Differance between single and dual port EJ22?

[Mr. Brat]

I am a little foggy on this one, if someone could clear it for me that would be great. I just picked up a 95 impreza 2.2 and the guy i bought it from said I need a single port y pipe. Then lookin around im seeing dual port... I looked at the motor and seen that it has 2 exhaust ports on each head. They are close together, do they collect in the same header? If that be the case the dual port would be to seperate headers on each side of the motor. Did I just figure it out?

[Numbchux]

If that be the case the dual port would be to seperate headers on each side of the motor. Did I just figure it out?

 

I don't know. not sure what you mean by that.

 

 

But, you have dual port. single port just has one port on each head. Which doesn't surprise me, the '95 2.2s are kind of goofy, and have dual port heads.

[idosubaru]

Sounds like miscommunication or the guy just didn't know. Your 95 EJ22 should be dual port heads. Meaning two exhaust ports on the heads, easily noticeable on the exhaust manifold as well. Single port is just one siamesed port like the older EA/ER engines.

[Mr. Brat]

Numbchux- I was refering to having to header pipes on each side of the motor (4 pipes total). Without being at hoome to look at the motor, I think it only had 2 studs at the exhaust port. Do both ports dump into a single head pipe?

 

Gary- Sinlge port would be like the EA81 motor, where there is only 1 port for both cylinders.

 

I have seen headers that have to head pipes the y together and then the left and right side y together then go into the cat. I guess with that it makes me a little confused. I just dont want to buy the wrong head pipes or y pipe. Im still learning as I go with this swap.

[idosubaru]

Gary- Sinlge port would be like the EA81 motor, where there is only 1 port for both cylinders. .

right, that's what i said, was that a question?

Single port is just one siamesed port like the older EA/ER engines.

of course by ER i just mean the front two.

 

The heads have two ports, but the headers quickly converge from 2-to-1 on each side. should be easy enough to find a picture if that would help.

[idosubaru]

I'm not sure what you're asking. Are you wanting to buy the right header? In that case you need to look at the one you're replacing first, that's the only definitive way. If the motor was swapped it could have either or.

 

Dual port manifold for a 95 will look like this:

 

http://opposedforces.com/parts/legacy/us_b11/type_7/exhaust_system/exhaust/illustration_2/

 

Single port EJ22 will look nearly the same except the part that bolts up to the engine will just look like the flange in this picture (keeping in mind everything else is different in this picture, just using this as a reference for what the "port" difference where it bolts up to the head looks like):

 

http://opposedforces.com/parts/legacy/us_b12/type_1/exhaust_system/exhaust/illustration_4/

 

As you can see it funnels/converges very quickly from 2-to-1 pipe right out of the head. Look at the first couple inches and it's obvious. And yes you can count bolt holes too.

[Gloyale]

Buy a header for a 2.5 anything.

 

It will be dual port.

 

Honestly, I don't even think you will find headers for sale for single port, so don't worry so much.

[Mr. Brat]

Gary- its like the first one that you sent me. Has dual ports the collect into the same header. The picture summed it up for me just fine. Thanks