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Old 08-06-2017, 10:51 PM   #1
nateperwrx
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Member#: 472423
Join Date: Aug 2017
Default EJ205 knocking and rebuild. Newbie needs help!

It happened. I got the knock! I have a 2005 wrx with about 110k miles on it.
Mod list:
Cobb catback with catless cobb downpipe
Cobb short ram intake
Cobb stage 2 map
Perrin top mount intercooler
R1 slotted brakes
ISC N1 coilovers

If I had to guess i'd say it's a rod bearing. It doesnt knock while idling but as soon as you rev pass 2k you can hear it loud and clear. I'm strongly looking towards the rebuild route even though I have never rebuilt an engine yet. My end goal is to have a strong reliable motor and if my funds work out i'd like to get alittle bit more power out of it. I'm thinking like a solid 350 to the crank. Looking for some advice on what parts i should replace to really get that reliable goal. I'd rather not deal with the engine again for a long time!

If anyone could give me a general Idea on how much im looking to spend that'd be a huge help too! Money is a concern but of course i want to do this right so if I have to be patient with the funds then that's fine

Also are these type of kits worth looking into?
http://www.6starspeed.com/ejhipemareki.html

Thanks in advance for the help!
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Old 07-20-2018, 01:35 AM   #2
RyanBlobeye
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Member#: 482101
Join Date: Feb 2018
Location: Kentucky
Vehicle:
2004 Subaru WRX
Blue

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Iím currently having the same issue, and Iím going the rebuilt route. Instead of buy a new motor, rebuilding would be cheaper in the long run. Iíd start with actually diagnosing whatís wrong with it first. Bent rod, piston rings, could be many things.
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Old 07-25-2018, 06:10 PM   #3
contaminatrix
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Member#: 435611
Join Date: Dec 2015
Chapter/Region: International
Location: Nairobi
Vehicle:
2002 SG5-2.0-XT-JDM
45A, originally 18L

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^ this. start by finding out the issue. get some forged stuff - rods, pistons heads....such like.

but in the meantime you can take the engine out and give it a critical look; cleaning, tightening and replacing what you see.

have fun. i know i would :-)
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Old 07-30-2018, 01:58 PM   #4
subaru_gc8
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Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

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Quote:
Originally Posted by RyanBlobeye View Post
I’m currently having the same issue, and I’m going the rebuilt route. Instead of buy a new motor, rebuilding would be cheaper in the long run. I’d start with actually diagnosing what’s wrong with it first. Bent rod, piston rings, could be many things.
uhhh rebuild is not cheaper. if you are staying within the stage 2ish power level, the cheapest route is a stock short block from subaru. last i checked they were under or right around $2000.

so I had a 2.1 stroker with v9 heads, which if you are going to do a rebuild is the route you should take.. so I believe i have spent around $8000 so far without the turbo kit. believe me rebuilding forged is not cheap.

Last edited by subaru_gc8; 07-30-2018 at 02:03 PM.
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Old 07-30-2018, 06:43 PM   #5
MortonCharbo
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Member#: 487057
Join Date: Jun 2018
Chapter/Region: BAIC
Location: California
Vehicle:
2002 WRX Wagon
Silver

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Just adding some info, not sure if it's what caused your problem or not. The Cobb stage 2 map is meant for use with the catted downpipe, not the catless. That could possibly lead to problems if you use it long term.
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Old 08-03-2018, 09:18 AM   #6
Charlie-III
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Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

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You guys do realize the OP started this thread last year, right?
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Old 08-04-2018, 12:02 PM   #7
MortonCharbo
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Quote:
Originally Posted by Charlie-III View Post
You guys do realize the OP started this thread last year, right?
Yet you commented too

If I come across a thread in my searches while looking for something, and I have something to add to it, I do. If I came across it, someone else could too. Maybe my input might help someone.
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Old 08-04-2018, 01:33 PM   #8
Charlie-III
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Location: USA, North NJ, 07456
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1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

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Quote:
Originally Posted by MortonCharbo View Post
Yet you commented too

If I come across a thread in my searches while looking for something, and I have something to add to it, I do. If I came across it, someone else could too. Maybe my input might help someone.
True, but some peeps do a search, don't see how old the thread is, don't look at the OP profile to see they haven't been on for months/years and maybe expect an answer.
Got it?

Not slamming, new info is always good, may help the next peep.

Hey, thanks for adding.

Wish peeps would close out threads with a fix. Way too many dead end threads on many forums.


PS, yes, I have been caught by a necro thread, didn't read all dates but replied. It popped up, later I just shook my head at my own reply.
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