Welcome to the North American Subaru Impreza Owners Club Tuesday July 23, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 06-01-2017, 12:43 PM   #301
subaru_gc8
Scooby Specialist
 
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

Default

Tour going to loose compression if you use the ej257 heads not to mention the combustion,chamber is going to very wired shaped
* Registered users of the site do not see these ads.
subaru_gc8 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 06-03-2017, 09:45 AM   #302
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Milton Keynes, UK
Vehicle:
96 3MI Racing
search FIRST, then PM!!!

Default

Quote:
Originally Posted by rstiman View Post
Hi I'm pretty new to a build like this any advice for this type of build, I wanna keep the 75 mm crank but need to use 257 head on a Ej22t block what pistons and rods should be used with what compression please help.
So you want to run an EJ22 with EJ257 heads....well B and W 25 castings are going to be terrible for combustion. D25 (EJ255) will be the best set up given the compromises you want. If you're not running AVCS or even if you are, EJ205 or EJ207 would be better.

If you're not running big power, EJ257 block would be better with the EJ255/7 heads and then you can pick up about some displacement and have all the same perks.
Homemade WRX is offline   Reply With Quote
Old 09-22-2017, 10:08 AM   #303
Sinister02rs
Scooby Newbie
 
Member#: 474955
Join Date: Sep 2017
Default 2.3l ej25 destroker help

I know im a little (a lot) late on this thread but im new to the subie family and id like to start off with this. I recently bought a jdm 2002' impreza 2.5rs (ej25) and i managed to get my hands on another jdm ej25. I was reading up on the 2.3l destroker topic and had some questions on how i should go about the build. I already have a spare ej so im not worried about money or down time but how should i go about the parts ? Im a little worried I'll buy the wrong parts and i was hoping someone with experience or the know how could chime in and point me in the right direction. Anything helps weather it be a parts list or just a general tips and stuff, thanks in advance! ~kyle.
P.s sorry for reviving a dead thread just need some help
Sinister02rs is offline   Reply With Quote
Old 09-22-2017, 12:10 PM   #304
86Dreams
Scooby Specialist
 
Member#: 385256
Join Date: Mar 2014
Chapter/Region: NESIC
Vehicle:
'18 Giulia QV
'21 Giulia Q4

Default

Quote:
Originally Posted by Sinister02rs View Post
I know im a little (a lot) late on this thread but im new to the subie family and id like to start off with this. I recently bought a jdm 2002' impreza 2.5rs (ej25) and i managed to get my hands on another jdm ej25. I was reading up on the 2.3l destroker topic and had some questions on how i should go about the build. I already have a spare ej so im not worried about money or down time but how should i go about the parts ? Im a little worried I'll buy the wrong parts and i was hoping someone with experience or the know how could chime in and point me in the right direction. Anything helps weather it be a parts list or just a general tips and stuff, thanks in advance! ~kyle.
P.s sorry for reviving a dead thread just need some help
Please make a build thread if you get this started. Ive been very interested in it myself.

All Ive found on the topic so far was that you would need +4mm rods and that they are extremely hard to come by.

Good luck and keep posting!
86Dreams is offline   Reply With Quote
Old 09-22-2017, 02:59 PM   #305
Sinister02rs
Scooby Newbie
 
Member#: 474955
Join Date: Sep 2017
Default

Quote:
Originally Posted by 86Dreams View Post
Please make a build thread if you get this started. Ive been very interested in it myself.

All Ive found on the topic so far was that you would need +4mm rods and that they are extremely hard to come by.

Good luck and keep posting!
"4mm longer conecting rods" is where i got confused at myself being the previous comments were pretty vague on that subject, 4mm longer than the ej257 rods (75mm) would be 79mm (oem) , 4mm longer than the (oem) 79mm rods would be 83mm, also heard some people have had some luck with having custom pistons made with a 2mm lower wrist pin location to make up for some of the space with the shorter rods but i haven't heard much about that either. I ordered a ej205 crank and will use the oem 79mm rods to see just how short they fall because im not 100% on which rods were shorter, i actually have some 79mm rods laying around as spares so rather than going out and buying the 75mm rods i might not need im going to test the clearance with the 79mm rods first. I'll probably post more about the build updates on facebook so feel free to add me on there @kyle klingler but i will also start up a build thread to keep others informed on what i learn while doing this build - kyle
Sinister02rs is offline   Reply With Quote
Old 09-23-2017, 11:00 PM   #306
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Milton Keynes, UK
Vehicle:
96 3MI Racing
search FIRST, then PM!!!

