Spun bearings survey?

GeoNV · 01-18-2021, 02:41 PM

Hey, I've heard lots of different reasons people spun bearings and lots of theories on how to prevent it- but I'm hoping people who've spun a bearing wouldn't mind doing a survey for me- if we get enough responses it would be pretty cool to see what common threads are there!

https://www.surveymonkey.com/r/JR2Z3DW

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BlackFighter · 01-18-2021, 03:37 PM

Looks like a great idea, I would also add if it was a stock block or built, was it forged internals? Maybe also add the company who put the block together?

GeoNV · 01-18-2021, 04:34 PM

I added some tick boxes at the last question to try to capture that- with a free survey I'm limited to 10 q's! people could put it in the comments i think. Thanks for the feedback.

GeoNV · 01-18-2021, 04:57 PM

Results here: https://www.surveymonkey.com/results/SM-SJ9KSJS57/

Jay11STI · 01-18-2021, 10:26 PM

Good idea but nothing is concreate. I do have a couple of suggestions. You might want to add 5w-40 oil since that is very popular. Also maybe change the engine mod section. Stage 1, 2, and 3 and reduce alot of those other options. The power levels for example can go.

There are SO many reasons why an engine can fail and so many possibilities as to why and how a spun bearing occures.

GeoNV · 01-19-2021, 12:37 PM

made some changes- I wanted to leave the power levels in there so if people know them they can put them in. I did add stages though, thanks for the suggestions.

Fairchild72 · 01-21-2021, 01:37 PM

As I am unsure of what the stock oil pump is I believe its 11? Ultimately the cause of my issue was determined to be a failed weld at the oil pick up!

GeoNV · 01-21-2021, 03:53 PM

ouch. that sounds pretty common out there. I think they were 10mm, then 11mm for the Sti from 08 on and even 12 mm for some JDM engines.

saaiello21 · 01-22-2021, 04:27 PM

Spun a bearing on my 11 WRX drag racing on a very hot day and about 2700 miles in on my oil change rotella 5w40. I blame the oil and maybe some detonation.

GK1707 · 01-22-2021, 05:08 PM

This is great data collection. So far I gathered that majority of bearing failure from those who answered have occurred in those that run 5w30 and a stock oil pickup

Jedi03 · 01-22-2021, 06:49 PM

based on my own reading over the years i think the stock pickup is a big culprit...to date im doing 5w30 with killer b oil system...so far so good! built motor will be adding larger oil pump as my clearances seem to be on the loose side when i build

Rallyquest · 01-23-2021, 02:54 PM

Quote:

Originally Posted by Jedi03

based on my own reading over the years i think the stock pickup is a big culprit...to date im doing 5w30 with killer b oil system...so far so good! built motor will be adding larger oil pump as my clearances seem to be on the loose side when i build

I recently purchased a mildly modded '08 STi, pretty much mint runs great, no weird internal noises. Ordered a Moroso pickup tube after reading many cooked engine posts on lots of sites, and a very high percentage of them include a cracked or failed oil tube. For the cost it looks like a must-do. I'm not even going to drive mine any further until it arrives and installed. I'm guessing the brazing process re-tempers the metal tube, and that combined with unsupported free end of the pickup tube vibrating does the damage over time as seen by where many are cracked.

Surely not the only reason the engines fail, but looks quite common.

Ryanearly · 01-25-2021, 08:31 PM

That was a pretty good survey. Is there a way to view the results?

GeoNV · 01-25-2021, 11:21 PM

Quote:

Originally Posted by Ryanearly

That was a pretty good survey. Is there a way to view the results?

Comment #4 should take you to the results Thanks for taking it!

idntvpe · 02-01-2021, 09:46 PM

Quote:

Originally Posted by GeoNV

Results here: https://www.surveymonkey.com/results/SM-SJ9KSJS57/

Great information. Its hard to believe only 1 had an AOS. 6 had DIY tunes. I would get the best tune I can get or wait until I can afford it before buying any other mods.
Good to see they were all above 60k though. Seems cumulative damage could be a factor.
Thanks for the post.

GeoNV · 02-02-2021, 02:24 PM

It is interesting isn't it? I wonder how that will look as more results come in.

01-18-2021, 02:41 PM	#1
GeoNV Scooby Newbie Member#: 518830 Join Date: Sep 2020 Chapter/Region: RMIC Location: Colorado Vehicle: 2009 WRX dark grey metallic	Spun bearings survey? Hey, I've heard lots of different reasons people spun bearings and lots of theories on how to prevent it- but I'm hoping people who've spun a bearing wouldn't mind doing a survey for me- if we get enough responses it would be pretty cool to see what common threads are there! https://www.surveymonkey.com/r/JR2Z3DW * Registered users of the site do not see these ads.

