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Old 05-01-2003, 02:21 AM   #1
Kostamojen
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Lightbulb Hmmm.... DOHC EJ20 heads on a 1.8 Block?

Ive thought about this before, but after seeing a pic of a 1.8 blocks internals the idea poped back into my head... Would it work? Would it be interesting? I'm just curious... I like the idea of not having to do a total engine swap, along with staying with an N/A engine and not worrying about torque blowing up my older design cable clutch tranny...

Thoughts? Maybe combine the heads with another intake manifold, or perhaps get it programed to rev nicely (~7500rpms+?)
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Old 05-01-2003, 09:53 AM   #2
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I'd be interested in hearing how this works out. Would compression be lowered a tad with the EJ20 heads?

I would think the EJ20 valves, springs & cams would work well with an aftermarket turbo on the EJ18.
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Old 05-01-2003, 10:16 AM   #3
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hey, where did you see the pics of the internals... i would also like to see these pics too.

also, i heard somewhere(cant remember right now) that the con-rods in the ej18 are the same as the ones in sti motors..... is this info right?

i would also like to see this swap....
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Old 05-01-2003, 10:53 AM   #4
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i had considered this too

perhaps ill do this next winter
i have all the pieces

um why would't it blow up your tranny ...

1.8 at 9.x to 1 still going to make some torque .. more than the 8.0 to 1 ej20

wonder how long till i blow my tranny up with the ej20
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Old 05-01-2003, 11:55 AM   #5
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The EJ18 compression is 9.5 to one.
I've heard a lot about the EJ18 engine in being good for turboing because
1) people say the internals are the same
2) that the MAF is aloud to take in enormous amounts of air without it breaking
3) also because the blocks are closed or at least semi-closed
I don't know if there is any proof of this but this is what I was told.
I'm going with the EJ20 swap. I'm not keeping the EJ18 in the car but am going to have a lot of fun ripping it apart, rebuilding it and slapping it onto a sand rail.
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Old 05-01-2003, 05:53 PM   #6
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There are a number of turbo'd EJ18s around here. For whatever reason(s), they seem to handle the boost quite well.
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Old 05-01-2003, 06:43 PM   #7
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i think most of the people w/ turbo 1.8's around here are running only around 5 pounds of boost..... it's not like theyre cranking it up alot.

arent the 1.8's open deck though?
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Old 05-02-2003, 01:44 AM   #8
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The 1.8's are open deck...

And I meant N/A NOT Turboed!
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Old 05-02-2003, 03:24 AM   #9
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Pics (from this post http://forums.nasioc.com/forums/show...hreadid=302416 )

EJ18 Internal shot (Note the THICK arse cylinder walls)


And here is a EJ25 for reference, and why I think the EJ20 heads will bolt up just fine
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Old 05-02-2003, 08:12 AM   #10
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haha really professional, sitting on an old tire.
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Old 05-03-2003, 03:48 AM   #11
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Its an EJ18, I dont think they cared
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Old 05-03-2003, 07:50 PM   #12
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about turbo 1.8's though..... how much boost could they handle w/ proper management and pistons? those cylinder walls look pretty srong. like i said before, i've heard the 1.8's have the same rods as earlier sti engines.... what about the crank? how strong is that if anyone knows...

also, do they even make pistons for the 1.8?
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Old 05-08-2003, 06:55 PM   #13
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So will they fit or not? I'm now wavering back and forth between EJ20 or turboing my EJ18. I'm really swaying on whether or not the DOHC will fit. I'll go ahead and bore it out and do a 2.2 stroker kit for it but wondering if the DOHc will fit. Does anyone know?
thanks, Micah
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Old 05-09-2003, 01:41 AM   #14
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Quote:
Originally posted by Homemade WRX
So will they fit or not? I'm now wavering back and forth between EJ20 or turboing my EJ18. I'm really swaying on whether or not the DOHC will fit. I'll go ahead and bore it out and do a 2.2 stroker kit for it but wondering if the DOHc will fit. Does anyone know?
thanks, Micah
I havent found any 2.0 heads floading around yet, so no idea.
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Old 05-09-2003, 03:25 PM   #15
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The heads will fit. In otherwords they will bolt on. Earlier someone referred to a subaru turboed 1.8. That is a completely different engine that the EJ18. None of the '93 and later stuff will work with it.
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Old 05-11-2003, 11:29 PM   #16
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i remeber where i found out the con rods are the same in the 1.8's as in the RA motors.....

"It is interesting to note that the RA motors still share connecting rods with the N/A 1800cc motor. The quality is in the N/A motors, it is just put to different use. "

this is directly from spdusa's site.

i think an ej18 w/ low compression pistons, ej20 heads and intake would be a good turbo motor... if the block could handle it, which im sure it could. would 10+ psi be reliable w/ proper management...?

oh ya, what about the crank in the ej18?
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Old 05-16-2003, 12:22 AM   #17
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very interesting stuff, guys... i'm with Kost, i would like to stay N/A in my 1.8, unless i would do an ej20 swap. the swap looks like hell in a handbasket, so this is intriguing. Hell, getting the 1.8L to 160 N/A hp would make a great little car to play with.

~~Quentin
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Old 05-18-2003, 09:37 AM   #18
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first off I am a noob still trying to learn things....don't mean to steal a thread but I have a couple questions
1.when you say an open deck what do you mean
2.in the future I plan on getting either a 2000 or 2001 RS I want to know if a EJ22 would be a good strong motor to put in and turbocharge or if the EJ20 is better.I plan on running at least 15 psi if possible.Any help would be great
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Old 05-19-2003, 10:15 PM   #19
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1. Open deck = Like those two pictures I posted, where the piston walls have open space around them.

2. For 15psi, a WRX engine would work fine. I dont think you could turbo a 2.2 to 15psi without ALOT of work, and I mean ALOT.
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Old 05-21-2003, 07:03 PM   #20
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correct me if I'm wrong but the turbo legacy engine EJ22T if that is what you guys are talking about has a compression of 8.0 and the WRX has 8.2 so theoretically couldn't the EJ22T hold more boost?
Micah
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Old 05-21-2003, 10:11 PM   #21
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hey thats my motor sitting on a tire!
ok so:
Quote:
1) people say the internals are the same
yes, the con rods and the crank are the same in the ej18, ej20, and ej22.

Quote:
3) also because the blocks are closed or at least semi-closed
you can see from the pic that the block is between open and semi-closed, its not completely open like some honda's, but its only supported by two braces instead of four, like a true semi-closed.

Quote:
about turbo 1.8's though..... how much boost could they handle w/ proper management and pistons?
alot. the block is the same as a ej20, but the bore is only 87mm instead of 92, yeilding higher block strength. and again the rods and crank are the same. pistions clutches and trannies are the weakest link.

Quote:
So will they fit or not?
they will probably bolt on, but remember to check that the coolant lanes match up. and think of which head gastket to use. i would use the smaller one because i wouldnt want to cut away the ring on the head gasket around the cylinder wall.

Quote:
a compression of 8.0 and the WRX has 8.2 so theoretically couldn't the EJ22T hold more boost
the compression is lower, but the side walls of the block are also thinner. the ej22 has a bore of 5mm more than the ej20, so it is weaker in that way.
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Old 05-21-2003, 11:00 PM   #22
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cool, thanks for all the answers....

i still dont know which route i want to go w/ my car, but it'll all come to me in time......
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Old 10-24-2003, 04:00 AM   #23
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Bump...

If I were actually to try this, what would I need to do with the EJ18 pistons? Like a specific piston to replace the stockers with? Stuff like that...
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