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Old 12-09-2012, 08:17 PM   #1
eric richardson
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Default Blown motor, time for a rebuild!

Well three weeks ago I bought this 2007 STI with 73,000 miles. all stock, its been a blast to drive, handles amazingly etc.


Last week I bought a cobb ap and a catback exhaust, flashed cobbs 93 stage 1 tune. All was well for the first two days then all of a suddin on the way to work on the 3rd day I get a CEL for cyl 4 misfire, GREAT!! I had the feeling it was the worst, (cracked piston) so i checked the oil fill cap to find this;

http://i860.photobucket.com/albums/a...87F04E8767.mp4

the car still ran great it just had the cel, so i babyed it to work and back on the forth day, still good, a little puff of exhaust smoke at start up.

on the 5th day in the morning when i started it i get this!!!!







Im dumbfounded as to what made this happen or exactly whats wrong bud id guess its the piston?

ill be tearing into it later this week to see what happened...

next question:

Im wanting to do a forged bottom end, basically just pistons and rods and a freash rebuild. I was looking at buying an assemebled short block but not exactly where i should buy from? Ive concidered MAP Performance, or Element Tuning, but id like to here what places have great reviews for short blocks?
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Last edited by eric richardson; 12-16-2012 at 09:31 AM.
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Old 12-09-2012, 08:56 PM   #2
drewvdw
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Let me get this straight...You kept on driving it AFTER you figured out that a ringland was shot...

Call Dom at Maxwell Power Services.
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Old 12-09-2012, 09:07 PM   #3
Dillinja666
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Put a strobe light and a sound system in your garage and you're set! Sorry for you loss...
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Old 12-09-2012, 09:27 PM   #4
UK-Wagon
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Turbo may have blown up, its common! Stop letting it run unless you absolutely have to, but dont drive more than a few yards.

What likely happened here is;
Car was stock and drivin lightly, you got it as stated.... then modded it. Guessing you ran it up pretty high as any of us would do. This likely dislodged some oil oil debris or build up. It got caught in the OCV Screen before the turbo! This clogged the very very fine mesh screen and starved the turbo of oil. The turbine shaft seized & broke, and thus some oil is blowing right out the turbo housing and into the exhaust.

First, pull the down pipe off. Check for shaft pay or look in the turbo from under the car and see if the turbine is totally F*ed and just rattling around. If it is, pull the turbo get a new one and remove the OCV screen on the passenger side! Also remove the oil pan and clean it/check for debris. Many times when the turbos blow in this manor some of the journal bearing will go down the oil return tune and get down in the pan. Some can be small enough to get into the oil system and destroy bearings and cam journals. You can take the pan off with the engine in the car quite easily.

Last edited by UK-Wagon; 12-09-2012 at 09:34 PM.
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Old 12-09-2012, 09:29 PM   #5
eric richardson
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My last car was a champ, Turbo Lexus IS300, made 420whp on a stock 155k org motor. then this car blows with just exhaust and a mild stage 1 reflash? garbage, I should of done more reaserch before buying one of these.

i wasent for certian but guessing it was the piston from all the threads about this, stuff happens, Time for a built motor and a pro tune, im in too deep to back out now.
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Old 12-09-2012, 09:33 PM   #6
sense of nature
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No way that's the turbo u have exhaust gas going past the rings & into the crankcase.. hence, smoke outta the oil filler.
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Old 12-09-2012, 09:36 PM   #7
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Quote:
Originally Posted by sense of nature View Post
No way that's the turbo u have exhaust gas going past the rings & into the crankcase.. hence, smoke outta the oil filler.
This! Just happened to a friends wrx. Same run down.
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Old 12-09-2012, 09:42 PM   #8
UK-Wagon
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Quote:
Originally Posted by sense of nature View Post
No way that's the turbo u have exhaust gas going past the rings & into the crankcase.. hence, smoke outta the oil filler.
If there is smoke coming out the oil fill, then yes its mush worse. OP fix the link, it just goes to the pic of your smoking exhaust.
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Old 12-09-2012, 09:43 PM   #9
HinshawWRX
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So you had a complete inspection to include compression and leak down tests, right?
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Old 12-09-2012, 09:52 PM   #10
drewvdw
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Don't blame Subaru, blame yourself or the previous owner(s).
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Old 12-10-2012, 07:28 AM   #11
eric richardson
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The car is parked now and ill be doing some testing later this week after work. Well see how that goes, till then ill be pricing out rebuild options.
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Old 12-10-2012, 12:57 PM   #12
Decipher
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I genuinely hope you have some money saved up. This is going to be expensive. Sorry man. I hate reading this. You obviously researched the cars so you knew about potential issues. You also should have read that a compression and leak-down test are a small but very necessary expense. Good luck.
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Old 12-10-2012, 02:16 PM   #13
eric richardson
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So I've been pricing parts, so far here is what I have came up with:
New sti short block - $1816.57
New sti gasket set - $266.66
New sti timing kit. - $127.46
New sti water pump- $124.06
New CP forged pistons $621.81
Head cleaning/ valve job- $170 per head.

