaries? Hope that helps to answer your question. Cheers!

[@No_Grip_Racing]

Would this exhaust concept work on other engine types, IE: inline 6, or v6? I think the Audi 5cyl “bag of snakes exhaust works like this, which helps to give it its distinct sound. Thanks!

[@trackdayclassics]

I think that with a well tuned merge collector and equal length sequential routing of the primaries, it couldn’t hurt, right? But I’m no expert, I had an expert build it for me. Cheers!

[@Turtle2117x]

Hello, How big do the pipe diameters have to be? Just like the outlet from the cylinder head? Thank you

[@trackdayclassics]

Mine are 2” x 36” primaries. Cheers

[@jhenukumar]

I want you to make exhaust header for my mazda MX5 ND1, How to contact you and make business

[@trackdayclassics]

Flattered but I did not create this masterpiece. Contact Greg at R.E.F Ltd in Kingman AZ, USA. He is the man you should talk to. Cheers!

[@jhenukumar]

@@trackdayclassics thank you sir. 🫡

[@joe-hp4nk]

Lets see the dyno sheets between 4 into 1 headers and 8 into 1 with the same primaries on the same engine combo.

[@trackdayclassics]

Its in the plans. Hopefully I’ll have a video by the end of summer 👍

[@grady1982]

would be easy to do this to a gt40

[@trackdayclassics]

Yes, perfect car for this exhaust, or most any car with a rear engine V8

[@Mart77]

I can see one more trick in there that you didnt mention. But let's keep it a secret

[@trackdayclassics]

🤫

[@laglord]

I thought the doghouse was for you at home! 🤣

[@trackdayclassics]

Sometimes it is! 🤣

[@LuckyCharms777]

So how did you decide the collector and exhaust pipe diameter? That thing is huge! (That’s what she said. 😂)

[@trackdayclassics]

Recommendations from the 8 into 1 exhaust builder: R.E.F. Unlimited out of Kingston AZ. Way over my knowledge level! (Huge😂)

[@675daytonarider]

Do you have the measurements that you did for the headers? I’d love to attempt this on my small block Ford build.

[@trackdayclassics]

I’ll try. Unfortunately I dont know the math that goes into the building of these. This is my second 8 into 1. The first had smaller primaries and a different angle on the collector. The current primaries are 2” x approximately 34-36” in length. The collector looks to be about 45 degrees. The current setup was built for high RPM (7000 +). The collectors are commercially available, but if you want an expert, I might suggest R.E.F. Unlimited out of Kingman AZ. Great question! Cheers!

[@bobbarker3781]

Facts about performance and skill level to pull it off. Good job

[@trackdayclassics]

Thanks!

[@AbramSari]

Awesome car. Awesome engine. Awesome header. Awesome sound. Awesome fab work. Completely awesome.

[@trackdayclassics]

Thank you sir!

[@GamingByBaka]

Now optimize it even further with a set of ITB's, a head and cam package to match the headers, and an anti-reversion chamber after the collector.

[@trackdayclassics]

I installed piston return springs and blinker fluid. That should help, right? 🤣

[@GamingByBaka]

@@trackdayclassics performance blinker fluid is always an upgrade. Full synthetic right? 🤣

[@iunnox666]

Why would you not use a project car instead of one in good condition? Pure sacrilege.

[@trackdayclassics]

It wasn’t in good condition. It was in perfect condition! 😜

[@stickman-1]

Amazing sound. Worth every second it took to build. Kudos to you.

[@trackdayclassics]

No worries. I’m glad you liked it. Cheers!

[@craigchiddo2794]

Would overall primary tube length make a difference could you put the collector further back say under the cab of a ford ranger and put the collector in the bed

[@trackdayclassics]

Hey Craig, good question. This car has equal length primaries (about 34 or 36”, I forget which) to put the power in the engines sweet spot. Your idea

[@trackdayclassics]

Sounds interesting though. Cheers

[@Yipe-gm1wp]

Would a muffler change the exhaust note?

[@trackdayclassics]

Same sound, just a wee bit less outrageous 😜

[@bullast2046]

Glad it has enough power to carry the giant b@lls it took to cut up that car.. well done, Sir

[@gaelamerijckx]

So it ends into one line after the collector, or does it split up again?

[@trackdayclassics]

A small change down in diameter to about 2 1/2” (Venturi) then back up to a 4” single pipe all the way to the end. One pipe, one exit. Cheers!

[@gaelamerijckx]

@@trackdayclassics thanks

[@92gears]

Thank you for sharing this, while I can't quite fit an 8-in-1 in my current project car, I'd love to find a smaller 68-72 car and do this some day.. and your work's an inspiration !

[@trackdayclassics]

Thanks!

[@dennisyoung4631]

It’s how you get the F.O.R.D. sound…

[@eikodunn]

I’d do a linear collector instead of a radial one.

