Welcome to the North American Subaru Impreza Owners Club Monday December 22, 2014
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 08-09-2007, 08:27 PM   #1
Starkiller
Scooby Specialist
 
Member#: 82741
Join Date: Mar 2005
Chapter/Region: NESIC
Location: Bristol, CT
Vehicle:
2002 WRX WRB
2007 350Z Silver

Default Silly but serious question

Can an OEM piston w/broken ringland be replaced with an identical(ie replace an A piston with another A piston) good piston, keep the old rings and not have to re-hone the block assuming there was no scoring/damage on cylinder bores?


FSM states only to bore/hone if out-of-roundness, taper or cylinder to piston clearance exceeds tolerance.
* Registered users of the site do not see these ads.
Starkiller is offline   Reply With Quote
Old 08-09-2007, 10:20 PM   #2
LiquidForce
Scooby Specialist
 
Member#: 12811
Join Date: Nov 2001
Chapter/Region: South East
Location: Roswell Ga
Vehicle:
2002 2.5l Wrx
517whp/516wtq (Stage pi)

Default

I picked up 4 new stock pistons from one of our better known engine builders for $50 shipped. Rings were another 120 ( have to buy a set of 4) . The cylinder was in excellent shape so I just replaced the one that was bad. About 6 months later another one went so I decided it was time to go with better pistons.

I was pushing 400whp which I believe to be the limit of the stock sti pistons in a high compression (9:1) hybrid setup. If your power is near the limit of the pistons I would recommend upgrading so you don't go through what I did.
LiquidForce is offline   Reply With Quote
Old 08-09-2007, 11:13 PM   #3
gto7419
Scooby Specialist
 
Member#: 44256
Join Date: Sep 2003
Chapter/Region: Tri-State
Location: Long Island, NY
Vehicle:
2002 WRX Wagon

Default

I would not reuse old rings, and from what I have read, you dont need to rehone a cylinder if a good crosshatching pattern is still there.

You should be ok with only replacing the one bad piston....

Also, pistons are designated not only an "a" "b" or "c", but also a "l" or "r" for left and right....
gto7419 is offline   Reply With Quote
Old 08-10-2007, 12:39 AM   #4
modaddict
Scooby Guru
 
Member#: 95840
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Pasco, WA
Vehicle:
sold to a good bud
awaiting next car

Default

do it, and let us know what happens!
modaddict is offline   Reply With Quote
Old 08-10-2007, 12:49 AM   #5
reddevil
Scooby Guru
 
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default

While its not obviously recommended, I can see why you would want to do this from a monentary standpoint. And while you may get some unwanted blowyby it should be minimal.
reddevil 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
Morbid but serious question. tess Off-Topic 37 06-22-2007 02:39 PM
Okay it's silly, but i got rocket launcher envy from an earlier post... mshibata Baja Forum 3 05-07-2005 12:52 AM
Silly But.... How do you post PIX's TOMMY B Newbies & FAQs 5 11-20-2001 11:15 PM
Silly but handy trunk hook mod Peaty Interior & Exterior Modification 17 07-23-2001 11:48 PM


All times are GMT -4. The time now is 08:05 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.