GROUNDED - Starting an EJ205 Rebuild - Subaru WRX Forum
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#1 Old 06-25-2014, 09:17 AM
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GROUNDED - Starting an EJ205 Rebuild

It's not fabulous to be without a personal auto.

Looks like I've spun a bearing at 252,000 km and therefore need a rebuild. I have started working on it previously with a performance shop (Touge Tuning » Subaru and Japanese Performance Specialty Shop) in anticipation of a rebuild.

At the moment I have:

1. Rebuilt heads with cams,
2. Spare EJ205 shortblock with oil pan,
3. Gates timing belt kit, and
4. OEM Cam and front crank seals.

I want to rebuild it for tracking, but I’m not planning power upgrades past Stage 2. Intend to deliver what I have to my performance shop, get a rebuilt long block with timing belt kit installed, and then help my mechanic remove and replace the engine in my gf's driveway when the longblock is ready.

I think I prefer:

5. 4032 alloy forged pistons,
6. ARP head studs, and
7. 'toilet seat' baffle oiling mod.


Internal components Needed
-New Bearings (Rod and Main)
-Forged Pistons
-ARP Head Studs
-Head Gaskets
-Seals

Should the oil pickup be replaced as well, and what else should I consider?

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#2 Old 06-25-2014, 10:59 AM
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I would surely use a new oil cooler. Those can trap debris from motor damage and are virtually impossible to clean out.

I would also consider some coatings. Check out swaintech for this. A new oem crank would be a worthy consideration as well.

What is a toilet seat mod?

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#3 Old 06-25-2014, 09:42 PM
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This is the 'toilet seat' custom oil pan mod, I was referring to.

It's sandwiched between the block and oil pan when assembled, and prevents oil from running up the edges of the oil pan in hard cornering.
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#4 Old 06-25-2014, 09:55 PM
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Ahh...I see now. :thumbup:

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#5 Old 06-28-2014, 08:45 AM
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Picked up a good used set of '04 STi con rods for a sturdier EJ205 build.

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#6 Old 07-09-2014, 08:48 AM
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Pulling out the spun bearing EJ205 this weekend.



Spare short block being sent to the builders Thurs when all the parts arrive:

-New Bearings - King
-Forged Pistons - Mahle
-ARP Head Studs
-Head Gaskets - Cometic
-Seals
-Crank - Re-Use Original
-Rods - Use '04 STi rods
-KillerB oil pickup
-KillerB oil baffle





Happy that it's being rebuilt by Canada's version of Crawford Performance, Gord Bush Performance.

http://www.gordbushperformance.com/

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#7 Old 07-14-2014, 11:51 AM
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Shipped the old EJ205 to Touge Tuning for parts swap to the rebuilt motor.



Collecting the fluids for reinstall. Going with a 20 minute oil change, followed by a 1,000 km oil change.


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#8 Old 07-17-2014, 05:20 PM
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Did they check the crank to make sure it was ok? Sometimes it can get warped if it was ran for a while with the bearing going out.

Kirt
378awhp/373wtq Custom Dom 3 & CBRD tuned 2006 STI.
"When in doubt...flat out" - Colin McRae
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#9 Old 07-20-2014, 07:55 PM
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Kirt,
The spare short block has 130,000 km on it and hasn't spun a bearing, so that step won't be required. However, the builder will document all the clearances.

If I eventually rebuild the short block that has spun a bearing, we'll check out the crank and block for damage as you suggest.

Thanks,

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#10 Old 07-21-2014, 08:20 AM
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Going with the 4032 Al allow forged pistons for this build, but here's some tech trivia on forged piston alloys:

TECH5: Trey McFarland of Mahle Motorsports Reveals Piston Secrets - EngineLabs
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#11 Old 07-25-2014, 09:36 AM
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Spare shortblock was opened up and confirmed that it too has spun bearing issues, requiring a crank- or crank repair- and connecting rod. We had planned to upgrade the con rods with STi items so that's not an issue, and will now replace the crankshaft with an OEM item. Build budget just went up by $550 CAD plus tax.

"The OEM forged steel crankshaft from Subaru is quite good quality and can be used for reliatively high performance engine builds without concern. 2.0L applications use a 75mm stroke. STI Version 8 and newer crankshafts are generally surface hardened and feature cross-drilled mains to improve the oil flow to the rod bearings.

Usually ships in 1 to 2 weeks.
Manufacturer: Subaru" [RalliSpec]


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#12 Old 08-20-2014, 10:08 AM
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Built motor has arrived.




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Last edited by LW_Black4; 08-20-2014 at 10:22 AM. Reason: Add specs
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#13 Old 08-20-2014, 10:51 AM
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Its like Christmas mourning!

Good luck man.
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#14 Old 08-22-2014, 09:16 AM
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From bobistheoilguy.com:

Built EJ205 + Specs - Understanding Break-in Procs

"You'll find many different recommendations for breaking in a built EJ engine. Here's Cobb's recommendations:

Technical Articles

The most popular break-in oil is probably Rotella 15W-40 so you're on the right track there. Motul, Amsoil, and RP break-in oils are good as well. Most don't switch to synthetic until after some of the initial short intervals.

And the Built Motor forum at nasioc is a good resource:
Built Motor Discussion - NASIOC

Just don't be one of those guys that doesn't follow the builders' advice and ends up needing a rebuild.

-Dennis"

I was planning to run this Rotella T for the recommended break in:

1. 20 min oil change - warm for 10 min, run at 2000 rpm for 5,
2. 100 km oil change - intentionally vary the rpms constantly in this first drive, but do not to exceed 5500 rpm, and
3. 1000 km oil change - avoid constant rpm running.


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#15 Old 08-24-2014, 10:45 PM
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We are back in action after 2 months without wheels. Man I miss driving this machine!





A bad clutch release bearing caused a few dry run installs which wasted time, but aside from that it went smoothly after we got the built motor.

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