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Home > Performance Mods > Exhaust > Header and NOT Headers

Header and NOT Headers

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Web Reg'd: Apr 17, 2006 THE SHADOW	Ok, I just want to clear this issue up for everyone on here and hopefully all the new members that come in: *WE DO NOT* HAVE HEADERS! A 4 cylinder engine has 1 exhaust side on the engine block. In that location, there can either be a header or cast manifold. A header has individual runners (tubes), 1 for each exhaust port, and runs down into a collector. A cast manifold has individual openings for the exhaust ports but is one large manifold that collects the exhaust all at once and forces it into the downpipe. Header example: note the individual tubes running the length of the header* Cast exhaust manifold example: *note the short, blocky style of the manifold Now, there are also 6 cylinder engines that have 1 exhaust header/manifold as well. Example is: Inline 6 cylinder 4.2L in older Jeeps. They only have 1 exhaust side to the block which means they only have 1 HEADER. Flat 4 cylinder engines (WRX engines) are different. They have headerS b/c the engine is setup differently. There are 2 exhaust sides to the block b/c of the way the pistons are positioned to collide against one another rather than against the top of the combustion chamber. In cases like this, THEN and only then it is correct to say Headers. V engines and W engines have multiple exhaust exits so they also would be properly called HEADERS. There are a few odd engine setups (flat 4 being one of them), but please...............IF YOUR CAR HAS 1 EXHAUST SIDE, YOU WILL BE ORDERING A HEADER..........NOT HEADERS! Thanks for reading and I hope this helps educate some new tuners so they are not flamed immediately by people who know the difference. Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 09, 2007 10:56am
Vicious Reg'd: May 03, 2005 El Chupacabra	Great reminder about headers.. or is it header? I'M SO CONFUSED!!!!! The Thread Killah
[#] Apr 09, 2007 11:06am
Web Reg'd: Apr 17, 2006 THE SHADOW	hahaha......HEADER! Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 09, 2007 11:07am
Mayo Reg'd: Feb 14, 2007 *The Guru*	Ahh I get it, so we got headers right? . . . . . Haha, just playing. We got a Header. Got it. So on the site Ive seen I think 2 pics of a tC with dual exhaust. Those tC's would have headers right? And its a little off topic, but whats the difference between Flat 4 (WRX), and Inline 4(tC)? (Wikipedia's explaination was too confusing ) "gonna wash my car before i take a nap.. can't rest well knowing i've got the entire cast of A Bug's Life on my bumper" - Vicious -- Want to post a "For Sale" thread? Check out the rules first.
[#] Apr 09, 2007 11:23am
Vicious Reg'd: May 03, 2005 El Chupacabra	No no no Mayo.. tCs with dual exhausts would still have a single header. For you see, while dual exhausts would have TWO exhaust tips, the fact that they still only have one exhaust manifold still remains true So you can still only put one header for the engine. There's a single pipe that comes down from the header and the midpipe but is then seperated by what we like to call in the exhaust world: a Y-pipe. Which basically splits the exhaust gases between 2 pipes and is then exited from the dual exhaust tips. Now as for the different between boxer and conventional inline 4 I think it deals with the way the cylinders are placed.. inline for is like this: O O O O <-- cylinders and boxer style is like this : O O O O I could be wrong.. and yes, my diagrams rock The Thread Killah
[#] Apr 09, 2007 11:29am
Mayo Reg'd: Feb 14, 2007 *The Guru*	Ahh cool thanks Vicious. So they dont make something like this?: OOOO <-manifold \/\/ \|\|\|\| o o <-exhaust tips Didn't work the first time, had to edit it. God I hope that comes out well in the post. That would use 2 headers, each with 2 pipes. They wouldn't all collect together, only 2 would collect together. Cause otherwise, those dual exhaust would really be dual exhaust would they? "gonna wash my car before i take a nap.. can't rest well knowing i've got the entire cast of A Bug's Life on my bumper" - Vicious -- Want to post a "For Sale" thread? Check out the rules first.
[#] Apr 09, 2007 11:39am
Web Reg'd: Apr 17, 2006 THE SHADOW	No, a 4 cylinder with 1 exhaust section will not have TRUE duals...........as Vicious said, it's a single pipe split into two near the exit. True duals are on dual manifold vehicles, but only if they make it that way. Dual manifold vehicles can also have headers but 1 exhaust pipe. Just depends on how they want it to exit. Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 09, 2007 11:45am
Vicious Reg'd: May 03, 2005 El Chupacabra	Sheesh, now you've done it. I had to bust out my 1337 MS Paint skillz y0 fo'sho Dual Exhaust On An Inline 4cyl Motor Diagram The Thread Killah
[#] Apr 09, 2007 11:50am
Web Reg'd: Apr 17, 2006 THE SHADOW	ooo pretty Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 09, 2007 11:51am
Vicious Reg'd: May 03, 2005 El Chupacabra	It's my best work ever The Thread Killah
[#] Apr 09, 2007 11:53am
