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Old 03-06-2011, 07:54 AM   #1
onurba32
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Default ej20k sti heads differences?

I want to buy ej20k sti heads but ı cant understand
ıs ıt wrx or sti ?
How can we understand ıt ıs certaınly ej20k sti heads?

some of them say
sti heads have shıms under buckets
cams codes l4in l4ex r4in r4ex
and on the valves written IH EH

these ınfos are true?
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Old 03-06-2011, 11:17 AM   #2
AWD P & A
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Yes, yes, and yes.

The castings also have cross hatching inside.
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Old 03-06-2011, 11:47 AM   #3
onurba32
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alright
http://forums.nasioc.com/forums/show...ht=ej20k+heads is it an sti head ? ı am abit confuse
because on the valves written eh ıh
cams codes are correct but shım over bucket what are these heads??
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Old 03-06-2011, 05:04 PM   #4
NICO TURBINE
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i have all these heads ej20g, ej20k, ej20k sti.

ej20g hydraulic, ej20k shim on bucket, ej20k sti shim under bucket (lighter also), stronger springs, sodium filled valves, steel stem stainless steel bottom.

all heads have same size ports, and same cam lobe profiles IN & EX.

ej20g die after 6000rpm, ej20k very nice heads made some good power right to 7500rpm, and i just put on ej20k sti heads so it feels the same as the ej20k set up, but the dyno will tell the right numbers.
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Old 03-06-2011, 06:14 PM   #5
AWD P & A
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Quote:
Originally Posted by onurba32 View Post
alright
http://forums.nasioc.com/forums/show...ht=ej20k+heads is it an sti head ? ı am abit confuse
because on the valves written eh ıh
cams codes are correct but shım over bucket what are these heads??
I'm pretty sure those are 20k STi heads. Like I said the cross hatching inside the head would confirm it 100%
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Old 03-06-2011, 07:09 PM   #6
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They do look like sti heads.
Just to point something out you cant tell if they are g or k by whats written on the cams. LH RH etc is common.
Neither can you tell by whats written on the valves, IH EH intake, exhaust etc its also common. Its easier to tell by the cam covers and the cams themselves.

There is a difference in the cams, place a set of G cams next to K cams and you can visually see the profile difference.
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Old 03-07-2011, 11:23 AM   #7
onurba32
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Quote:
Originally Posted by AWD P & A View Post
I'm pretty sure those are 20k STi heads. Like I said the cross hatching inside the head would confirm it 100%
so can we say that heads were rebuılt with shım over bucket and dıfferent retaıners?
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Old 03-07-2011, 11:34 AM   #8
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All 1997-1998 DOHC cams have the '4' marking, you need to look at the grooves. What are the markings on the valve face?
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Old 03-07-2011, 11:54 AM   #9
onurba32
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on the valve EH IH grooves lıke an ej20k sti but shim over bucket
http://forums.nasioc.com/forums/show...ht=ej20k+heads
pictures in this link can you look for me

Last edited by onurba32; 03-07-2011 at 12:00 PM.
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Old 03-07-2011, 12:50 PM   #10
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Quote:
Originally Posted by onurba32 View Post
on the valve EH IH grooves lıke an ej20k sti but shim over bucket
http://forums.nasioc.com/forums/show...ht=ej20k+heads
pictures in this link can you look for me

In that link looks like STi castings with STi valves but WRX/Forester springs, retainers,and shim over bucket.

The V3-4 WRX/STi/FXT all had the same sized valves so they can be interchangable. The STi has taller springs. If I hadn't already assembled my heads I would post up a comparison of the valvetrain between the two.
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Old 03-07-2011, 02:01 PM   #11
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Those cams in those pics indeed are EJ20K STI.

The IH and EH valves are also EJ20K STI as far as I know.

Just *very* curious that the shim setup is non-STI.
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Old 03-07-2011, 08:56 PM   #12
tenchu
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Those are my heads, i'm just as curious as he. If someone can tell me what exactly to take pictures of, I will take more detailed pictures.
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Old 03-07-2011, 09:12 PM   #13
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Lol, same as my 97 ej20k heads... subscribed

Last edited by 2slofouru; 03-07-2011 at 09:59 PM.
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Old 03-08-2011, 01:40 AM   #14
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I just learned that all EJ20K engines share the same valves. So it is probably an EJ20K non-STI head just need to figure out if that is the original cam.
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Old 03-08-2011, 02:27 PM   #15
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in the link posted above, the cams are all the same ! ej20g ej20k ej20k sti all the same no matter what is stamped in the stupid things. the valve set up is ej20k wrx NON STI ! if it was mixed up then get a magnet and see if it sticks to the valve, if it does not then you have a sti valve.


