Welcome to the North American Subaru Impreza Owners Club Saturday July 4, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 08-01-2014, 11:54 PM   #26
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Fixed all of the leaks with copper spray-a-gasket & permatex exhaust sealer. Idle noise isn't as quiet as I was expecting without leaks, still a lot of ticking underneath the car, but it definitely sounds a little different now.

BUT... I still get that awful rumbling/buzzing pedal vibration & noise when I rev the engine, clutch in or out. Right around 4k RPM it's impossible to miss and it's new within the last 3-4 months. I'm trying to think of something that could be either out of balance or having too much free-play to cause such a sharp vibration & noise.

Is it possible the flywheel & clutch housing are getting out of balance? It does slip sometimes.

Next step is a Blackstone sample next month. Even if that comes back squeaky clean though, their could still be bearing wear, it just would have happened a few oil changes ago, right? The only thing that makes sense to me is that slight knock (only suspected due to -1.5 FLKC here and there in my tune), and maybe even screwing around in the snow, wore my bearings down by like half a millimeter, and then stopped, so they're's just a little bit of play in them now?
* Registered users of the site do not see these ads.

Last edited by blehhh; 08-02-2014 at 12:04 AM.
blehhh is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 08-02-2014, 07:36 AM   #27
bicycle_wreck
Scooby Specialist
 
Member#: 226331
Join Date: Oct 2009
Chapter/Region: South East
Location: Knoxville, TN
Vehicle:
2012 WRX Hatch
Dirty Smurf

Default

Your bearing wear wouldn't stop once there was enough material gone for them to have play/knock. They would continue eating themselves, which would show up in a Used Oil Analysis.

What kind of oil are you running and how often is it changed?
bicycle_wreck is offline   Reply With Quote
Old 08-02-2014, 10:48 AM   #28
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Rotella T6, every 3k.

I should mention, I don't seem to hear any or feel any of these noises & vibrations while I'm actually driving it. It may just be masked by road noise, but if not, could this maybe point toward the clutch/flywheel? i.e. it only free to buzz about when there isn't actual load on the components?

Update: Looks like the sealant is already starting to flake off in spots. Hopefully it stays put between the flanges.

Here's a quick video I just took. Again, it doesn't sound a single spun bearing, but it sounds like what I imagine 4 slightly worn rod bearings would sound like.

https://www.youtube.com/watch?v=sfT3nKY6E7w

Last edited by blehhh; 08-02-2014 at 04:37 PM.
blehhh is offline   Reply With Quote
Old 08-06-2014, 12:02 PM   #29
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: MWSOC
Location: Nebraska
Vehicle:
2005 STi - E85
2004 S2000 - E85

Default

I kinda laughed when I started reading this and you were looking to replace an entire motor that runs well for suspected damage to all rod bearings with no real indication of bearing issues.

With that said, have you checked all your motor/trans mounts? Have you removed the bottom flywheel cover and inspect all the pressure plate straps?
yamahaSHO is offline   Reply With Quote
Old 08-06-2014, 11:21 PM   #30
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by yamahaSHO View Post
I kinda laughed when I started reading this and you were looking to replace an entire motor that runs well for suspected damage to all rod bearings with no real indication of bearing issues.

With that said, have you checked all your motor/trans mounts? Have you removed the bottom flywheel cover and inspect all the pressure plate straps?
I know, I sound like a total automotive hypochondriac, but watch the videos! They sound awful.

https://www.youtube.com/watch?v=sfT3nKY6E7w

Something is seriously wrong, but I can't seem to get anyone who looks at it to be concerned about it.

Motor and trans mounts are good.

I haven't inspected the pressure plate itself, but I had the dealership inspect the clutch overall back in May when I noticed it was having trouble holding the torque sometimes. They said the clutch looked perfectly fine, not even clutch dust in the casing. Said I must be driving the car too aggressively / too much power for the stock clutch to handle.

I would love for it to just be something with the clutch/flywheel assembly, but no one I bring it to wants to do anything about it.
blehhh is offline   Reply With Quote
Old 08-07-2014, 12:08 AM   #31
scoobySTi06
Scooby Newbie
 
Member#: 334064
Join Date: Oct 2012
Default

Have you looked into Element Tuning? There shortblocks are in your price range. Shoot Phil an email. You wont regret it.
scoobySTi06 is offline   Reply With Quote
Old 08-07-2014, 11:47 AM   #32
Element Tuning
Former Vendor
 
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
Vehicle:
673 WHP Element
Tuning Pro Comp Engine

Default

Damn, my ears must be burning! Thought I heard someone calling my name

So before you jump off the deep end and into an engine build that may not actually be warranted, I suggest you remove your oil filter, cut it apart, and see if you can find any bearing material that may have been entrapped in the filter. Also check your oil to see if it looks metallic when it's drained. You should drain it through a white t-shirt or some sort of cloth.

Another thing you should do is hook up an oil pressure gauge and see what your oil pressure is doing - that will give you some insight.

Now, if you find no evidence of bearing material, then you should keep looking at other possibilities. Be SMART when you're checking. Start small and work your way up - don't always jump to the worst-case-scenario assumption. It appears you've done quite a bit already.

If you do find engine damage and bearing material in your oil, then yes, I suggest you go ahead and shoot me an email or give me a call so we can talk a little more in depth concerning your options.