[@trackdayclassics]

Please to explain, yes?

[@eikodunn]

@@trackdayclassics Long collector with firing order #1 at one end and #8 at the other.

[@trackdayclassics]

Ok. Like a boom tube? Only eight? Would be interested in a link to photos if you have time

[@Drunken_Hamster]

Coming back to this video because I love it so much: If I had to cut the firewall/tunnel anyway, I would've moved the motor and trans combo back first before trying to jam the collector under my armpit, lol. Imagine how it might drive after being converted to front-mid engine like the ole' Cobras and the Daytona.

[@trackdayclassics]

I like how you’re thinking….

[@Aeneas137]

damn, that's a lot of work for a front engine, rear wheel car, I think this would make a whole hell of a lot more sense with a mid engine car like a cayman / Boxster. or a Ford GT obviously that's out of the budget for the most part. but a Daytona coupe or GT40 kit car?

[@trackdayclassics]

I like what you’re thinking…👍

[@jgbalves]

Thats youtube. Simple collection of media, highly informative and MOAR PAWA

[@trackdayclassics]

👍

[@shreddercheez9422]

FRIGGIN WORTH IT!!!!!!!!!!

[@trackdayclassics]

Thanks!

[@eltonv8tao]

I will make a gif with this information ➡1:40, 2:50 😏

[@aviion-wj7ru]

The Collector was near the transmission, will it affect the transmission temperature and shifting?

[@trackdayclassics]

Not for me. The passenger does get a warm leg though! By the way, this was my second 8 into 1. The first one had a smaller collector under the passenger footwell. So if you really want one, it can be done. Good luck!

[@marcbelson7918]

I just found your channel. Bravo, well done!!

[@trackdayclassics]

Thanks! Please feel free to share with your friends! 😜

[@sijonda]

Why not a 180 setup with a crossover and a Y pipe.

[@trackdayclassics]

Depends on what you call a 180. A true 180 would be like those on the GT40s of the sixties. Is that what you meant by 180?

[@sijonda]

@@trackdayclassics Nivlac57 had an exhaust on his Studabaker before it got stolen. He had one cylinder cross over under the oil pan to get them in order before the Y pipe further down.

[@trackdayclassics]

Yes, I’ve seen that. Too bad it was stolen. I’m considering doing a 180 without the y pipe on my 64 Comet build. As to the 8 into 1 on the Mustang , I just love the sound. It can be argued that it is less peaky and has a broader power curve as well as superior scavanging. Cheers!.

[@sijonda]

@@trackdayclassics I'll keep that in mind. I do more reading than anything else when it comes to automotive. My first serious project is my Jeep right now. I'm hoping I get around to swapping in a V8. Which is where my interest in exhaust design is coming from.

[@tomstamatakos8027]

I found your track videos on this set up and HAD to come over her and see how this was built. You and your team did an amazing job!!!! Now I know exactly how I want to set up my mid-engine kit car exhaust!!?😅

[@Amy-dq2lg]

I am by no means any sort of expert on manufacturing or exhausts, but wouldn't it potentially be easier to have the exhausts exit the cylinders on the inside of the v, this would allow for a much less complicated and possibly easier to fit in the car header

[@trackdayclassics]

Thank you for the question Amy. Do you mean that if the heads were properly designed to do this, the exhausts would be where the intake manifold is, and the intake ports were on the outside of the engine? If so, I’ve seen some exotic engine designs that incorporate that idea beautifully, if that’s what you meant. Very very exotic and expensive though. Anyone know of these engines? Thanks!

[@trackdayclassics]

Here is the Toyota/Yamaha co-op H2 engine with an 8 into 1 in the center as you suggested. Very interesting advancement in Hydrogen power for the future: www.carscoops.com/wp-content/uploads/2022/02/Yamaha-Toyota-hydrogen-00001-1024x555.jpeg

[@county_bear9509]

So just out of curiosity, what’s the disadvantage of the spider design? I’m just not quite understanding how big of a difference there is between the two. Plus the spider design would save weight and make installation much easier.

[@trackdayclassics]

Great question. I’m not an engineer or exhaust fabricator. So the following is based on what the experts told me and and my limited research. The spider design does not allow the exhaust pulses to line up evenly. The gaps between each pulse means the scavenging is also uneven. Think of kids holding hands in a line and running along. If the chain is broken, then people get left behind and no one is pulling them along. When the primaries are in firing order, there are no breaks in the chain so the scavenging is much much better. I can see the allure of the spider design because it is easier to build and looks nice and symmetrical. It seems most guys on KZbin try to build them this way, and they may think this works better than typical headers. But the reality is that the spider design is not much better in scavenging than most tuned headers. I’ll admit it still sounds great, but it is not as efficient as a sequential system. It also has a lot to do with the ability of the engine to make big horsepower. In an average engine, they probably wouldn’t make a noticeable difference. I can tell you that my car “ seems” to feel like it has broader useable power, especially coming out of turns. I hope that helps? Cheers!