Quote:
Originally Posted by NICO TURBINE View Post
i have all these heads ej20g, ej20k, ej20k sti.

ej20g hydraulic, ej20k shim on bucket, ej20k sti shim under bucket (lighter also), stronger springs, sodium filled valves, steel stem stainless steel bottom.

all heads have same size ports, and same cam lobe profiles IN & EX.

ej20g die after 6000rpm, ej20k very nice heads made some good power right to 7500rpm, and i just put on ej20k sti heads so it feels the same as the ej20k set up, but the dyno will tell the right numbers.
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Old 03-09-2011, 12:46 AM   #16
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That is not true, the early EJ20G, late EJ20G and EJ20K have different cams with different duration and different timing.
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Old 03-14-2011, 08:46 PM   #17
NICO TURBINE
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Quote:
Originally Posted by Marnix View Post
That is not true, the early EJ20G, late EJ20G and EJ20K have different cams with different duration and different timing.
Where is your proof ? I have 93 ej20g type ra heads (hole car), I have ej20g wrx heads, I have ej20k wrx heads, also just got and installed ej20k sit heads on my ej22t

http://www.bbs.legacycentral.org/vie...p?f=25&t=41766
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Old 03-15-2011, 03:04 AM   #18
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I have all the cams and the factory documentation.

Factory specs for 1997-1998 '4' cams (so not for HLA):

USDM EJ25D
Intake opens 6 BDTC
Intake closes 50 ABDC
Exhaust opens 54/30 BBDC
Exhaust closes 10/10 ATDC
Overlap 16

JDM EJ20G
Intake opens 8 BDTC
Intake closes 52 ABDC
Exhaust opens 52 BBDC
Exhaust closes 8 ATDC
Overlap 16

JDM EJ20K STI
Intake opens 10 BDTC
Intake closes 56 ABDC
Exhaust opens 56 BBDC
Exhaust closes 12 ATDC
Overlap 22

JDM EJ20D
Intake opens 6/4 BDTC
Intake closes 54/56 ABDC
Exhaust opens 66/36 BBDC
Exhaust closes 24/16 ATDC
Overlap 30/20

I import engines from Japan regularly - purchased 4 fully closed deck blocks last year of which 2 type RA underbucket shim - and also JDM EJ20G SF5 engines (which you may call EJ20K which they are not). I worked on EUDM EJ20G engines as early as 1998 and I've rebuilt many, many of them. Not meaning to brag, just showing I've got extensive experience and some knowledge of the engines, including original JDM factory service manuals to back it up. Just a pity I can't read Japanse LOL.
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Old 03-15-2011, 05:42 PM   #19
NICO TURBINE
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nice numbers have you measured the cams them selfs ?
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Old 03-16-2011, 03:05 AM   #20
Marnix
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Yes, even the lobe heights are different. And the cams have different part numbers and different markings on the castings aswell (machined grooves).
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Old 03-16-2011, 08:52 AM   #21
NICO TURBINE
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so why dont you put up pics for me to see all these wonderful things you speak about ?
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Old 03-16-2011, 11:23 PM   #22
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thought i would post up this pic of my heads... this is form a jdm 97 wrx. Notice the "cross hatching" and shim on bucket.





I didn't take any pics of the stamping on the cams.

I also wanted to eventually trade up to sti heads but if all that is different is valve material and springs I might as well just save my money and go bigger.
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Old 03-17-2011, 12:15 AM   #23
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here are a few pics of some Shim Under Bucket EJ20K STi heads that i have on my car.
sorry i didnt get more pictures before i installed them...





and the buckets compaired to EJ20G hydro buckets. they are not the same size and not interchangable... the spring tops are even different.





-=Suberdave=-
www.suberdave.com
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Old 03-17-2011, 01:52 AM   #24
Marnix
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The 1992-1996 EJ20G engines have 31mm HLA buckets or 31mm shim under buckets (type RA), both 1997-1998 EJ20G and EJ20K non-STI have 33mm shim over buckets and the 1997-1998 EJ20K STI has 33mm shim under buckets.

The heads posted by 2_Liter_EJTurbo are 1997-1998 EJ20G heads based on the single offset groove on the cams between the lobes for each cylinder.
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Old 03-17-2011, 10:59 AM   #25
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stock ej20k sti valves springs retainers with good condition what psi can we use max?
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