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Old 01-10-2004, 02:00 AM   #1
Kostamojen
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Exclamation The Legendary EJ20 heads on an EJ18 block experiment

So yes, today I tried them out. Took apart a ej18 left over at EddyRS's house and tested how the EJ20 heads will work with it. Good learning experience for me, and heres what I learned:

A) The EJ18 heads suck. They have far smaller intake holes, and inky dinky ports and valves...

B) Everything bolts up perfect. The headgaskets from the EJ20 head work perfect on the EJ18 block, and allow the coolant channels to get through properly. And on a side note, the ej18 head channels are far smaller than the ej20 (no surprize). Even the coolant aluminum channel on top uses the same bolt locations as the ej18 one...

C) Despite the fact that everything bolts up fine, there is a serious problem. The valves. The EJ20 valves are so much larger, and spaced so differently that they will most definatly hit the EJ18 pistons at the valve relief cuts in the piston This means that aftermarket pistons will be required for the EJ20 heads to work with the EJ18

Here are some pics:

http://community.webshots.com/album/110209915vXVzdU

If anyone has any questions or comments, feel free to post.
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Old 01-10-2004, 01:24 PM   #2
xxtwowheelfiendxx
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Isnt the EJ18 a SOHC while the EJ20 is a DOCH? Or at least thats how it looks in the pics, and if it is how do you set up the belts?
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Old 01-10-2004, 01:34 PM   #3
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Quote:
Originally posted by xxtwowheelfiendxx
Isnt the EJ18 a SOHC while the EJ20 is a DOCH? Or at least thats how it looks in the pics, and if it is how do you set up the belts?
You are correct, but I don't know the answer to the belt quesiton.

Good info, I think you have me convinced on what I want to do.

Brent
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Old 01-10-2004, 05:32 PM   #4
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Quote:
Originally posted by xxtwowheelfiendxx
Isnt the EJ18 a SOHC while the EJ20 is a DOCH? Or at least thats how it looks in the pics, and if it is how do you set up the belts?
Yes, the EJ20 is DOHC. For the belts, you just use EJ20 timing belts, no biggie.
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Old 01-10-2004, 05:33 PM   #5
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Quote:
Originally posted by scoobyimprza
Good info, I think you have me convinced on what I want to do.

Brent
What are you going to do?
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Old 01-11-2004, 09:16 AM   #6
Imprezd
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pretty cool experiment I would have loved to hear how that work out to be a bolton operation. Eh that sucks..

Hey if you want i have a ej20 short block for $500 that would make you an N/A ej20 but probably be pretty interesting to see how it runs in N/a form.

Good Luck anyway.

Imprezd~
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Old 01-11-2004, 10:15 PM   #7
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Naw, its ok, im getting a whole 260ps closed deck EJ20G including turbo among other things for not much more than that So im good
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Old 01-12-2004, 12:13 PM   #8
redwagon
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Your EJ18 heads have one exhaust port or two? I can't see them in the pix.

Just curious, I have a P2 EJ18 with twin exhaust ports and wonder if there would be such a difference with the EJ20 heads.
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Old 01-12-2004, 12:49 PM   #9
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They're twin ports.
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Old 01-12-2004, 02:48 PM   #10
Jaxx
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... well that and the engine mangment not sure how the ecu would deal with the smaller DOHC timing belt wheel on the cam sensor

want to sell that turbo ...
please?
-j
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Old 01-12-2004, 05:30 PM   #11
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Quote:
Originally posted by Jaxx
want to sell that turbo ...
please?
-j
Which turbo, from the EJ20G? Thats a possiblity.
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Old 01-13-2004, 11:07 AM   #12
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yeah yeah the td05...will swap you for a nice vf-10
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Old 01-13-2004, 02:25 PM   #13
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In you case the lower compression pistons...if made should fix your problem....go to www.jepistons.com and check out what some custom pistons will run you. I was looking into it. but you will need measurements from your engine.
Take it easy, Micah
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Old 01-13-2004, 05:27 PM   #14
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Quote:
Originally posted by Jaxx
yeah yeah the td05...will swap you for a nice vf-10
FYI, I was told the turbo needs to be refreshed, ill know more about it this saturday.
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Old 01-13-2004, 05:28 PM   #15
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Quote:
Originally posted by Homemade WRX
In you case the lower compression pistons...if made should fix your problem....go to www.jepistons.com and check out what some custom pistons will run you. I was looking into it. but you will need measurements from your engine.
Take it easy, Micah
Oh dont worry, I wont be going through with this. But thats good info for anyone who would be
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Old 01-14-2004, 12:10 PM   #16
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Kosta- Long time no see. If you need a hand turning wrenches on your swap, let me know. I'll be back to CA around 21Jan.
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