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Guest Message by DevFuse
 

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ej22 headers?

brat swap

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14 replies to this topic

#1 barracuda423

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Posted 08 November 2013 - 10:52 AM

hi i just bought a 1986 subaru brat with a 1.8 carbureted engine. i was looking for a non catalytic converter y pipe but cant find anything, i was wondering if a uel single port headers from a 2.2 or a 2.5 would work with this engine

 

 

~Zack 



#2 ford'ssubaru's

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Posted 08 November 2013 - 11:43 AM

I may be mistaken but what you are thinking is a cat is a crossover chamber.  My boys and I ran dual exhaust on both rigs right after the crossover chamber.  We purchased individual hi end cat for emissions purposes and placed them right before the cherry bombs on both sides.  It does not mess with the back pressure and sounds awesome....... 



#3 tractor pole

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Posted 08 November 2013 - 11:56 AM

No the flanges are completely different and I believe that the ea 81 is narrower between the exhaust ports than the ej.

#4 Gloyale

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Posted 08 November 2013 - 11:56 AM

hi i just bought a 1986 subaru brat with a 1.8 carbureted engine. i was looking for a non catalytic converter y pipe but cant find anything, i was wondering if a uel single port headers from a 2.2 or a 2.5 would work with this engine

 

 

~Zack 

 

No the EJ headers will not work.

 

Gotta make it or use one with a CAT.



#5 BoxerRebellion

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Posted 08 November 2013 - 12:46 PM

And the fortune cookie says...

"custom exhaust is in your future."



#6 barracuda423

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Posted 08 November 2013 - 06:23 PM

darn i was hoping i didnt have to go custom so i could just bolt it on but if i have to then i will, the thing is i was looking for like a 3" exhaust 



#7 Captin Hook

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Posted 10 November 2013 - 07:53 PM

3" is way to big for a ea81 motor. 2 1/2 is as big as you would want to go.

#8 ford'ssubaru's

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Posted 10 November 2013 - 09:18 PM

3" is way to big for a ea81 motor. 2 1/2 is as big as you would want to go.

This is very true.  Subaru engines are designed to have backpressure.



#9 MilesFox

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Posted 10 November 2013 - 09:33 PM

People always confuse the term 'backpressure' with 'scavenging'. The idea of scavenging is keeping the exhaust velocity up to pull exhaust out of the combustion chamber. The idea of 'backpressure' is the exhaust pulses reflecting in the system to give a charging effect, especially with expansion chambers in 2-stroke engines.


Edited by MilesFox, 10 November 2013 - 09:34 PM.


#10 el_freddo

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Posted 13 November 2013 - 07:22 AM

3" is way to big for a ea81 motor. 2 1/2 is as big as you would want to go.

 

And with that said, I've got an EJ22 with a 2 1/4 inch exhaust and I reckon that's plenty big.


Personally I'd be looking at a 2 inch exhaust, but if you're building the extractors you might as well port match from the head then go the two inch after the cat and do what you want from there.

To big too early leads to a bad sound and poor performance...

Cheers

Bennie



#11 TomRhere

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Posted 15 November 2013 - 07:23 PM

I built a dual exhaust system under one of my BRAT's using 2" tube. It did not like it...

 

1-7/8" ID from the heads back to about a 26" length, then go up to a 2"ID system is about the best you can do.



#12 ford'ssubaru's

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Posted 13 December 2013 - 07:45 PM

I built a dual exhaust system under one of my BRAT's using 2" tube. It did not like it...

 

1-7/8" ID from the heads back to about a 26" length, then go up to a 2"ID system is about the best you can do.

I learned this lesson too.  Made it look really good too.  Gotta have that crossover.  Had to refab my fab....LOL.



#13 TomRhere

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Posted 13 December 2013 - 08:52 PM

Yeah, spent a long day building that system. Fit a piece, mark next piece, cut, refit, mark more. Run to the shop cut and tack weld. Refit and see what needed to be done next. Yadda, yadda, yadda.

 

It sounded so good!!!! But it sure destroyed what little HP/Torque that engine had. Really didn't have much for oomph down low, but it ran good on the highway.

 

1-7/8" ID lead pipes for sure, and like I said, 26 or so inches long. Then,,, you can jump to 2" ID to finish things.

 

Tying the 2 banks together is a good thing also, just have to decide that one yourself as to where it should be done. Old school exhaust build trick was to use some cheap White paint to cover the pipes. Give it a run around town, see where paint was the darkest as far as being burnt. That is where you need to put a crossover pipe in.



#14 ford'ssubaru's

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Posted 20 December 2013 - 06:13 PM

People always confuse the term 'backpressure' with 'scavenging'. The idea of scavenging is keeping the exhaust velocity up to pull exhaust out of the combustion chamber. The idea of 'backpressure' is the exhaust pulses reflecting in the system to give a charging effect, especially with expansion chambers in 2-stroke engines.

I r a heavy equipment meknic....I stand corrected...:-).  In the future I will use the proper term.  It is stll correct that you can't go too large or you lose performance correct?  When I first made mine it ran like crap with not very much oompf..( I use the word OOMPF loosely) with the EA82.  I went back down and it sounded better and ran better.  I spent a lot of time on that exhaust....LOL.



#15 skishop69

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Posted 21 December 2013 - 05:55 PM

Correct. As previously stated, you loose the scavenging effect and suffer a loss of low end torque and HP.






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