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08-20-2004, 08:50 PM | #1 |
Scooby Newbie
Member#: 36299
Join Date: May 2003
Location: New Brunswick Canada
Vehicle:2000 Impreza Wagon green |
homemade headers?
I have a single port 2.2 liter engine and after much reading have come to the dismal conclusion that its not worth spending much money on the engine.
I am wondering if there are potential gains to be had in fabricating a set of equal length headers (or as close as one can get due to the head design). I can do the work myself so cost isn't going to be an issue. I am thinking that if I go to this level of effort I might as well replace the whole exhaust or at least put in a high flow cat. The design goal of this project would be to improve the flow path of the exhaust given that pressure wave tuning is not really an option given the head design. here are some questions for you guys to take a stab at: 1) what size primary tubes should I use? 2" maybe? 2) what length primary tubes might be an intelligent choice? 2) what size should it be after the two tubes merge? I am thinking 2.25"? 3) are the magnaflow high flow cats on ebay worth considering? 5) is this total idea a huge waste of my time aside from the entertainment it provides? Thanks for the help and or criticism.
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08-21-2004, 02:56 AM | #2 |
Scooby Specialist
Member#: 60743
Join Date: Apr 2004
Chapter/Region:
MWSOC
Location: Fargo, ND
Vehicle:'95 Impreza L dirty and on jack stands |
if you enjoy the work its not a waste of time at all. i cant imagine it would be any worse than stock. and if it was just go back to stock. go for it. and tell us all about it.
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08-21-2004, 04:52 AM | #3 | |
Scooby Newbie
Member#: 68614
Join Date: Aug 2004
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08-21-2004, 05:08 AM | #4 | |
Street Racing Instructor
Moderator Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:1989 1989 XT6 |
Quote:
Actually, it seems most people like the sound of an unequal length header, such as the Borla. The equal lengths have a distinct sound people would have to get used to or 'grow to like'. It's not a 'ricey' sound but a different sound. I'm sure not everyone agrees but that's the general consensus that I got from reading a good bit of posts on this subject. |
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08-21-2004, 08:51 AM | #5 |
Scooby Newbie
Member#: 44589
Join Date: Oct 2003
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Tri-State
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headers
Good to see someone is actually doing some custom work instead of bolting on, 2" is way too big though.1.5 or maybe 1.375 might be the best, see how big the head ports are and measure the id of the stock system, bigger is not better as far as na headers go. Use some of your welding wire to measure and "mock up" the bends to get is close as possible.
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09-22-2004, 06:19 PM | #6 |
Scooby Newbie
Member#: 36299
Join Date: May 2003
Location: New Brunswick Canada
Vehicle:2000 Impreza Wagon green |
Well my project has slowly progressed to the point where I practiced welding tube merges on the weekend. I also took off the stock header at the head and measured the exhaust port diameter at the head and also the header diameter next to the head, they are both 1.5". I have read numerous times about the antireversion effect of a step up in diameter from the block exhaust diameter to a larger tube diameter. I realize that bigger is not always better but should I increase over the stock diameter to gain the antireversion effect? I am thinking 1.625" (17% area increase) or 1.75" (36% area increase)? Because the first cylinder to fire on each side of the engine is finishing its exhaust stroke and beginning its intake stroke as the second cylinder is beginning to exhaust would an antireversion cone or step be of added benefit in this situation? Does anyone know the primary tube ID of the 2.5 liter engine? Any further thoughts or ideas are welcome.
