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05-05-2009, 09:38 PM | #1 |
Scooby Specialist
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SCIC
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Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
EJ20K how good is it?
I'm thinking about getting and EJ20K block pistons and rods out of an v4 JDM STi. My question is how reliable is this motor, I hear they have a tendency to detonate on 91 pump gas. I'm in Cali so the best we get at the pump is 91.
I would have to get a crank for it, I think one from an EJ18 will fit (can anyone confirm this?) and heads turbo drivetrain and ECU from my 04 WRX. My question is if I build a EJ20K/EJ207 hybrid will I really see any performance gains? The block is stronger right, so I should be able to push more boost? Or would the heads and valves from the EJ207 limit what I could get from the block. Would I need to worry about running it on 91 octane if its tuned for it and it's a hybrid motor? I'd probably get bigger injectors (565cc?) and I would plan on eventually upgrading the turbo, right now I've still got the stock td04. Any help much appreciated.
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05-06-2009, 07:43 AM | #2 |
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The block is nothing special only the pistons are. They are forged items, the rest is as stock as anything else. Only the V4 heads are someting special. They have hollow intake valves, sodium-filled exhaust valves, shim-under-buckets and cams with more duration.
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05-06-2009, 01:49 PM | #3 |
Scooby Scammer- Do Not Buy From User
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everything ive heard is that the STI cams are the same as all others, well, out of the EJ20k anyways
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05-06-2009, 02:54 PM | #4 |
Scooby Guru
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Only the Type-RA ej20k has these features. Most are standard shim over bucket lifters.
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05-06-2009, 02:57 PM | #5 |
Scooby Scammer- Do Not Buy From User
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STI is shim under bucket, from what ive read the pistons are forged in the STI models, but besides those two things they're the same. but the shim under bucket is nice for the higher rev...
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05-06-2009, 02:59 PM | #6 |
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biggest thing ive heard about with reliability is the rod bearings going out due to improper oil changes and old age... but if they're replaced doesnt seem to have any major trouble...
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05-06-2009, 03:19 PM | #7 |
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ej20k and ej207 heads are some of the best heads you can get as far as flow capacity and rev capabilities. the ej20k blocks arent anything incredible, but they are nice enough. just make sure you either get it tuned right off with engine management, or at the very least run some octane booster (torco). it might also be a good idea to split the block apart and redo all the bearings
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05-06-2009, 04:08 PM | #8 | |
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Quote:
It took me weeks of searching to find replacement shims for my shim under bucket setup, every parts website I checked listed the STI EJ20K as shim over bucket. Only when I finally found a listing for the Type RA did it produce shim under bucket numbers. |
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05-06-2009, 04:55 PM | #9 |
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i know the normal EJ20K WRX motor rev's to 6.9k, the STI rev's to 7.9k. ive been told this is attributed to the shim under bucket. i havnt pulled off the valve covers on my motor, but my tach redlines at 7.9k and its an STI motor.
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05-06-2009, 06:45 PM | #10 | |
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Quote:
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05-06-2009, 07:25 PM | #11 |
Scooby Scammer- Do Not Buy From User
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prob the same for the V4 then too, all the specs i looked at seemed to say that anyways...
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05-06-2009, 09:57 PM | #12 | |
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Quote:
i recently learned all this and the motor as yet to be in my car... you wont be able to run it off your 04 ecu either, there is some difference in the cam position sensor and a few other things from the older ecu's vs. newer ecu's. im going to run my 20k off a 98 2.5 rs ecu with a greddy emanage. i dont care if it doesnt untilize every ounce of potential from the motor, cuz either way ill be better off than i am with the 130 hp 2.2l n/a thats there now... |
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05-06-2009, 10:54 PM | #13 |
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Can you confirm that your non-RA STI heads are shim under bucket?
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05-06-2009, 11:27 PM | #14 |
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05-07-2009, 12:14 AM | #15 |
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Maybe its only the UK/Aussie 20K sti motors that are shim over bucket?
I dunno, subaru doesnt seem to have any consistency about what they put in their motors. |
05-07-2009, 03:49 AM | #16 |
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05-07-2009, 08:43 AM | #17 | |
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Quote:
http://forums.nasioc.com/forums/show....php?t=1752492 |
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05-07-2009, 09:14 AM | #18 |
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Non-STI WRX with EJ20K are shim-over-bucket (have blank intake manifold)
STI WRX with EJ20K are shim-under-bucket (have red intake manifold) Valves and valve springs are different, too. MY98 EJ20K STI MT WRX STI sedan and wagon ECU 22611AE360 7.9K RPM Cams 13***AA390 Shim-under-bucket Injectors 16611AA231 MY97 EJ20K STI MT WRX STI sedan and wagon ECU 22611AD170 7.9K RPM Cams 13***AA240 Shim-under-bucket Injectors 16611AA231 MY97-98 EJ20K non-STI MT WRX sedan ECU 22611AC722 7.5K RPM Cams 13***AA240 Shim-over-bucket Injectors 16611AA231 MY98 EJ20G MT WRX wagon ECU 22611AE380 7.0K RPM Cams 13***AA230 Shim-over-bucket Injectors 16611AA101 (grey tops) MY97 EJ20G MT WRX wagon ECU 22611AC731 7.0K RPM Cams 13***AA230 Shim-over-bucket Injectors 16611AA101 (grey tops) Oh and Subaru knows perfectly well what they put into their engines or into their cars (except closed deck maybe ) most confusion comes from owners/people misinterpreting engine types and identification. |
05-07-2009, 10:53 AM | #19 |
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What I don't understand is if the shim under bucket is so common, why did I end up having to go through a russian parts catalog in order to find the part number?
No one lists them. |
05-07-2009, 12:33 PM | #20 |
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marnix saves again! from now on im just coming to you with all my questions
and i assume the 7.9K RPM is the redline not the fuel cut on the ecu (?) they really not that common. only a few model years and only on the sti's. and we're talking about 11 or 12 year old parts. its hard enough just to find the right part numbers for what you need, unless there are people like Jaxx and Marnix around to provide/confirm part numbers. and THEN you have to find a place that can either order from SOJ or has their own equivalent parts |
05-07-2009, 12:40 PM | #21 |
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fuel cut on my 6S ecu (V3 STi Type R)was 8250. I hit it a couple of times while autoxing.
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05-07-2009, 01:03 PM | #22 | |
Scooby Specialist
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Quote:
also the v4 22611AE360 sti ecu is "75" the v3 22611AD170 sti ecu is "6S" (apparently) |
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05-07-2009, 06:31 PM | #23 | |
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Quote:
bottom of page 13202 VALVE EXHAUST GC8 D/E***12288;EJ20K 46,900 yen(JPY) (478.38 USD) 13201 VALVE INTAKE GC8 D/E***12288;EJ20K 43,400 yen(JPY) (442.68 USD) |
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05-07-2009, 07:21 PM | #24 |
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Those are valves. Not shims.
Furthermore, if you look at the diagram, it clearly illustrates a shim over bucket setup. |
05-07-2009, 07:55 PM | #25 |
Scooby Scammer- Do Not Buy From User
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for the 7900 rpm thats as it is on the instrument cluster, i dont have my motor fully wired in yet so i cant confirm fuel cut....
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