Welcome to Ultimate Subaru Message Board, my lurker friend!
![]() |
Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created. We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning ** Not an actual guarantee, but seriously, you probably won't regret it! Serving the Subaru Community since May 18th, 1998! |

single port vs dual port ea82
#1
Posted 20 March 2007 - 08:54 PM
What i'm wondering is, how can I tell which I have in my '88 gl? does anyone know what model year a switchover was made? Any differences in hp? Any preference? I don't know much about the difference and am curious to learn a bit about it.
Thanks!
#2
Posted 20 March 2007 - 09:06 PM
#3
Posted 20 March 2007 - 09:14 PM
Is there two inlet runners going from your inlet manifold to each head or is their only 1? Also the top of the inlet manifold should say MPFI if it's the dual port design.
That had me all confused and doing a search. I wasn't thinking intake ports, I was thinking exhaust ports like on the ej22 phase 1 and phase 2
#4
Posted 20 March 2007 - 09:28 PM
If your car has a carb or SPFI on it, it will have single port intakes
If you car has MPFI or MPFI TURBO, it will have dual port intakes. If it has MPFI, it will be obvious, there will be four injectors, one in each of the intake runners.
#5
Posted 20 March 2007 - 09:33 PM
#6
Posted 20 March 2007 - 11:04 PM
Changes the compression alot. Run a turbo block and pistons without a turbo and you might make 60 hp. Suckage
Run Non-turbo block and pistons and you have a recipe for trouble, too high a compression ratio to be Turbo(debated). But what is not debateable is that the Non Turbo pistons are way wimpier than the turbos. Check out the "splitting headache" thread in the retrofitting forum. Gravityman has been so kind as to butcher his head and pistons to give us a look inside.
There we're a few non-turbo engines with the dual port heads and MPFI. they were in the non turbo XT's. If you really want a dual port without a turbo, that's were to start.
Listings from parts stores are frequently wrong as far as what goes in what. But I can assure you, you're 88 GL, unless it is turbo, is a single port. Hopefully SPFI. I think the best setup available from a reliability standpoint as far as EA82s go.
#7
Posted 21 March 2007 - 12:11 AM
#8
Posted 21 March 2007 - 01:57 AM
I guess they do, a lot. I was looking at it with using a turbo perspective. Not vice-versa.Changes the compression alot. Run a turbo block and pistons without a turbo and you might make 60 hp. Suckage
#9
Posted 21 March 2007 - 02:32 AM
#10
Posted 21 March 2007 - 09:36 AM
The non-turbo GL-10s also had MPFI, however I heard that it was only in 85 they came this way, and I have yet to find a non-turbo EA82 GL-10 (I used to have an 83 GL-10 that wasn't turbo...)
I saw an 85 in the junkyard. GL-10, sunroof, digidash, Trip computer, and the works. I'm thinkin "sweet, Turbo parts!" open the hood and what is there but a hitachi carb. there should be a smiley for WAA, WAAA, WAAAAAA.....

As far as I know the MPFI non turbo(na) motor was only in XT's in the states. It may have been an option on GL-10's but I can't find any proof of this. It does mention the NA MPFI in the 86 FSM. But in that year XT's are covered toghether with GL/DLs. in fact if you look at the back of an 86 XT, it will say GL or GL-10 on one side, and XT on the other. Later XTs are just XT or XT6
Kinda like the early Nissan Altima. In order to not have to pay taxes on a seperate or new model, they just called it a new version of an old model, then totally dropped the old name after a few years.
#11
Posted 21 March 2007 - 03:12 PM
#12
Posted 21 March 2007 - 04:27 PM
yeah, i saw on of those onceThe non-turbo GL-10s also had MPFI, however I heard that it was only in 85 they came this way, and I have yet to find a non-turbo EA82 GL-10 (I used to have an 83 GL-10 that wasn't turbo...)
#13
Posted 21 March 2007 - 04:51 PM
#14
Posted 21 March 2007 - 05:35 PM

#15
Posted 21 March 2007 - 07:36 PM

#16
Posted 22 March 2007 - 12:02 PM
So if someone wanted some more power from there NA EA82 they could do a head swap to dual port heads and a MPFI setup? Reliable because your not running a turbo.
I said that, too.. but its not much more breathing power, and you are still stuck with the same flow design within the heads themselves...
to REALLY get any more power out of an EA-82, its gonna take some serious grinding and changing the cylinder head, and I am not entirely certain its even possible. I didn't remove my valves when I had my heads off for the gasket job, so I don't even KNOW if there is meat to be ground away; but the engine just was not made to breathe, it was made to get good fuel mileage, reliable low end torque, and be an econobox.... improvements can be made, but don't expect much. A nissan SR-20, this is not.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users