Default

Sinister, you should go do some basic engine component research. You're mixing up stroke of the crankshaft and connecting rod length.

Also, +4mm rods aren't hard to come by.
Homemade WRX is offline   Reply With Quote
Old 09-28-2017, 10:53 AM   #307
86Dreams
Scooby Specialist
 
Member#: 385256
Join Date: Mar 2014
Chapter/Region: NESIC
Vehicle:
'18 Giulia QV
'21 Giulia Q4

Default

Quote:
Originally Posted by Homemade WRX View Post
Sinister, you should go do some basic engine component research. You're mixing up stroke of the crankshaft and connecting rod length.

Also, +4mm rods aren't hard to come by.
Where do we get them?
86Dreams is offline   Reply With Quote
Old 09-28-2017, 03:23 PM   #308
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Milton Keynes, UK
Vehicle:
96 3MI Racing
search FIRST, then PM!!!

Default

Shoot me a PM. I can point you in several directions.
Homemade WRX is offline   Reply With Quote
Old 10-05-2017, 07:32 AM   #309
whiterabbitrexy
Scooby Newbie
 
Member#: 379271
Join Date: Jan 2014
Default

Is there such a thing as buying all off the shelf crank,rods,pistions,bearings for a 2.31 stroker phase 2 block cr9.1 ? Like getting a specific ej22 na phase 2 block and dropping all the parts with no hassle

Or can anyone just send a link to a good reliable ej20 stroker build thread for 500awhp ....
Been reading this thread for 2 weeks and still confused as hell with all the different combos you could do but not really knowing what power it will handle ?
whiterabbitrexy is offline   Reply With Quote
Old 12-25-2017, 02:25 AM   #310
Aluxes
Scooby Newbie
 
Member#: 341471
Join Date: Dec 2012
Default

Just for clarification, by phase 1 ej25 do you all mean an ej25D up to 98?
Aluxes is offline   Reply With Quote
Old 12-25-2017, 11:01 AM   #311
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Milton Keynes, UK
Vehicle:
96 3MI Racing
search FIRST, then PM!!!

Default

Correct, that is what is referred to as a Phase 1 EJ25
Homemade WRX is offline   Reply With Quote
Old 01-15-2018, 10:59 PM   #312
FuJi K
Scooby Guru
 
Member#: 3687
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: St. Paul, MN
Vehicle:
MY99 GF4 JDM 6spd
NF Performance

Default

Quote:
Originally Posted by Aluxes View Post
Just for clarification, by phase 1 ej25 do you all mean an ej25D up to 98?
1999 Outback/Legacy GT is listed as EJ25D, but it does run a phase2 block, crank/rods, but phase 1 pistons/heads. odd ball......
FuJi K is offline   Reply With Quote
Old 03-27-2018, 07:04 AM   #313
Scargod
Scooby Specialist
 
Member#: 260314
Join Date: Oct 2010
Chapter/Region: NESIC
Location: S central CT, New England
Vehicle:
2007 STI
silver gray metallic

Default Is there a best/better EJ25 case for a built engine?

I haven't seen where specific EJ25 cases have been identified as stronger, beefier, better alloy aluminum or less likely to warp.
Can anyone shed light on this? Inversely, are there specific years/casting numbers that you want to avoid? Any cases with better, improved cooling passages or larger oil journals? WRX case or only "STi" case? Is there any distinction at all?
Have they improved over the years? Should I be buying a new case with a specific part number or year designation (year range) to work with for 500+ hp builds?
Scargod is offline   Reply With Quote
Old 03-27-2018, 01:12 PM   #314
car_freak85
Scooby Specialist
 
Member#: 13530
Join Date: Dec 2001
Chapter/Region: NWIC
Location: Cascadia
Vehicle:
EA63 , EA81T, EJ20G,
EJ205

Default

Quote:
Originally Posted by Scargod View Post
I haven't seen where specific EJ25 cases have been identified as stronger, beefier, better alloy aluminum or less likely to warp.
Can anyone shed light on this? Inversely, are there specific years/casting numbers that you want to avoid? Any cases with better, improved cooling passages or larger oil journals? WRX case or only "STi" case? Is there any distinction at all?
Have they improved over the years? Should I be buying a new case with a specific part number or year designation (year range) to work with for 500+ hp builds?
Do a username search for MrSaturn, he has covered this topic. The alloys don't change, AFAIK, but the castings have evolved over the years.
car_freak85 is offline   Reply With Quote
Old 03-27-2018, 01:13 PM   #315
jamal
Scooby Guru
 
Member#: 71875
Join Date: Oct 2004
Location: Montana
Default

Quote:
Originally Posted by whiterabbitrexy View Post
Is there such a thing as buying all off the shelf crank,rods,pistions,bearings for a 2.31 stroker phase 2 block cr9.1 ? Like getting a specific ej22 na phase 2 block and dropping all the parts with no hassle
Wiseco's 2.2 stroker piston is meant to be used with the phase 1 crank and rods, which I would try to avoid. They have those 48mm rod journals.

