Replacing pistons
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This is a discussion on Replacing pistons within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Ok I want to replace my stock pistons in my 2011 STi for two reasons 1) because I think I ...

  1. #1
    Registered User sjcurtis's Avatar
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    Replacing pistons

    Ok I want to replace my stock pistons in my 2011 STi for two reasons 1) because I think I have a cracked ring land and 2) because I would like to try to get more power (350whp) and not have to worry about the stupid stock pistons. From what I have seen the stock STi rods are fine for the power that I want, also I see that the main problem of building our motors is spinning the main bearings. So my question is can you replace the pistons without seperating the block halfs? I have seen how the motor is put together and the pistons are put in after the two halfs of the block is bolted together so I would think that you could reverse the procedure. If the ring lands have not broke off and the cylinder walls still look good would it be ok to just pull the old pistons out and replace them with some good forged pistons, bolt eveything back togehter with new gaskets of course and call it a day?

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  3. #2
    Master Baiter EJ257's Avatar
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    You can do drop-in pistons. It's a middle ground between stock and a built/balanced shortblock. Personally, if you're going through the effort of pulling the motor, I'd just do a full refresh/rebuild.
    2005 WRX STi (Mods | Virtual Dyno)

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  4. #3
    Registered User sxcrxy's Avatar
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    Quote Originally Posted by EJ257 View Post
    You can do drop-in pistons. It's a middle ground between stock and a built/balanced shortblock. Personally, if you're going through the effort of pulling the motor, I'd just do a full refresh/rebuild.
    +1 build it proply less problems in the future stay safe

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