Open headers. (yes, I know it's bad)

Dansby · March 19th, 2009, 06:03 PM

But how long can I drive with open headers without causing to many problems to the engine?

itschristorres8 · March 19th, 2009, 07:28 PM

running open header will burn your exhaust valves
theres no time refference to refer to
the longer you go the worse your valves get period

TN.Frank · March 19th, 2009, 08:43 PM

Originally Posted by itschristorres8

running open header will burn your exhaust valves
theres no time refference to refer to
the longer you go the worse your valves get period

I've heard this before but you have to ask yourself, logically, does this make sense? Having an open header will put the cooler outside air closer to your exhaust valves, so when have you heard of cool air "burning" a valve?? I see a lot of drag cars running what pretty much amounts to an open header and they're valves are fine. Unless you can point to some hard data showing that exhaust valves will be burned I pretty much think it's a myth.
Of course the car will be LOUD as hell and you'll throw codes from your downstream O2 sensor but I don't see how it'll hurt anything.

P.S.
Just to let ya' know that I'm not talking trash, here's a couple links.
Will it hurt the car any if you have open headers? - Yahoo! Answers
Engine & fuel engineering - Open Header = Burnt Exhaust Valves? Myth?

wannabeimportkiller · March 19th, 2009, 10:38 PM

^You have to remember this fact. Drag cars with "open headers" which is basically what they are yes, anyways they are only running that quarter/eighth of a mile then cutting the car off, then the motor gets rebuilt. So its not the same thing as driving a car daily. But like i was saying its just a thought.

WLJohnson05 · March 19th, 2009, 10:42 PM

Originally Posted by wannabeimportkiller

^You have to remember this fact. Drag cars with "open headers" which is basically what they are yes, anyways they are only running that quarter/eighth of a mile then cutting the car off, then the motor gets rebuilt. So its not the same thing as driving a car daily. But like i was saying its just a thought.

thats exactly right. the valves on the street cars need a certain amount of backpressure to work right. when u have open headers u kill that back pressure

wannabeimportkiller · March 19th, 2009, 11:04 PM

Booyah win for me lol

WLJohnson05 · March 19th, 2009, 11:20 PM

more specifically the track cars generally run in that higher rpm range too where the open header concept will help, but our cars run in a relatively low rpm range which makes the opposite effect of hurting torque.

Dansby · March 19th, 2009, 11:26 PM

Alright, only reason I asked is because I took my exhaust off tonight...well, the catback, so right now I'm just running with the o/r x.

Onemanzu · March 20th, 2009, 01:03 AM

Originally Posted by Dansby

Alright, only reason I asked is because I took my exhaust off tonight...well, the catback, so right now I'm just running with the o/r x.

you should be fine with a mid pipe on, as long as you are getting the scavenging and everything.

Cudascious · August 18th, 2010, 05:46 PM

Actually it is velocity you want, not back pressure. The reason valves get burnt is because the engine runs leaner with open exhaust or a straight through exhaust, because there is no back pressure to to build up and have the engine working against, therefore more air is drawn in and your air fuel mixture becomes lean, if richened up properly it will achieve close to optimal 14.7 A/F ratio again and no burned valves. Back pressure being needed for torque is a myth. Ideally velocity will help the engine make power but back pressure will hurt power.

6Stang99 · August 18th, 2010, 06:58 PM

Really old thread man. I think the discussion is over. lol

clidefr0g · August 18th, 2010, 07:04 PM

new ppl need to L2 dates, and not just go back 50 pages and start posting lol

ESG-642T · August 18th, 2010, 07:12 PM

Gah noobs!!!

i-bought-a-v6 · August 18th, 2010, 08:22 PM

Bump

F8L GT · August 18th, 2010, 08:35 PM

Originally Posted by i-bought-a-v6

Bump

Why did you bump this thread?

March 19th, 2009, 06:03 PM	#1
Dansby Hardcore Enthusiast Join Date: Mar 2007 Location: Orange, Texas Posts: 2,285 iTrader: 1 reviews	Open headers. (yes, I know it's bad) But how long can I drive with open headers without causing to many problems to the engine?

