Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo

Hi, another question- ej25 valves


  • Please log in to reply
5 replies to this topic

#1 xs-sxs

xs-sxs

    Newbie

  • Members
  • Pip
  • 2 posts
  • Idaho

Posted 27 February 2014 - 06:36 PM

I am doing valve replacement on a 1997 dohc ej25 , and I'll have to do valve ajustments too. Really currious to know if the later hydraulic lifters and shorter valves can fit in these heads, It would be nice to just replace the valves, lap them in and put it back together. Ordering shims and waiting to put it together is a pain (every 105k or so).



#2 86BRATMAN

86BRATMAN

    Subaru Master

  • Members
  • 3,412 posts
  • Tazewell Virginia

Posted 27 February 2014 - 07:33 PM

No, the heads are completely different. Nothing from them interchanges.

#3 grossgary

grossgary

    Elite Master of the Subaru

  • Members
  • 20,058 posts
  • WV

Posted 28 February 2014 - 07:22 AM

or - install EJ22 heads instead of the EJ25 heads and use an EJ22 intake manifold and timing belt to match.

probably cheaper than replacing a bunch of valves and no more shim/adjusting madness.



#4 xs-sxs

xs-sxs

    Newbie

  • Members
  • Pip
  • 2 posts
  • Idaho

Posted 28 February 2014 - 12:21 PM

Does that significantly affect comp ratios? intake velosities? Power? Fuel efficiency? Any other benifits besides the hydraulic adjusters?



#5 grossgary

grossgary

    Elite Master of the Subaru

  • Members
  • 20,058 posts
  • WV

Posted 28 February 2014 - 12:39 PM

there are hydraulic and standard screw type adjusters, you can get what you want.

 

compression ratio goes up a bit...i don't get into this for performance modifications so i won't comment on this in terms of performance, though in general it seems most folks like the results. and they'll likely comment in a bit.

 

no annoying valves, improves on the headgasket debacle, cheaper and simpler timing belt and maintenance - all around better. 

 

the EJ22 head bolts are external - so you can have a head off in no time, no removing valve covers, hard to access head bolts, etc.



#6 86BRATMAN

86BRATMAN

    Subaru Master

  • Members
  • 3,412 posts
  • Tazewell Virginia

Posted 28 February 2014 - 02:05 PM

Ej22e heads will bump your compression significantly, near 11:1. Research high compression frankenmotor for more information as to what you'll need to set one up. You'd need a complete donor ej22e to source everything you'd need for the conversion, there is the possibility of swapping on 96 ej25d heads as these are hla heads but that will drop your compression ratio to about 8.5:1 great if you want to turbo it but probably not the most economical option.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users