Welcome to the North American Subaru Impreza Owners Club Tuesday April 21, 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 > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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 02-01-2005, 08:09 PM   #1
one wicked wrx
Scooby Newbie
 
Member#: 27017
Join Date: Oct 2002
Chapter/Region: Tri-State
Location: NYC
Vehicle:
07 WRX

Default sti piston ring spec

Does Anyone Have The Specs For The Gapping Of The Rings From Subaru Maybe From The Service Book?
* Registered users of the site do not see these ads.
one wicked wrx is offline   Reply With Quote
Old 02-02-2005, 09:33 AM   #2
bikerboy
Scooby Specialist
 
Member#: 5477
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: in the garage!
Vehicle:
2007 R171.473
2009 SWP Spec B

Default

.20-.25mm top ring
.37-.52mm second ring
.20-.50mm oil ring
bikerboy is offline   Reply With Quote
Old 02-02-2005, 11:44 AM   #3
one wicked wrx
Scooby Newbie
 
Member#: 27017
Join Date: Oct 2002
Chapter/Region: Tri-State
Location: NYC
Vehicle:
07 WRX

Default

this is what subaru calls to use?
one wicked wrx is offline   Reply With Quote
Old 02-02-2005, 11:48 AM   #4
bikerboy
Scooby Specialist
 
Member#: 5477
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: in the garage!
Vehicle:
2007 R171.473
2009 SWP Spec B

Default

directly from the manuel
bikerboy is offline   Reply With Quote
Old 02-02-2005, 12:05 PM   #5
one wicked wrx
Scooby Newbie
 
Member#: 27017
Join Date: Oct 2002
Chapter/Region: Tri-State
Location: NYC
Vehicle:
07 WRX

Default

thanks for the help
one wicked wrx is offline   Reply With Quote
Old 02-02-2005, 01:06 PM   #6
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default

Quote:
Originally Posted by bikerboy
.20-.25mm top ring
.37-.52mm second ring
.20-.50mm oil ring
too tight
too tight
too tight

for making power and keeping your ring lands intact...my opinion, of course
n2xlr8n is offline   Reply With Quote
Old 02-02-2005, 01:09 PM   #7
one wicked wrx
Scooby Newbie
 
Member#: 27017
Join Date: Oct 2002
Chapter/Region: Tri-State
Location: NYC
Vehicle:
07 WRX

Default

wha would u suggest
one wicked wrx is offline   Reply With Quote
Old 02-02-2005, 01:15 PM   #8
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default

Quote:
Originally Posted by one wicked wrx
wha would u suggest
Using Speed Pro / C&A / Manley / CP's tried and true method of gapping for application and bore size....it's online, I'd be apprehensive about quoting it to you off the top of my head.
n2xlr8n is offline   Reply With Quote
Old 02-02-2005, 03:09 PM   #9
bikerboy
Scooby Specialist
 
Member#: 5477
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: in the garage!
Vehicle:
2007 R171.473
2009 SWP Spec B

Default

What he asked was:

Quote:
Does Anyone Have The Specs For The Gapping Of The Rings From Subaru Maybe From The Service Book?
What I gave him is directly from the manuel.


What n2xlr8n is quoting is the standard .004in per 1" of bore formula used. So if we do the math with this we get:

99.5mm bore = 3.917in

3.917x.004=.015668in

.20-.25mm/.0079-.0098in top ring
.37-.52mm/.015-.020in second ring
.20-.50mm/.0079-.0098in oil ring

So the second ring is not to tight if you go by what he is saying. In my experience building 14k redline engines with smaller bores is to not go by Chevy specs.

Last edited by bikerboy; 02-02-2005 at 03:36 PM.
bikerboy is offline   Reply With Quote
Old 02-02-2005, 06:11 PM   #10
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default

Quote:
Originally Posted by bikerboy
What he asked was:



What I gave him is directly from the manuel.


What n2xlr8n is quoting is the standard .004in per 1" of bore formula used. So if we do the math with this we get:

99.5mm bore = 3.917in

3.917x.004=.015668in

.20-.25mm/.0079-.0098in top ring
.37-.52mm/.015-.020in second ring
.20-.50mm/.0079-.0098in oil ring

So the second ring is not to tight if you go by what he is saying. In my experience building 14k redline engines with smaller bores is to not go by Chevy specs.
Pardon me; I may have touched a nerve.

I wasn't criticizing what you were providing, only providing input into his choice of gap......and if you've built engines, you'd know the "formula" has nothing to do with Chevrolet per se, but with ring type, bore size and application. I do not particularly care what you think of my opinion, but if you're so sensitive, I'd suggest trying another forum.

What kind of 14k redline engines have you built? Motorcycles? Are you and Ron @ Axis buddies? Aren't you the guy that stated the STi cylinders were nikasil? I thought so.


Steve
n2xlr8n is offline   Reply With Quote
Old 02-02-2005, 07:47 PM   #11
bikerboy
Scooby Specialist
 
Member#: 5477
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: in the garage!
Vehicle:
2007 R171.473
2009 SWP Spec B

Default

Quote:
Originally Posted by n2xlr8n
Pardon me; I may have touched a nerve.