Last edited by eric richardson; 12-10-2012 at 02:25 PM.
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Old 12-10-2012, 02:39 PM   #14
drewvdw
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MPS powered.

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Oil
TOB
Motor and tranny mounts (?)
Oil pickup tube (Killer B)
Clutch (?)
Flywheel/resurfacing

I'd also try to get that shortblock honed using a torque plate before dropping in the pistons.
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Old 12-10-2012, 03:08 PM   #15
04ScoobyWtf
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Did you buy the car from a private seller or a dealer because I would go legal on someone's @$$
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Old 12-10-2012, 03:58 PM   #16
Shortpersonbk
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Quote:
Originally Posted by 04ScoobyWtf View Post
Did you buy the car from a private seller or a dealer because I would go legal on someone's @$$
LOL unless the dealer/prev owner screwed the car and then gave it to him you can't do anything legal.


He modified the car took the gamble and lost welcome to life.
On top of the modifications he drove the car for a couple WEEKS before anything went wrong.

Good luck with the fix, hope you have another car you could use as a DD while waiting. Are you just going to rebuild for stock or go big ?
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Old 12-10-2012, 04:45 PM   #17
Decipher
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Quote:
Originally Posted by Shortpersonbk View Post

LOL unless the dealer/prev owner screwed the car and then gave it to him you can't do anything legal.

He modified the car took the gamble and lost welcome to life.
On top of the modifications he drove the car for a couple WEEKS before anything went wrong.

Good luck with the fix, hope you have another car you could use as a DD while waiting. Are you just going to rebuild for stock or go big ?
Exactly. Gotta love the general lack of accountability by some people. I bet he takes his car back to stock before going to the dealer, too. Own up, 04scoobywtf. Stuff happens and sometimes it's actually YOUR fault.
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Old 12-10-2012, 06:32 PM   #18
eric richardson
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I bought the car from a privet seller, the cars been great till I modded it, therefore it's my fault, things happen. The listed items above would be a good idea also.

All I'm doing is the forged pistons, and a new clutch. Nothing more I'd love to go all out on this one but it's cought me off gaurd and I don't have the funds to go too crazy.
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Old 12-10-2012, 06:37 PM   #19
eric richardson
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What is a "TOB"??
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Old 12-10-2012, 06:39 PM   #20
207STi
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Quote:
Originally Posted by eric richardson View Post
What is a "TOB"??
guessing throw-out bearing.
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Old 12-10-2012, 06:40 PM   #21
drewvdw
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MPS powered.

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Throwout bearing. They're notorious for going bad, but if you're getting a new clutch, it'll probably come in the kit.

You really do need to look into the Killer B oil pickup. You don't want to kill your engine again.
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Old 12-11-2012, 04:13 AM   #22
Spec R
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ouch sorry to see this happen.

i too came into the subaru world expecting some a similar level of durability from previously owned cars, but have realized otherwise.

best of luck!
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Old 12-11-2012, 06:40 AM   #23
FCmaniac
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Here are some options for preassembled shortblocks with forged pistons instead of buying a new OEM shortblock and putting your own forged pistons in -
Rallispec - $3500 (includes Cosworth pistons and Manley rods)
AWD Tuning - $2900 (from IIR, includes Arias pistons and ACL bearings)

You could also send your shortblock to CNC Engine Dynamics and they'll rebuild it with CP pistons for $2285.
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Old 12-14-2012, 09:04 PM   #24
eric richardson
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Tonight I did a compression test, I let the car warm up first. I was suprised to see that there was very little to No smoke coming out of the exhaust, it still has quite a good volume of air coming out of the oil cap.

I let the motor turn over 5-10 times per test and I used a Matco tools compression test gauge.

So here are the results

Cylinder 1 95psi
Cylinder 2 100psi
Cylinder 3 105psi
Cylinder 4 85psi
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Old 12-14-2012, 11:05 PM   #25
HinshawWRX
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Yup, new motor time.
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