If you stick that piston in with a phase 2 crank and 130.5mm rods about the best you can do is 8.5:1 using a thin headgasket and ej25d heads. wrx heads drop it to about 8.1:1.

For the 2.0 -> 2.1 stroker JE does make a 9.5:1 piston. Depending on the heads and headgaskets used this can come down to about 9.0:1.

I think between the two I would take a 2.3 and slightly lower CR than the 2.1.
jamal is offline   Reply With Quote
Old 01-30-2019, 07:24 PM   #316
subtle_smoker
Scooby Newbie
 
Member#: 459085
Join Date: Dec 2016
Location: Richmond, VA
Vehicle:
1998 Impreza
Blue

Default

Quote:
Originally Posted by FuJi K View Post
Here is a stock 2.5L EJ255/EJ257 B25 combustion chamber to a 97mm bore.
Is this misrepresented as either a D25 head or 99.5mm bore?
subtle_smoker is offline   Reply With Quote
Old 05-27-2020, 03:54 PM   #317
FuJi K
Scooby Guru
 
Member#: 3687
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: St. Paul, MN
Vehicle:
MY99 GF4 JDM 6spd
NF Performance

Default

Quote:
Originally Posted by subtle_smoker View Post
Is this misrepresented as either a D25 head or 99.5mm bore?
That's a B25 head on an EJ22T block.
FuJi K is offline   Reply With Quote
Old 05-27-2020, 08:53 PM   #318
scruff3333
Scooby Newbie
 
Member#: 380863
Join Date: Feb 2014
Location: wetside washington
Vehicle:
94 ss
red

Default

Now, I've gotta read this thread again.
Love it.
Thanks Fuji.
scruff3333 is offline   Reply With Quote
Old 05-23-2023, 10:51 AM   #319
FuJi K
Scooby Guru
 
Member#: 3687
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: St. Paul, MN
Vehicle:
MY99 GF4 JDM 6spd
NF Performance

Default

TTT

do people even read the stickies anymore?
FuJi K is offline   Reply With Quote
Old 05-23-2023, 12:30 PM   #320
kakarot09
Scooby Specialist
 
Member#: 182375
Join Date: Jun 2008
Chapter/Region: SWIC
Location: Northern Nevada
Vehicle:
2013 Sti
World Rally Blue

Default

Quote:
Originally Posted by FuJi K View Post
TTT

do people even read the stickies anymore?
I think there are still people who refer back to them but some of them have images that are gone, links that don't work etc.
I think this is a great reference you made though. Seems like in general the forums are less used now. For whatever reason people seem to have migrated to social media. It's a shame because nothing is organized on social media like it is on the forums. The search ability is trash etc.
kakarot09 is offline   Reply With Quote
Old 05-25-2023, 10:55 AM   #321
bucket7788
Scooby Specialist
 
Member#: 124263
Join Date: Aug 2006
Chapter/Region: MAIC
Location: Now with DB Super 16g and WI!
Vehicle:
2004 WRX Wagon
RomRaider + UTEC Tuned

Default

Quote:
Originally Posted by FuJi K View Post
TTT

do people even read the stickies anymore?

I do occasionally, though not like the old days. There is still a wealth of information here. Some of it is out of date or broken links make it hard to use. Others are still perfect.