[@county_bear9509]

@@trackdayclassics thank you bro, it’s much appreciated. My goals are simply to optimize weight and make the car as easy to work on as possible, so spider headers are definitely one of the most effective options for me. But this gt350 sounds amazing, and she runs amazingly. I hope to see more of her! Cheers mate!

[@Roddy_Zeh]

Thank you for the video! Though I'm not an engineer, just an enthusiast, it's always fascinating to read/watch content such as this, and also answered some doubts I had regarding the principles behind the system! A few questions: 1- Even with all the shielding, could the heat in that area right above the transmission affect it? Like, increasing the transmission oil temperature and such... 2- Is it safe to assume that installing the collector in front of the engine would require less work and fabrication too? (Even if just a bit, since it wouldn't require a new firewall and everything, but probably relocating the radiator further up front perhaps, and a new structure in that area?) 3- Not asking the technical feasibility, but just theory...could such system be combined with 180-degree headers for an even more exotic-like sound? Once again, thank you for the video! Insta-subbed. 😁👍🏻

[@trackdayclassics]

Thanks Rodrigo for the subscribe and the questions. I not an engineer, but I will try to answer. The transmission I’m using pretty much works the same as ever, so I don’t know how much effect there is. Many of the GT40s of the 60s and other rear engine race cars ran the exhaust right over the transaxle too. On many of the Ford and Mercury compacts of the era (Mustangs, Falcons, Cougar, Comet, etc) had very little room in front of the engine and that influenced my decision. I didn’t need a radio, AC, or heater for a track day car, so that space was available. Newer cars might be better candidates for the collector in front. Your last question is a real head scratcher. A true 180 usually has the center two cylinders crossing over to the opposite side (again, like the GT40). The 8 into 1 and 180 exhausts sound very similar to me, although I think the (sequential) 8 into 1 is a tad more efficient. I really don’t know how the two could be combined. Thanks for your questions Rodrigo! Cheers!

[@Roddy_Zeh]

@@trackdayclassics Thank you for the answer! Yeah, I remember seeing that exhaust setting in the GT40's and always had these same doubts, but never could find any further information regarding this specific topic. I guess it really did not have any negative impact, or at least it was negligible, otherwise they probably would've tried to do something about it, applying some sort of heat shielding between the transmission and the piping...but to my (limited) knowledge, it's never been done. I also didn't know about that point of the 180-degree setup, regarding the center cylinders...always thought all of them crossed over to the opposite side! Well, in the end, I don't know which setup, 8-1 or 180, is the least complicated, but both surely sound great. And as difficult as they may be, they're both true works of art, just like the system you have in your car, along with all the changes required to fit everything properly. 👏‍ Thank you again, hope to see more videos in the future!! 😎🤜‍🤛‍😎

[@trackdayclassics]

You got it! Thanks!

[@vernonknight5827]

3 X pipes makes a similar sound you tube it!

[@rifleman7313]

How would the performance of an 8 into 1 exhaust system work in a forced induction supercharged (Roots style) engine be expected to be? In the estimated graph of NA engines indicated increased performance in the early rpm range with an 8 into 1 VS conventional exhaust. Much like a supercharger especially Roots superchargers.

[@trackdayclassics]

Great question Rifleman. I don’t personally think there would be much of an improvement by going to an 8 into 1 with forced induction. The 8 into 1 is the best way to scavenge exhaust pulses (IMO). Not sure that would apply with a blower. Thanks!

[@trackdayclassics]

Sorry, just re read this. Would NOT improve a forced induction IMO.

[@803brando]

how far are your steps from flange to collector? and how much of a step? .080 , 0.100, .250? and how many steps?

[@trackdayclassics]

I didn’t build this exhaust, it was built on the car by Greg at Racing Exhaust Fabrication (R.E.F.) Ltd. So I really don’t know. However, I have another video of the exhaust out of the car that might help you: kzbin.info/www/bejne/pGWconmepsSUocksi=28pGn1Alpn93SCL0 Cheers!

[@scottschaefer5291]

Would this work with unequal length headers as well

[@trackdayclassics]

Great question. The answer is probably not. The whole idea is to line up exhaust pulses in firing order. Otherwise you lose the sound and the scavenging benefits. Thanks for the question! Cheers!

[@A.J.1656]

I love it!

[@things_that_click]

Just so good! The car is on another level.

[@trackdayclassics]

Thanks TTC!

[@danielbilhan7220]

Is it crossplane crankshaft?