-Andrew
Element Tuning
www.elementtuning.com

Element Tuning is offline   Reply With Quote
Old 08-07-2014, 11:58 AM   #33
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: MWSOC
Location: Nebraska
Vehicle:
2005 STi - E85
2004 S2000 - E85

Default

Oil pressure would be a good idea... You could have a pickup tube failing.
yamahaSHO is offline   Reply With Quote
Old 08-07-2014, 12:37 PM   #34
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

False alarm, fellas! Found the source of my "rod knock"







Gosh I feel stupid. How did I miss this?! phew!

(Someone on Club WRX knew exactly what it was when I said "I can feel it through the gas pedal")
blehhh is offline   Reply With Quote
Old 08-07-2014, 12:46 PM   #35
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

(whoops)
blehhh is offline   Reply With Quote
Old 08-07-2014, 01:04 PM   #36
Element Tuning
Former Vendor
 
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
Vehicle:
673 WHP Element
Tuning Pro Comp Engine

Default

A day without a blown engine is always a good one

Glad you were able to source your issue. Like I said - never jump to worse case scenario

-Andrew
Element Tuning
www.elementtuning.com
Element Tuning is offline   Reply With Quote
Old 08-07-2014, 01:06 PM   #37
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: MWSOC
Location: Nebraska
Vehicle:
2005 STi - E85
2004 S2000 - E85

Default

I can't see the pictures at work... What was it?
yamahaSHO is offline   Reply With Quote
Old 08-07-2014, 01:13 PM   #38
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by yamahaSHO View Post
I can't see the pictures at work... What was it?
Intercooler bracket was hammering into the brake fluid reservoir, to the point of almost rupturing it.

This is explains everything though, like why it got worse over time, why it started a few months ago (fixed an intercooler leak), why my steering wheel vibrates a little, why the stock pitch stop made it worse, why I could only really hear it from inside and while the windows were rolled up, why it didn't really do it much under load, etc.
blehhh is offline   Reply With Quote
Old 08-07-2014, 04:03 PM   #39
bicycle_wreck
Scooby Specialist
 
Member#: 226331
Join Date: Oct 2009
Chapter/Region: South East
Location: Knoxville, TN
Vehicle:
2012 WRX Hatch
Dirty Smurf

Default

I'll bet your FBKC will go down as well.
bicycle_wreck is offline   Reply With Quote
Old 08-07-2014, 04:26 PM   #40
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by bicycle_wreck View Post
I'll bet your FBKC will go down as well.
Exactly what I'm hoping for too, because it always coincided with that pedal kicking I'd feel at low RPM.

UPDATE: I spoke too soon... the pedal vibrations are gone, but the noise remains. Something somewhere is still making a deep buzzing/knocking sound.

Last edited by blehhh; 08-07-2014 at 07:10 PM.
blehhh is offline   Reply With Quote
Old 10-23-2014, 09:13 PM   #41
JimmyBoyWRX
Scooby Specialist
 
Member#: 371081
Join Date: Oct 2013
Chapter/Region: NESIC
Location: CT
Vehicle:
2013 WRX Limited
2006 WRX

Default

Quote:
Originally Posted by blehhh View Post

Exactly what I'm hoping for too, because it always coincided with that pedal kicking I'd feel at low RPM.

UPDATE: I spoke too soon... the pedal vibrations are gone, but the noise remains. Something somewhere is still making a deep buzzing/knocking sound.
Any update?
JimmyBoyWRX is offline   Reply With Quote
Old 10-24-2014, 10:09 AM   #42
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by JimmyBoyWRX View Post
Any update?
It's something in the transmission. When I rev the engine and it makes the buzzing noise, I can grab the shifter and make it stop. The linkage isn't what's buzzing though, it's something inside the transmission.

I bought a new header to eliminate the leaks, and that got rid of some of the scary noises, but there's still the transmission rumble (not whine), and the engine does sound a little thumpy at idle (thump-thump-thump-thump). I'm going to keep it through the winter at the least, and see if it holds up.

I really wish the thing were smoother & quieter like it was when it was new, without so much rumbling/buzzing, but it just isn't anymore.
blehhh is offline   Reply With Quote
Old 10-24-2014, 02:05 PM   #43
1wrxtra
Scooby Specialist
 
Member#: 316364
Join Date: Apr 2012
Chapter/Region: MAIC
Vehicle:
2012 WRX

Default

When was the last time you changed the trans fluid?


Sent from my iPhone using NASIOC
1wrxtra is offline   Reply With Quote
Old 10-24-2014, 02:07 PM   #44
blehhh
Scooby Specialist
 
Member#: 316517
Join Date: Apr 2012
Chapter/Region: NESIC
Location: Portland, ME
Vehicle:
2012 WRB WRX Hatch
TP Stage III & ELH

Default

Quote:
Originally Posted by 1wrxtra View Post
When was the last time you changed the trans fluid?


Sent from my iPhone using NASIOC
Never been changed. Only 28k on the car. I asked for the dealership to do it when I brought the car in for a early 30k service, and then they told me after the fact that they didn't change it because it's only required at 60k. I asked you to do it and paid you assuming you were. wtf.
blehhh is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 04:32 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2015, North American Subaru Impreza Owners Club, Inc.