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09-23-2004, 04:04 PM | #7 |
Scooby Specialist
Member#: 51642
Join Date: Dec 2003
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TXIC
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Vehicle:2008 WRX WRB |
Might take some ideas from this guy
Well I can't post the link for some reason. However, there is a thread on this topic that is being discussed on the iclub website. Very cool looking custom headers. |
09-23-2004, 05:02 PM | #8 | |
Street Racing Instructor
Moderator Member#: 110
Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:1989 1989 XT6 |
Quote:
2nd, anti-reversion I would think would not be an issue on the exhaust side as it would be at the intake side where the valves are. You are going to have a constant stream of gas coming out of the exhaust ports, which wouldn't allow for exhaust gas to be sucked back up into the cylinder. Also, not going with a wider exhaust piping size will keep velocity high so it wouldn't have a chance to slow down to go back up into the cylinder. That's my take! |
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09-23-2004, 06:35 PM | #9 |
Scooby Newbie
Member#: 36299
Join Date: May 2003
Location: New Brunswick Canada
Vehicle:2000 Impreza Wagon green |
Thanks for the idea to check out i-club, I think the thread you were thinking of was this one (there were t threads about this linked together)
http://www.i-club.com/forums/showthread.php?t=70988 Coincidentally his design is pretty much what I had in mind, I was inspired by the MRT header for the 2.5. He has some incourageing words with regards to power gains as well, although I intend to incorporate a catalytic converter. I think I'm going to go with smaller tubes though to keep up the gas speed as suggested. Last edited by obuerkle; 09-29-2004 at 09:11 PM. Reason: bad link |
11-01-2004, 10:10 PM | #10 |
Scooby Specialist
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Join Date: Aug 2003
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E. Canada
Vehicle:1998 Legacy L |
Link no work any update on the progress? im interested!
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11-01-2004, 10:20 PM | #11 |
Scooby Specialist
Member#: 17548
Join Date: Apr 2002
Location: Land of No Turn Signals
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I'm in the process of working on some custom equal length headers for the 2.2 single port. I have some prototypes made and on my car, but we're still working out the bugs.
Mick |
11-01-2004, 10:24 PM | #12 |
Scooby Specialist
Member#: 62556
Join Date: May 2004
Chapter/Region:
Tri-State
Location: Philadelphia
Vehicle:1995 Fastest EJ18T 13.4@105 Record Run. |
i think i might try a project like this in the summer since i am just learning how to weld. obeurkle, hit me up with a pm or email me at [email protected] with those diameters and measurements. make sure you remove where it says remove. thanks
-Pete |
11-01-2004, 10:29 PM | #13 |
Scooby Guru
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NESIC
Location: Brighton, Ma
Vehicle:2001 White |
keep all of us 2.2 guys updated....and when your happy with your results, if you don't post a sound clip, we'll all hate you.
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11-01-2004, 10:32 PM | #14 |
Scooby Specialist
Member#: 62556
Join Date: May 2004
Chapter/Region:
Tri-State
Location: Philadelphia
Vehicle:1995 Fastest EJ18T 13.4@105 Record Run. |
2.2's rule. Unless they are attached to an 4EAT and leak oil from every orafus possible.
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11-01-2004, 10:40 PM | #15 |
Scooby Specialist
Member#: 41012
Join Date: Aug 2003
Chapter/Region:
E. Canada
Vehicle:1998 Legacy L |
What kind of 'bugs' would headers have?
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11-01-2004, 10:54 PM | #16 |
Scooby Specialist
Member#: 62556
Join Date: May 2004
Chapter/Region:
Tri-State
Location: Philadelphia
Vehicle:1995 Fastest EJ18T 13.4@105 Record Run. |
hmm bugs. well relativly none. if they are done right and the pipe sizing is correct the exhaust stream should be smoother therefore increasing flow and sound resonation. Now with some headers, they crack....i.e. the borlas. I think the single headers will have no bugs at all. But well see.
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11-01-2004, 10:57 PM | #17 |
Scooby Newbie
Member#: 36299
Join Date: May 2003
Location: New Brunswick Canada
Vehicle:2000 Impreza Wagon green |
hey guys the project is still underway but has been sidetracked a bit. I am building a pipe/tube bender to make my own bends for the headers and it is about 60% done. I have the frame completed and only have to make the die's to fit my tune. I'll try to figure out how to post some pictures if anyone is interested. I'm getting laid off on November 12th so after that I will have plenty of time to get back at the project. I'll promise to keep everyone updated.
Owen |
11-02-2004, 12:36 AM | #18 | |
Scooby Guru
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I like your optimism considering the upcoming employment change! I hope the project works out for ya, there's not alot of support for the 2.2. You may find a good design that others will happily pay to have.
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11-02-2004, 01:10 AM | #19 | |
Scooby Specialist
Member#: 17548
Join Date: Apr 2002
Location: Land of No Turn Signals
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Quote:
Mick |
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11-02-2004, 10:33 AM | #20 |
Scooby Specialist
Member#: 41012
Join Date: Aug 2003
Chapter/Region:
E. Canada
Vehicle:1998 Legacy L |
So im assuming that your eliminating the cat with the new headers? Or am I wrong in my assumption of where the O2 sensor is?
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