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01-18-2021, 03:37 PM	#2
BlackFighter Scooby Specialist Member#: 193940 Join Date: Nov 2008 Location: Philly Vehicle: 2004 WRX STI Black RalliSpec Shortblock	Looks like a great idea, I would also add if it was a stock block or built, was it forged internals? Maybe also add the company who put the block together?

01-18-2021, 04:34 PM	#3
GeoNV Scooby Newbie Member#: 518830 Join Date: Sep 2020 Chapter/Region: RMIC Location: Colorado Vehicle: 2009 WRX dark grey metallic	I added some tick boxes at the last question to try to capture that- with a free survey I'm limited to 10 q's! people could put it in the comments i think. Thanks for the feedback.

01-18-2021, 04:57 PM	#4
GeoNV Scooby Newbie Member#: 518830 Join Date: Sep 2020 Chapter/Region: RMIC Location: Colorado Vehicle: 2009 WRX dark grey metallic	Results here: https://www.surveymonkey.com/results/SM-SJ9KSJS57/

01-18-2021, 10:26 PM	#5
Jay11STI Scooby Newbie Member#: 492422 Join Date: Oct 2018 Chapter/Region: Tri-State Location: North Jersey Vehicle: 2011 STI	Good idea but nothing is concreate. I do have a couple of suggestions. You might want to add 5w-40 oil since that is very popular. Also maybe change the engine mod section. Stage 1, 2, and 3 and reduce alot of those other options. The power levels for example can go. There are SO many reasons why an engine can fail and so many possibilities as to why and how a spun bearing occures.

01-19-2021, 12:37 PM	#6
GeoNV Scooby Newbie Member#: 518830 Join Date: Sep 2020 Chapter/Region: RMIC Location: Colorado Vehicle: 2009 WRX dark grey metallic	made some changes- I wanted to leave the power levels in there so if people know them they can put them in. I did add stages though, thanks for the suggestions.

01-21-2021, 01:37 PM	#7
Fairchild72 Scooby Newbie Member#: 521505 Join Date: Jan 2021 Location: Edmonton, AB, CAN Vehicle: 2005 Forester White	As I am unsure of what the stock oil pump is I believe its 11? Ultimately the cause of my issue was determined to be a failed weld at the oil pick up!

01-21-2021, 03:53 PM	#8
GeoNV Scooby Newbie Member#: 518830 Join Date: Sep 2020 Chapter/Region: RMIC Location: Colorado Vehicle: 2009 WRX dark grey metallic	ouch. that sounds pretty common out there. I think they were 10mm, then 11mm for the Sti from 08 on and even 12 mm for some JDM engines.

01-22-2021, 04:27 PM	#9
saaiello21 Scooby Newbie Member#: 501997 Join Date: May 2019 Chapter/Region: Tri-State Location: Atglen PA Vehicle: 2011 WRX gray	Spun a bearing on my 11 WRX drag racing on a very hot day and about 2700 miles in on my oil change rotella 5w40. I blame the oil and maybe some detonation.

01-22-2021, 05:08 PM	#10
GK1707 Scooby Specialist Member#: 373868 Join Date: Nov 2013 Chapter/Region: Tri-State Location: Queens, NY Vehicle: '04 STi WRB	This is great data collection. So far I gathered that majority of bearing failure from those who answered have occurred in those that run 5w30 and a stock oil pickup

01-22-2021, 06:49 PM	#11
Jedi03 Scooby Specialist Member#: 491095 Join Date: Sep 2018 Chapter/Region: SWIC Location: New Mexico Vehicle: 2009 STi Blue Blue	based on my own reading over the years i think the stock pickup is a big culprit...to date im doing 5w30 with killer b oil system...so far so good! built motor will be adding larger oil pump as my clearances seem to be on the loose side when i build

01-25-2021, 08:31 PM	#13
Ryanearly Scooby Newbie Member#: 514627 Join Date: May 2020 Location: Wales, MA	That was a pretty good survey. Is there a way to view the results?

02-02-2021, 02:24 PM	#16
GeoNV Scooby Newbie Member#: 518830 Join Date: Sep 2020 Chapter/Region: RMIC Location: Colorado Vehicle: 2009 WRX dark grey metallic	It is interesting isn't it? I wonder how that will look as more results come in.