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Old 04-22-2021, 12:37 AM   #1
pugnaciouspete
Scooby Newbie
 
Member#: 523826
Join Date: Apr 2021
Default Piston Ring and head gasket failure

Got into a perdictament today, tuner told me my 2014 STI has a #4 Piston failure and a head gasket failure. Currently my car is running an AP w/ pro tune and Cobb Turboback exhaust. They are doing a tear down to see what else is going on.

I am trying to figure out what I should do, go OEM or go with a built motor. I don't have power goals, other than wanting to have some fun with the car. My primary goal is reliability and relatively normal maintenance. Can anyone offer any advice on what I should do? Below is what my tuner recommended I do while I am in there making changes.

Start with:
IAG Stage 2.5 closed deck short block
Cobb Intake
IAG or Cobb Fuel Lines and Rails.
Cobb/ID Fuel Injectors (1050x or 1300x2 depending on power level)
Fuel Pressure Regulator
Fuel Pump
EBCS
AOS


Later:
Bigger Turbo
Turbo Inlet
MAP Sensor
Ethanol Set up
Header
External Wastegate
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Old 04-22-2021, 11:06 AM   #2
wobbletop
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Member#: 11652
Join Date: Oct 2001
Chapter/Region: E. Canada
Location: Ontario, Canada
Vehicle:
'18 Focus RS Red
'70 Porsche 914/6

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Quote:
Originally Posted by pugnaciouspete View Post
I don't have power goals, other than wanting to have some fun with the car.
Stock block. Remove pistons to check ring gaps. Have fun.
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Old 04-24-2021, 03:14 AM   #3
alexmartynyuk
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Member#: 191967
Join Date: Oct 2008
Location: Vancouver
Vehicle:
2005 EVO VIII
@boost_reality

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It appears that the new RA blocks are holding up pretty well. If you have no power goal in mind and want long term reliability thats probably your best optioni.
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Old 04-24-2021, 08:07 AM   #4
pcampbell
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Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

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I think a valid question is why did it blow up? If you put a new stock shortblock in and it blew up your last stock shortblock, what is it going to do to the new one?

IAG Stage 2.5 closed deck short block is way overkill for anything less than ~500whp I think.
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Old 04-24-2021, 11:37 AM   #5
Elbert Bass
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Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Vehicle:
2016 Fuji Sunfire 03
Silver

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Quote:
Originally Posted by pcampbell View Post
I think a valid question is why did it blow up? If you put a new stock shortblock in and it blew up your last stock shortblock, what is it going to do to the new one?

IAG Stage 2.5 closed deck short block is way overkill for anything less than ~500whp I think.
I'll take "What causes detonation and lean misfire on a tuned Subaru?"
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