hybrid build
+ Reply to Thread
Results 1 to 6 of 6

This is a discussion on hybrid build within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; so long story short my motor is gonna blow soon, I have the chance to get a ej257 block for ...

  1. #1
    Registered User
    Join Date
    Mar 2015
    Posts
    28

    hybrid build

    so long story short my motor is gonna blow soon, I have the chance to get a ej257 block for $175 dude said it was losing compression in one cylinder and thinks the rings are fried, if I decide to get the block what heads would I need and do they need machined to match the block ? and what other things would I need. I'm not looking to make crazy power probably 300 whp.

  2. Remove Advertisements
    ClubWRX.net
    Advertisements
     

  3. #2
    Actually a SuperSpy. Take Care. SD_GR's Avatar
    Join Date
    Jul 2002
    Location
    CA, US
    Posts
    26,286
    I Support ClubWRX
    WRX Info Links, Courtesy TheJ
    “... you can't get away from yourself by moving from one place to another.” Ernest Hemingway, The Sun Also Rises
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

  4. #3
    OMG WTF MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    10,083
    I Support ClubWRX I Support ClubWRX
    You can use just about any phase 2 head, and you can choose to machine them or not.. it's all up to you, your goals, and your budget.

  5. #4
    Registered User
    Join Date
    Mar 2015
    Posts
    28
    Quote Originally Posted by MainFrame View Post
    You can use just about any phase 2 head, and you can choose to machine them or not.. it's all up to you, your goals, and your budget.
    I'm trying to build a reliable motor but also have some power will machining them make them more reliable because I heard they're prone to knock along with compression issues if you dont

  6. #5
    zax
    zax is offline
    Medicum Physicum zax's Avatar
    Join Date
    Nov 2008
    Location
    Neverland Ranch, Maryland
    Posts
    16,753
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by mason04wrx View Post
    I'm trying to build a reliable motor but also have some power will machining them make them more reliable because I heard they're prone to knock along with compression issues if you dont
    If you want to place priority on reliability and longevity, consider a lightly used OEM longblock. Built motors simply don't last as long as OEM counterparts in most scenarios.
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
    Zax's utterly stock 2015 STi - Seeking B-Stock supremacy
    Zax's Shaggin' Wagon (SOLD)

    Zach | Moderator | Builds, Electronics/Car Audio, Engine Modifications, Mid-Atlantic States, Suspension & Wheels, Tech & Modifying & General Repairs |
    Rollin' with the Bugeye Mafia #302
    Facebook me here

    Your Mid-A local board: http://www.clubwrx.net/forums/mid-atlantic-states/

  7. #6
    OMG WTF MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    10,083
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by mason04wrx View Post
    I'm trying to build a reliable motor but also have some power will machining them make them more reliable because I heard they're prone to knock along with compression issues if you dont

    There are a couple different ways to go about lowering the compression ratio ("hybrid" pistons, thicker head gasket).. Although in my opinion, machining the head chambers to match the volume and profile of the 2.5L STI head chambers would be the best way to go about it. I've done it using thicker head gaskets in the past and it worked fine, but my engine had other problems and eventually I went ahead and had the chambers worked over for the last build I had done.

    You never said what kind of car this is, but I'm assuming 2004 WRX.. the easiest (and cheapest) way to do it would be to have your existing ej205 (s20) heads rebuilt and chamber matched.



    Quote Originally Posted by zax View Post
    If you want to place priority on reliability and longevity, consider a lightly used OEM longblock. Built motors simply don't last as long as OEM counterparts in most scenarios.

    I would go one step beyond that and suggest picking up a new ej257 shortblock from Subaru. You're looking at around $1800 out the door, and not have to worry about how it was treated in its previous life or if your machine shop/assembler messed up somewhere along the way.

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself. We strongly suggest that you stay away from using aol, yahoo, msn, and hotmail accounts. Sometimes the mail server blocks the emails from our server. As a result you will not receive any notifications including the confirmation email.

Please select your insurance company (Optional)

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •