Welcome to the North American Subaru Impreza Owners Club Thursday March 21, 2019
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

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 02-18-2019, 10:16 AM   #1
rubbachicken
Scooby Newbie
 
Member#: 311093
Join Date: Feb 2012
Default is it possible to make an EJ25 non interference

As the title suggests, I'm about to rebuild my first EJ, knowing the EJ22's are non interference, I would like if possible to make it non interference if possible, it going into a manual transmission vehicle, and I always leave it in gear, I know there's a guide that goes over the cam sprocket to protect it, in the event that someone hits the car while parked, I figure it would require some machine work to the piston crowns, but that in turn would lower the compression ratio, is there something I can do to counter act.
Please don't replying you are going to give me a hard time.
Thank you in advance.
* Registered users of the site do not see these ads.
rubbachicken is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 02-18-2019, 04:26 PM   #2
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

Sure.......
It will likely be expensive.
It will kill what some already call low performance.
The timing belt guides are not to "save things if the car gets hit while in gear". The guides are to keep belt timing in MT's, I believe the AT's don't have timing belt guides.

So, I find it hard to give any advice on making ANY Subaru engine non-interference AND keep any performance.

BTW, most 2.2's are also interference.
Charlie-III is offline   Reply With Quote
Old 02-19-2019, 09:46 PM   #3
CosmoTheCat
Scooby Newbie
 
Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
Vehicle:
98 My FMIC
Is bigger than yours.

Default

pre-97 anyway. Apparently the 98+ 2.2s are interference.

And the guide is to keep the belt from floating when you hit 2nd on the freeway in a botched downshift.
CosmoTheCat is offline   Reply With Quote
Old 02-19-2019, 10:59 PM   #4
Blktrax
Scooby Specialist
 
Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: West, NC
Vehicle:
2002 WRX 223K Mi.

Default

Belt guides = keep timing belt on sprockets during operation in instances of haromincs and the belt Flaps, all belts over any length will do this over their longest span. The tensioner keeps load but the belt will still move. Also when the engine is started and shut down during very low speed operation , when cams load and unload the belt heavily and slowly.

Manual trans cars get the guide over the crank due to the nut behind the wheel using the clutch. Heavy shock loads from upshift/downshifts quickly causing load shifts on the crank and cams. Engine 7000rpm cams 3500rpm no lift shift into second. Engine drops 3000rpm almost instantly, mass of the cams still spinning. Belt shock load....

Want to make a non interference EJ just have a custom crank made, destroke it down to 1.8L . Canít hit valves if the piston canít reach. Rebalance the engine and spin it to11k.

https://m.youtube.com/watch?v=1UwI-Rtuc38

Last edited by Blktrax; 02-19-2019 at 11:05 PM.
Blktrax is online now   Reply With Quote
Old 02-21-2019, 04:37 PM   #5
wtdash
Scooby Specialist
 
Member#: 59182
Join Date: Apr 2004
Location: N. Idaho
Vehicle:
2002 WRX GG>>
2016 Focus RS

Default

What type of 2.5? SOHC or DOHC. DOHC can still have valve interference, correct? Regardless of where the piston goes?

'96-'99 EJ25D are DOHC. All other NON-turbo EJ's '99+ are SOHC-EJ251, 252, 253.

Last edited by wtdash; 02-23-2019 at 11:59 PM.
wtdash is offline   Reply With Quote
Old 02-21-2019, 07:00 PM   #6
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

Quote:
Originally Posted by wtdash View Post
What type of 2.5? SOHC or DOHC. DOHC can still have valve interference, correct? Regardless of where the piston goes?

'96-'99 EJ25D are DOHC. All NON-turbo EJ's '99+ are SOHC.


This thread is about a 2.2L.
AFAIK, pretty much ANY Subaru engine from mid '90's and up are interference engines, regardless of displacement.
Charlie-III is offline   Reply With Quote
Old 02-21-2019, 07:21 PM   #7
wtdash
Scooby Specialist
 
Member#: 59182
Join Date: Apr 2004
Location: N. Idaho
Vehicle:
2002 WRX GG>>
2016 Focus RS

Default

Actually...title in OP:
Quote:
is it possible to make an EJ25 non interference
Assuming they were using the non-interference ('89-'96) EJ22 as a reference only?
wtdash is offline   Reply With Quote
Old 02-23-2019, 11:15 PM   #8
rubbachicken
Scooby Newbie
 
Member#: 311093
Join Date: Feb 2012
Default

Well I guess I got my answer, thank you to all who took the time.
rubbachicken 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

All times are GMT -4. The time now is 10:43 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.