Hi guys, im not yet a subaru owner but looking to get a subaru running again. a friend of mines got a 2002 legacy gt 5 spd no rust but theres a knock in the engine so its pretty much dead...a few days later i deiced to stop in at a junkyard looking for honda parts and theres this 2011 subaru side swiped wrx and they only want $1500 for the motor since tranny is junk. now the question is can i swap the 2011 motor into the 02 legacy with no problems or what will i need? thanks in advance also i would like some reply someone else steals the deal.

Definately will require lots of work arounds.....

 

Almost would need to piggyback the thinner down harness from the 2011 to make it work.

 

I don't think an N/A 2002 ECU will run a 2011 Turbo enigne.......

 

too much trouble.

 

FWIW....the 2.5 of that era uses very short pistons and they sometimes slap.  If the knock is loudest at startup, but then tapper off or stops after warm it's piston slap nad the enigne will still last a long time.

your right it does stop when its warm enough....thanks a bunch!! you just saved me BIG bucks =D but still it worries me sometimes...how can you fix it? higher octane gas?

Replace the piston.

 

Or just leave it and let it warm up before driving hard.