I wasn't criticizing what you were providing, only providing input into his choice of gap......and if you've built engines, you'd know the "formula" has nothing to do with Chevrolet per se, but with ring type, bore size and application. I do not particularly care what you think of my opinion, but if you're so sensitive, I'd suggest trying another forum.

What kind of 14k redline engines have you built? Motorcycles? Are you and Ron @ Axis buddies? Aren't you the guy that stated the STi cylinders were nikasil? I thought so.


Steve


WOW, I guess I didnt think I was trying to fire back at you with this. I was pointing out that he asked for specs from the manuel I gave them to him .
Then you said they were all to tight quoting no factual data but just look it up "it's online" and I disagreed with you because all he is going to easily find is the 4:1 type of spec. Which you stated was to tight even in the stock specs which was incorrect as the math shows.

Yes, motorcycles which use much of the same tech.

And they are not Nicasil? What are they then? I dont know where you are getting this but what contects was it used?

As with the rest of your little flame fest here, I see you are representing what the core of NASIOC hates slamming people who are not even involved with this? I shared a couple of emails with Ron but they were concerning cams that he is working on for the STI. What the hell does he have to do with this?

Take a pill and relax Sally
bikerboy is offline   Reply With Quote
Old 02-03-2005, 02:58 PM   #12
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default

Quote:
Originally Posted by bikerboy
1) WOW, I guess I didnt think I was trying to fire back at you with this. I was pointing out that he asked for specs from the manuel I gave them to him
2) Then you said they were all to tight quoting no factual data but just look it up "it's online" and I disagreed with you because all he is going to easily find is the 4:1 type of spec. Which you stated was to tight even in the stock specs which was incorrect as the math shows.

Yes, motorcycles which use much of the same tech.

3) And they are not Nicasil? What are they then? I dont know where you are getting this but what contects was it used?

4) As with the rest of your little flame fest here, I see you are representing what the core of NASIOC hates slamming people who are not even involved with this? I shared a couple of emails with Ron but they were concerning cams that he is working on for the STI. What the hell does he have to do with this?

Take a pill and relax Sally

1&2) No argument here. I was offering an educated opinion; non-factual? Hardly. Ask any reputable engine builder if he'd run .009-.0015" on the top ring on a forced induction application with a bore of that size. If he says yes, stay away from him. Math? When's the last time you've seen a linear regression make a 8.80 1/4 mile pass?

3) I can't think of any passenger car application that has ever used nikasil liners; You stated it, not I. They are <gasp> cast iron.

4) Call it a flame fest if you will, I was simply offering an opinion, at which point you chime in like you had something to defend, which you didn't. Your data that you provided to the member was factual, I was not attacking it. My poke at Ron was just that...a poke. He knows I think he's full of dung.

I'll take one of your pills, Wilma

Sincerely, have a nice day, and thanks for your input to the community.
n2xlr8n is offline   Reply With Quote
Old 02-03-2005, 03:55 PM   #13
bikerboy
Scooby Specialist
 
Member#: 5477
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: in the garage!
Vehicle:
2007 R171.473
2009 SWP Spec B

Default

bikerboy is offline   Reply With Quote
Old 02-03-2005, 08:34 PM   #14
dwx
Scooby Guru
 
Member#: 8343
Join Date: Jul 2001
Chapter/Region: MWSOC
Location: Atlanta, GA
Vehicle:
2005 2012 Jeep
2013 DGM BRZ

Default

There are high performance cars that have used Nikasil coatings in the past. The Carrera GT uses Nikasil with its aluminum block. The Lotus Espirit also does.


n2xlrn I think you took whatever bikerboy was saying a little too personally somehow and turned this thread into garbage... personal insults aren't helpful to anyone.
dwx is offline   Reply With Quote
Old 02-14-2005, 06:27 PM   #15
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default

Quote:
Originally Posted by dwx
n2xlrn I think you took whatever bikerboy was saying a little too personally somehow and turned this thread into garbage... personal insults aren't helpful to anyone.

Okay. I think I have run afoul of the nasioc buddy-club.

I did not take it personally, fwiw. If bikerboy wants to use the .004" per inch of bore on his Subaru, go right ahead. Be sure and report back how it turned out.

edited for proper english context...old english, of course...I'm not an Ivy Leaguer

Last edited by n2xlr8n; 02-15-2005 at 05:39 PM.
n2xlr8n is offline   Reply With Quote
Old 02-15-2005, 05:38 PM   #16
n2xlr8n
Scooby Specialist
 
Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
It lives! ; )

Default

double idiot
n2xlr8n 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
FS: AZ: Brand spankin NEW STi Pistons/Rings/Wrist Pins szeny Engine/Power/Exhaust 14 08-22-2007 02:22 PM
WTB: used avc-r, new or used perrin fuel rails, oem sti piston ring set blowbyu24 Private 'Wanted' Classifieds 1 01-26-2007 10:25 AM
Anyone know OEM 2.5 sti piston ring thickness? bugeyes Built Motor Discussion 4 06-30-2006 11:14 AM
FS: 06 sti pistons rings rods and pins 4goodtime Private 'For Sale' Classifieds 1 03-06-2006 10:10 AM
is OEM STI piston rings strong enough?? skyline31 Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 2 01-15-2005 11:17 AM


All times are GMT -4. The time now is 02:23 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.