March 19th, 2009, 07:28 PM	#2
itschristorres8 Banned 00 V6 & 09 GT 13.37@104.4mph--BONE stock GT Join Date: Aug 2006 Location: south florida Posts: 15,806 iTrader: 2 reviews	running open header will burn your exhaust valves theres no time refference to refer to the longer you go the worse your valves get period __________________ [SIGPIC][/SIGPIC] Acmillr loves me

March 19th, 2009, 10:38 PM	#4
wannabeimportkiller Hardcore Enthusiast 2012 Race Red GT/CS Join Date: Feb 2007 Location: Belmont, NC Posts: 2,101 iTrader: 0 reviews	^You have to remember this fact. Drag cars with "open headers" which is basically what they are yes, anyways they are only running that quarter/eighth of a mile then cutting the car off, then the motor gets rebuilt. So its not the same thing as driving a car daily. But like i was saying its just a thought. __________________ 2012 Race Red GT/CS 98 GT-Gone NCMM ORIGINAL

March 19th, 2009, 11:04 PM	#6
wannabeimportkiller Hardcore Enthusiast 2012 Race Red GT/CS Join Date: Feb 2007 Location: Belmont, NC Posts: 2,101 iTrader: 0 reviews	Booyah win for me lol __________________ 2012 Race Red GT/CS 98 GT-Gone NCMM ORIGINAL

March 19th, 2009, 11:20 PM	#7
WLJohnson05 MM's Database Error 2004 Mustang V6 322.8 rwhp Join Date: Mar 2007 Location: VA Posts: 13,285 iTrader: 9 reviews	more specifically the track cars generally run in that higher rpm range too where the open header concept will help, but our cars run in a relatively low rpm range which makes the opposite effect of hurting torque. __________________ I'm trying to get rid of this stuff, feel free to make me an offer!: SCT Mass Air Flow Sensor $200 Tial Wastegate Springs $40 (10psi and 3.6psi)

March 19th, 2009, 11:26 PM	#8
Dansby Hardcore Enthusiast Join Date: Mar 2007 Location: Orange, Texas Posts: 2,285 iTrader: 1 reviews	Alright, only reason I asked is because I took my exhaust off tonight...well, the catback, so right now I'm just running with the o/r x.

August 18th, 2010, 05:46 PM	#10
Cudascious Newbie Stock 1983 Mustang GL 5.0 13.78@96.26 Join Date: Jun 2010 Location: Idaho Posts: 12 iTrader: 0 reviews	Actually it is velocity you want, not back pressure. The reason valves get burnt is because the engine runs leaner with open exhaust or a straight through exhaust, because there is no back pressure to to build up and have the engine working against, therefore more air is drawn in and your air fuel mixture becomes lean, if richened up properly it will achieve close to optimal 14.7 A/F ratio again and no burned valves. Back pressure being needed for torque is a myth. Ideally velocity will help the engine make power but back pressure will hurt power. Last edited by Cudascious; August 18th, 2010 at 05:48 PM.

August 18th, 2010, 06:58 PM	#11
6Stang99 Hardcore Enthusiast 2000 Jeep Grand Cherokee Join Date: Apr 2010 Location: West Milford, NJ Posts: 1,202 iTrader: 2 reviews	Really old thread man. I think the discussion is over. lol __________________ Cammed '99 Mustang V6 -- Sold Supercharged '89 Hatch -- Sold Looking for a project Stang now... MILITARY CREW - TERMINAL LANCE - MARINE CORPS. INFANTRY www.wotmustangs.com

August 18th, 2010, 07:12 PM	#13
ESG-642T [8MINUS2] 2002, Ford, v6 Join Date: Feb 2007 Location: TEXAS Posts: 12,317 iTrader: 0 reviews	Gah noobs!!! __________________ Hi, You can call me Kyle Random ESG fact: Had a prochamber on his v6 before it was popular. WTB: v6 BBK valve covers

August 18th, 2010, 08:22 PM	#14
i-bought-a-v6 Banned 2002 Auto V6 Several Seconds Join Date: May 2010 Location: NY Posts: 1,096 iTrader: 0 reviews	Bump __________________ [U]Specs[/U] 351W EFI with 2 cylinder delete [U]Mods[/U] Catted dual exhaust with Flowmaster 40's H-piped $60 XM with no subscription Savings Account Mod $00000.00 [U]Future Mods[/U] None [COLOR="Red"]Put This Immature Crap Back In Your Sig, And You'll Be Taking A Vacation. Love, TheUNZippee!T[/COLOR]

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