[@trackdayclassics]

Yes! Nothing exotic

[@danielbilhan7220]

@@trackdayclassics amazing

[@blackrabbit1681]

Can coyote engine make this sound?

[@trackdayclassics]

Yes! It’s all about the collector design, primary length, and routing. Cheers!

[@trackdayclassics]

As a matter of fact, the first one I saw was on a Ford modular engine in the Duralast Trophy Truck.

[@tomaszkraszewski1913]

4:34 to 5:47 music title please :)

[@trackdayclassics]

Certainly. “Press Fuse” by French Fuse. It’s a free to use song in KZbin Studio. There are hundreds to choose from, all free to download. Cheers.

[@acgiaquinto]

Now you just need ITB’s!

[@trackdayclassics]

Wow. Is that a good thing? I couldn’t find the reference….

[@Gus-lu7zw]

Very helpful well explained

[@trackdayclassics]

Thanks Gus!

[@623pat]

Merci for this video

[@trackdayclassics]

👍

[@AndieBlack13]

Have you done any experiments with the surface-area of each individual pipe, to the surface-area of the collector, a ratio of sorts? Let's call it a "CIR" , as in "Collector over Individual Ratio" ...the collector I'm guessing is about 105mm in diameter....each individual pipe at about 45mm. Since this design obviously has more area for all eight pipes than the surface area in the collector., we will mathematically call it "collector divided by individuals" to get a number typically less than one....by my math, & my guesses on the size of things, this thing I just cooked up gets you a CIR of 0.68

[@trackdayclassics]

No Ricardo, I’m afraid I do not have the expertise that you have (never got past Algebra 2 😝). I can tell you the primaries are 2” in diameter and about 34” long. I don’t have the numbers on the collector. Interesting thought…thanks for the comment! Cheers!

[@AndieBlack13]

@@trackdayclassics Well, we have a surface area of the single circular Collector...and we have the surface area of each of the eight pipes combined. Some guy here on YT has done a little experimentation with the angle of the primaries as they turn to go to the collector. In your design at 0:57 , you can guess the angle is about at a Forty-five degree angle. Now this guy is happy with a Fifteen degree angle...but with all eight of your pipes, the size of a medium sized dinner plate before they all converge, a Fifteen degree angle would have the whole thing being about Twenty-eight inches long, or more! Just how long it is really depends on how big the collector is & how steeply the primaries turn to converge together. PS, the sound of your Mustang is just incredible!

[@trackdayclassics]

@@AndieBlack13 Thanks! And you are correct about this collector. The first time I had one built, the collector ran under the passenger footboard and it likely had the 15 degree angle you mention. I still have that collector. When the new one showed up, I asked the builder why it was so short. He said it would help to make it fit. You seem to have a real grasp of this concept. Thanks again for the comments. Cheers!

[@colinbowman8816]

This is a typical crossplane crank motor. kzbin.info/www/bejne/iWGznZx-ecaZjtE So in theory, could any American V8 could sound like this?

[@trackdayclassics]

Yep. 👍

[@colinbowman8816]

I looked, but I couldn't find any others that really sing the same way, even if they have built with a merge collector. Maybe they aren't lining up the exhaust pulses like you did, or maybe there are other variables to consider as well. Did you know what you would get when you started fabrication? Or was it a bit of a surprise?@@trackdayclassics

[@trackdayclassics]

@@colinbowman8816 No surprise as this was my second 8 into 1 built for this car. This first exited under the passenger floor with primaries running under the car. Worked great, but really hard to work on. So I bit the bullet and went All In going through the firewall. Thanks for watching the video. Cheers!

[@kensmechanicalaffair]

Is that 4inch pipe?

[@lancewashington7942]

I got four inches of HAWD pipe Can't help but make this comment 🤣

[@kensmechanicalaffair]

@@lancewashington7942 lmao

[@trackdayclassics]

2” primaries to the collector then 4” the rest of the way

[@snvffxxx]

Weld that collector should have been a pita! Amazing work tho. How much the fact the 8 pipes are routed into 1 affects the sound compared to a traditional 180 degree headers that normally ends in 2 pipes?

[@trackdayclassics]

Thanks! However, the header was fabricated by someone else the exhaust builder uses. My work started from the clamp ring back. If you listen to a true 180 (like the 1960s rear engine GT 40) it has its own unique sound, and would more preferable on any race car that might need repairs at the race. The 180 exhaust would be hard to remove (with the center two pipes from each head crossing behind the engine to other collector)

[@trackdayclassics]

The sound is all about tube diameter, combustion chamber, tube length, and exhaust tuning. With an 8 into 1 built correctly ( that is; with the primaries entering the collector in SEQUENTIAL firing order) it’s a sound that’s really different from off the shelf headers, x-pipes, etc. Thanks for the comment and for viewing the channel. Cheers!