Welcome to the North American Subaru Impreza Owners Club Wednesday July 29, 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 04-25-2006, 12:43 AM   #1
typeRsti
Scooby Newbie
 
Member#: 111748
Join Date: Apr 2006
Default Does this look like detonation? my #2 rod bearing has been hammered to peices

hi guys, recently stripped my 97 sti engine due to a big knocking sound, i had purposely bought the car cheap knowing it had a knocking bearing, im a mechanic in new zealand and have done plenty of engine rebuilds but none on a subaru .So since i have owned a few wanted to have a crack.. anyway, once stripped i noticed the #2 connecting rod was as loose as a whore and there was basicly nothing left but hammered bearings and a scored crank.. im assuming that because the previous owner had fitted a full 3 inch exhaust and a blitz cone filter and had left the air temp sensor dangling in the engine bay that the car had leaned out and cause detonation on that cylinder.. Just after any other thoughts on this as i would hate to rebuild and have the same thing happen again, im thinking an injector clean and flow and return to the old airbox would be a start( obviously i have to rebuild the engine first) and once done a run on my local awd dyno

cheers

i have some pics of the #2 piston which has some odd carbonless spots on it.. how do i upload pictures?
* Registered users of the site do not see these ads.
typeRsti is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 04-25-2006, 08:50 AM   #2
jigga
Scooby Guru
 
Member#: 9960
Join Date: Sep 2001
Location: in bed...
Vehicle:
2002 Impreza WRX
WRBlue Perl

Default

you need to host them on photobucket or similar... You also need to have a certain number of posts before you can put pics up...
jigga is offline   Reply With Quote
Old 04-25-2006, 02:12 PM   #3
bboy
Scooby Specialist
 
Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
04 Improved STI
Dirty White

Default

That set up plus a stealthy manual boost controller and no tuning would end in lots of det. What's your question?

You need to tune and everything will be fine.
bboy is offline   Reply With Quote
Old 04-28-2006, 03:51 AM   #4
typeRsti
Scooby Newbie
 
Member#: 111748
Join Date: Apr 2006
Default

yeah.. i didnt own the car when the damage was done... thought detonation from these mods would cause it... you just backed up what i thought

cheers
typeRsti is offline   Reply With Quote
Old 04-28-2006, 10:38 AM   #5
Scoobie Steve
Scooby Specialist
 
Member#: 2289
Join Date: Sep 2000
Chapter/Region: Tri-State
Location: Bangor, PA
Vehicle:
1998 11.87@112mph
Subaru L Ver 6 STi Type R

Default

Quote:
Originally Posted by typeRsti
i have some pics of the #2 piston which has some odd carbonless spots on it.. how do i upload pictures?
That makes me think maybe the head gasket was on its way out. Also when rod bearings go it allows the piston to hit the head and sometimes it bends valves, That could explain the carbonless spots
Scoobie Steve is offline   Reply With Quote
Old 05-02-2006, 05:12 AM   #6
typeRsti
Scooby Newbie
 
Member#: 111748
Join Date: Apr 2006
Default

that makes complete sense, was thinking the carbonless spots look very symmetrical like valve marks, but theres no indentations in the pistons.. recon those old factory sti pistons are alot stronger than i thought, no doubt once i strip the head the valves might be a tad bent... hope not though!


cheers for the input
typeRsti 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Does this look like a Warhol to you? Kha0S Off-Topic 15 02-02-2006 05:20 AM
does this look like a scam to you guys? Depeche Off-Topic 6 11-16-2005 10:20 AM
uhm.. What does this look like to you? *lmao* Sauceboy01 Off-Topic 19 07-09-2004 01:40 AM


All times are GMT -4. The time now is 01:13 AM.


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.