|
|
Item Posts
Sort Order
|
|
|
 Custom headers
|
|
Posted: 11/26/05
02:13 PM
|
|
I need to build a set of custom headers, but i need some instructions and a material list for the block connection end of things if anyone has it. Thanx
|
|
|
|
El_Jefe
Enthusiast
| Posts: 303
| Joined: 09/05
Posted: 11/28/05
12:05 AM
|
|
for what car?
|
|
|
|
|
Posted: 11/28/05
02:30 AM
|
|
Actually, It's an '85 Ford Ranger w/ a 2.3L I-4 and I want to run full dual exhaust from headers.
|
|
|
|
|
|
66Elco
Enthusiast
| Posts: 691
| Joined: 03/04
Posted: 11/28/05
06:11 AM
|
|
you can't get full duals because you only have one exhaust side...and splitting the exhaust will only lower performance...
|
|
|
|
|
Posted: 11/28/05
01:57 PM
|
|
just out of curiosity why would it lower perfomance?
|
|
|
|
66Elco
Enthusiast
| Posts: 691
| Joined: 03/04
Posted: 11/28/05
03:16 PM
|
|
because theres more pipe, the gasses will cool and slow down.
|
|
|
|
|
Posted: 11/28/05
06:42 PM
|
|
oh, ok so than why do v8's run dual pipes most of the time. I mean couldnt they have one very large header that came all the way down to one pipe. And also wouldnt that defeat the purpose of a 4 to 2 to 1 header?
|
|
|
|
|
Posted: 11/28/05
07:15 PM
|
|
Quote:
oh, ok so than why do v8's run dual pipes most of the time. I mean couldnt they have one very large header that came all the way down to one pipe.
First things first... it would lower performance due to lowering the amount of backpressure in the exhaust. You need a certain amount to achieve optimal exhaust gas removal from the cylinders. The more spent gases you have lingering around in there, the lower the performance.
Now... as for V6/8 plants.. these motors have spearate banks of cylinders. Each bank needs a separate exhaust manifold or header to evacuate waste gases. Since they are running their own pipe on each bank of cylinders, there's no need to dump into one. Doing so would actually upset the balance of the sound waves traveling down the exhaust tubes and decrease the ability for vacuum pressure to evacuate the spent gases.
Quote:
And also wouldnt that defeat the purpose of a 4 to 2 to 1 header?
No. A properly designed header of any variety (4-2-1 or 4-1) will increase performance due to being of a lower restriction and smoother inside the exaust tube itself. Less friction for the gases to collide with equals better performance. The header really has no job other than to direct the spent gases out from the motor. It's the exhaust portion after the header/manifold that more directly affects backpressure. You can also affect the power negatively by running an exhaust that's too big on a small displacement, naturally aspirated motor.
|
|
|
|
|
Posted: 11/29/05
09:01 AM
|
|
oh ok thanks 
|
|
|
|
|
Posted: 12/04/05
01:58 PM
|
|
OK, I may be showing either ignorance or overexuberance here, but why couldn't I take two cyl. on 1 header, and the other 2 on the other and just run a pipe w/ half the volume?
|
|
|
|
|
Posted: 08/11/09
12:25 PM
|
|
You could do it how ever you wanted. But doing dual 2-1's all the way back would make you lose power due to backpressure. v-8's run duals because they have twice the motor that you do. They usually run dual 4-2-1's all the way back.BUT if you had your heart completely set on dual exhaust for your truck and you're doing it yourself... I would run the two mid pipes to 1 then the two end pipes to 1 then have them run to 2 seperate hi-flo cats, make sure to get the fitments for your O2 sensors. Then after your cats, run your two pipes to a "X pipe" to get your back pressure right (or better). Then run that out to your 2 mufflers. That would probably do you justice... ALSO i would run slightly smaller pipe like 2 1/4.. that would be the BEST way to run dual exhaust with the most gains with a 4 cylinder. (Look up X pipe.)
|
|
|
|
|
|
|