It is a shame social media has largely replaced forums.
bucket7788 is offline   Reply With Quote
Old 12-07-2023, 12:12 AM   #322
ifranbmz
Scooby Newbie
 
Member#: 536310
Join Date: Dec 2023
Wink ej22e 1993

hi guys, so my legacy ej22 1993, is starting to knock, so i got an ej22e (1993) phase 1 engine block sitting in my garage. also i did purchase the set of darton performance sleeves kit for this block, These sleeves are delivered with a 97mm bore, but can be bored to 100mm maximum. also a friend gift me a 1998 impreza ej25 phase 1 engine crankshaft! this one has thrust bearing on #3 main. but this crank has 48mm rod journal bearings, and the ej22 has 52mm.

so i got ej22 soon sleeved, bored to 99.5 (to fit 2.5 pistons)

ej25 1998 phase 1 crankshaft, this will increase the stroke from 75mm to 79mm

which RODS-PISTONS should i buy? if im not wrong with all my reading, i think is

1998 rod lenght rods w/ 1.890" (48.0mm) OE rod journal diameter
and phase 2 ej25 pistons (IM NOT SURE HERE)

can someone point me which 48mm rods do i need and pistons that will not change the compression rattio of the chambers please.

mostly i want the engine to be sleeved and with forged rod/pistons for nostalgia! also i want to turbo it next year with at least 10psi.

what are your suggest?
ifranbmz is offline   Reply With Quote
Old 12-07-2023, 04:37 PM   #323
monkeyposeur
Scooby Specialist
 
Member#: 333468
Join Date: Sep 2012
Chapter/Region: RMIC
Location: SLC, UT
Vehicle:
93 SS - 06 OB XT
03 WRB GD 205/22T 20G-XT

Default

Quote:
Originally Posted by ifranbmz View Post
mostly i want the engine to be sleeved and with forged rod/pistons for nostalgia! also i want to turbo it next year with at least 10psi.
Holy crap, that is so overkill for only running 10 psi!
monkeyposeur is offline   Reply With Quote
Old 12-09-2023, 07:31 PM   #324
ea82guy
Scooby Newbie
 
Member#: 536331
Join Date: Dec 2023
Default

Nice !
ea82guy is offline   Reply With Quote
Old 01-09-2024, 08:45 AM   #325
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Milton Keynes, UK
Vehicle:
96 3MI Racing
search FIRST, then PM!!!

Default

Woooo buddy, I have not logged on in a long while. I use to pop on regularly when I still had the app on my phone but they killed the app

Quote:
Originally Posted by bucket7788 View Post
I do occasionally, though not like the old days. There is still a wealth of information here. Some of it is out of date or broken links make it hard to use. Others are still perfect.

It is a shame social media has largely replaced forums.
Yeah, imagine if Nick had allowed us to host pics on the forum server instead of from someone's now broken storage. All of my old pics and tutorials are now dead as Photobucket decided to want to charge money.

I do have the old pics, so maybe I'll go back and start rehosting the pics.

And yes, Facebook is the absolute worst for the typical chats and questions, and the search function is particularly bad.

Quote:
Originally Posted by ifranbmz View Post
which RODS-PISTONS should i buy? if im not wrong with all my reading, i think is

1998 rod lenght rods w/ 1.890" (48.0mm) OE rod journal diameter
and phase 2 ej25 pistons (IM NOT SURE HERE)

can someone point me which 48mm rods do i need and pistons that will not change the compression rattio of the chambers please.
So the phase 1 EJ25 is kind of an odd duck as it was short lived and the 48mm journals don't handle power so well. It really doesn't have a strong aftermarket support.

I would suggest getting a phase 2 crank and then rods and pistons are abundant. That or stick with the 75mm crank and run it as a long rod 2.34 ("destroker").

Shoot, you can just buy a used EJ255/257 block for basically two 12 packs of beer now. Just get it freshened up as an EJ25 or destroke to a 2.34. Then you'll have the #5 main location thrust bearing, compared to it being on #3 in phase 1 engines, the better PCV ventilation, and save yourself a lot of headache and expese. If you really want to sleeve, they can still go into the EJ25 block.

Quote:
Originally Posted by monkeyposeur View Post
Holy crap, that is so overkill for only running 10 psi!
+2 to this. Massive overkill and a big expense for that small of a power goal.

Last edited by Homemade WRX; 05-03-2024 at 08:41 AM.
Homemade WRX is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
nj building n00b wants to build his own gaming desktop NJSwamplands Off-Topic 11 01-29-2010 03:50 PM
I want to build my engine... HELP! usmc 04sti Built Motor Discussion 1 08-30-2008 01:04 PM
to build up my 2.0 or to build a 2.5 pulser9 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 13 05-19-2007 08:13 PM
Wanting To Build Engine But Have Questions wrxxer Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 0 10-04-2003 12:15 PM
I want to build a rally car... but I don't know where to start. majglow Motorsports 25 04-24-2002 12:55 PM

All times are GMT -4. The time now is 04:47 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.