Web Reg'd: Apr 17, 2006 THE SHADOW	Here's a little more colorful diagram: Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 09, 2007 12:13pm
aDelcoTc Reg'd: Jan 25, 2007 Scion Guru	god job web. this is something that def need to be cleared up. yeah, an inline engine can have a "dual exit exhaust" (like the awesome drawing above), but like web said, it is really only split towards the end. a real dual exhaust on a V engine makes it so that each header has its own exhaust pipe. i guess theoretically , you could make a real dual exhaust on a I4 simply by using dual 2 port headers, but that wouldn't be very efficient... and yeah, flat/boxer engines are arranged so that the pistons are horizontally opposed, so that the exhaust ports are on the opposite sides of the block from each other, which the intake manifold is on top. therefore, you need 2 headers, one for each of the 2 exhaust ports on each side of the block. that said, why don't we see more Twin turbo boxer engines?? Scion tc: Its essentially a 2 door Camry that spins up the tires quicker.....
[#] Apr 09, 2007 12:17pm
Web Reg'd: Apr 17, 2006 THE SHADOW	eh, 2 turbos are not necessarily better than 1........remember Del?... Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 09, 2007 12:18pm
Web Reg'd: Apr 17, 2006 THE SHADOW	bump for the night folk Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 09, 2007 09:32pm
Mayo Reg'd: Feb 14, 2007 *The Guru*	aDelcoTc wrote: i guess theoretically , you could make a real dual exhaust on a I4 simply by using dual 2 port headers, but that wouldn't be very efficient... Ah-ha! So it is possible! Siiiiick. By the way, nice schematics guys. I think Ill use em as my background. Haha. "gonna wash my car before i take a nap.. can't rest well knowing i've got the entire cast of A Bug's Life on my bumper" - Vicious -- Want to post a "For Sale" thread? Check out the rules first.
[#] Apr 09, 2007 09:59pm
de16 Reg'd: Feb 07, 2007 Chief Mechanic	it's "Header" its just people says headers. i make that mistake sometimes also. lol
[#] Apr 10, 2007 01:46am
Vicious Reg'd: May 03, 2005 El Chupacabra	Mayo wrote: aDelcoTc wrote: i guess theoretically , you could make a real dual exhaust on a I4 simply by using dual 2 port headers, but that wouldn't be very efficient... Ah-ha! So it is possible! Siiiiick. By the way, nice schematics guys. I think Ill use em as my background. Haha. In the auto world, anything's possible with enough money The Thread Killah
[#] Apr 10, 2007 02:11am
aDelcoTc Reg'd: Jan 25, 2007 Scion Guru	Web wrote: eh, 2 turbos are not necessarily better than 1........remember Del?... right, but the simple fact that the manifolds are on opposite sides of the block (like a V6/Vwould mean you would need less plumbing (and therefore have less lag) to build the turbo manifolds and system. my only theory is that perhaps using only 2 exhaust ports wouldn't provide enough flow to spool up a decent sized turbo... Scion tc: Its essentially a 2 door Camry that spins up the tires quicker.....
[#] Apr 10, 2007 06:57am
Web Reg'd: Apr 17, 2006 THE SHADOW	^true.......2 ports may only put out enough on each side to do the same job as 4 ports on one side, hence the single turbo. Who knows......just have to wait and see if this ever is done. Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 10, 2007 08:59am
aDelcoTc Reg'd: Jan 25, 2007 Scion Guru	just found out some subie legacy's actually use a TT flat 4 setup... hmmm. neva know'd dat. apparently, the TT setup in the B4 rsk legacy delivers power more sublty and linearly that the single turbo setup in the WRX/Sti. proving once again, that bigger single turbos > smaller twins and obviously porsche uses TT designs on horizontally opposed flat/boxer engines too. Scion tc: Its essentially a 2 door Camry that spins up the tires quicker.....
[#] Apr 10, 2007 09:55am
Web Reg'd: Apr 17, 2006 THE SHADOW	hhmmmm, interesting.......... Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 10, 2007 10:04am
aDelcoTc Reg'd: Jan 25, 2007 Scion Guru	web---found this thread on SL. isn't this your header, with just a different brand name?? http://www.scionlife.com/...rder=asc&&start=0 Scion tc: Its essentially a 2 door Camry that spins up the tires quicker.....
[#] Apr 11, 2007 01:00pm
Web Reg'd: Apr 17, 2006 THE SHADOW	Yup..........a lot of generic names are out making the 4-1 header design for the tC. It's simple bending and has been proven through Alphawerks to get some good numbers for the power curve of the tC. Mine are HPR, but OBX, Invision.....they are all the same. I have no complaint with the one I got. 25K+ on it and it still is working great with almost no rust at all....weird for how much salt we had. Normal purplish discoloration of stainless steel but that's it. I'm taking it off when I get my heat paint and coating it after using naval jelly to strip it of any greases and or rust Ignorance is bliss....305 fo life!...haha...Poser
[#] Apr 11, 2007 01:07pm
MrScion07 Reg'd: Sep 09, 2006 Godlike Advisor	Got Head er ssss
[#] Apr 11, 2007 01:25pm
ScionTc59 Reg'd: Aug 10, 2007 Tire Changer	I am looking for a street legal header that will bolt directly to the 1st cat. Anyone? Many thanks!
[#] Aug 17, 2007 12:56pm

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