Welcome to the North American Subaru Impreza Owners Club Saturday December 27, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Subaru Conversions

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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 08-01-2008, 02:19 AM   #1
Sean2.5Black
Scooby Specialist
 
Member#: 150647
Join Date: Jun 2007
Chapter/Region: NWIC
Location: Beaverton, OR
Vehicle:
98 Impreza 2.5RS
Ej20G hybrid

Default Help!!! EJ20G/RS frankie

Hey guys, I'm here basically to make sure I don't forget anything while doing the swap....
I'm swapping an ej20g short block with my PnP DOHC RS heads into my '98RS with Delta mild cams.
This may be a stupid question/inquiry but I've never done it before, so I really have no idea where to start lol.

I'm drilling/tapping the heads for the oil lines for the turbo, and using my RS intake manifold for the EGR bypass, since I'm OBDII lol.

Here's my list so far:
RS Head gaskets
Exhaust gaskets
Cam cover gaskets
ACT clutch set
Stock UP
3'' Custom TBE
VF10


I feel like I'm missing a couple huge things.... So don't laugh too hard @ me
* Registered users of the site do not see these ads.

Last edited by Sean2.5Black; 08-02-2008 at 06:06 AM.
Sean2.5Black is offline   Reply With Quote
Old 08-02-2008, 04:51 AM   #2
DSM_Outback
Scooby Specialist
 
Member#: 56345
Join Date: Mar 2004
Location: Western Colorado
Vehicle:
93 Swapped L
Green

Default

I was going to go that direction until I measured the cloverleaf shaped chamber bore on the EJ25D heads in comparison to the EJ20G bore...large potential for head gasket problems.
DSM_Outback is offline   Reply With Quote
Old 08-02-2008, 06:05 AM   #3
Sean2.5Black
Scooby Specialist
 
Member#: 150647
Join Date: Jun 2007
Chapter/Region: NWIC
Location: Beaverton, OR
Vehicle:
98 Impreza 2.5RS
Ej20G hybrid

Default

Quote:
Originally Posted by DSM_Outback View Post
I was going to go that direction until I measured the cloverleaf shaped chamber bore on the EJ25D heads in comparison to the EJ20G bore...large potential for head gasket problems.
Which headgaskets would you be using? And what if I were to use thicker/thinner gaskets?
Sean2.5Black is offline   Reply With Quote
Old 08-02-2008, 04:58 PM   #4
ciper
Scooby Guru
 
Member#: 15543
Join Date: Feb 2002
Location: san francisco, ca
Vehicle:
90BJ Legacy LS ABS
AWD 946 Rio Red Jpn built

Default

Hes not saying the headgasket is the problem, rather the DOHC head design.
You should plug your numbers into a compression ratio calculator. The DOHC heads have less volume than the original EJ20 heads so the compression ratio will be higher. "RS Headgaskets" is not specific, the DOHC gasket is nearly three times the thickness of the SOHC unit.

If it were me I'd be going the total opposite direction - EJ25 block with EJ20 heads.
ciper is offline   Reply With Quote
Old 08-02-2008, 10:49 PM   #5
Sean2.5Black
Scooby Specialist
 
Member#: 150647
Join Date: Jun 2007
Chapter/Region: NWIC
Location: Beaverton, OR
Vehicle:
98 Impreza 2.5RS
Ej20G hybrid

Default

Quote:
Originally Posted by ciper View Post
Hes not saying the headgasket is the problem, rather the DOHC head design.
You should plug your numbers into a compression ratio calculator. The DOHC heads have less volume than the original EJ20 heads so the compression ratio will be higher. "RS Headgaskets" is not specific, the DOHC gasket is nearly three times the thickness of the SOHC unit.

If it were me I'd be going the total opposite direction - EJ25 block with EJ20 heads.
I meant to say the DOHC heads, forgot to mention that :-X.

I thought about that, and turbo'in my block, but I don't want to look into internals and definately don't want to worry about blowing up the open decked mofo. lol.
Sean2.5Black is offline   Reply With Quote
Old 08-04-2008, 01:58 AM   #6
ciper
Scooby Guru
 
Member#: 15543
Join Date: Feb 2002
Location: san francisco, ca
Vehicle:
90BJ Legacy LS ABS
AWD 946 Rio Red Jpn built

Default

Just for ****s and giggles I'll try to remember to bring a camera with me tomorrow and Ill take pictures of a phase 2 EJ25NA and a 2003 WRX EJ20. I dare you to figure out which is which! The idea that the NA blocks are so much weaker than the turbo blocks (crank/pistons/rods aside) is blown out of proportion on Nasioc.

Either way if you need any extra parts I may have them. I've got a complete DOHC engine and a few WRX engines with different types of damage but lots of good left over parts.
ciper 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
Boost Leak Help EJ20G clean 93 Pre-2002 Factory Turbo Powertrain 5 06-08-2010 09:48 AM
please help ej20g swap in 2000rs ecu not gettingpower GregBolby Subaru Conversions 3 07-23-2009 08:00 PM
Help - EJ20G Data log inside Zora Pre-2002 Factory Turbo Powertrain 23 04-27-2009 11:45 AM
HELP, EJ20G coolant line with RS Radiator? xlur8ed Pre-2002 Factory Turbo Powertrain 6 04-23-2008 04:17 PM
help! ej20g swap single turbo or twin? nmbwhitey Newbies & FAQs 2 03-11-2008 11:15 PM


All times are GMT -4. The time now is 04:11 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.