Welcome to the North American Subaru Impreza Owners Club Monday January 20, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 02-03-2014, 05:58 PM   #26
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

Anyone in this thread installed a set of these yet? If so, what are you gapping the rings at. I just bought a set and gapped the rings using their sheet (Medium boost 15-30lb = .022-.024") and have not installed the pistons yet.

I question this because they are Total Seal rings that come with them and Total Seal's website for the same application (Medium boost 15-30lb) is Bore x .007" which brings it to .027".
* Registered users of the site do not see these ads.

Last edited by yamahaSHO; 02-03-2014 at 06:05 PM.
yamahaSHO is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 02-03-2014, 09:52 PM   #27
boostkreeep
Scooby Newbie
 
Member#: 209880
Join Date: Apr 2009
Location: Knoxville,TN
Vehicle:
2006 STI
white

Default

I have installed them I gapped mine to .024 per the instruction for the top two rings. I havent had any problems
boostkreeep is offline   Reply With Quote
Old 02-03-2014, 10:09 PM   #28
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

I have mine gapped at .022" per the instructions. I cross-referenced Total Seal's page and by their math, they say it should be .027". Just curious. If it's working, it's working.
yamahaSHO is offline   Reply With Quote
Old 02-03-2014, 10:18 PM   #29
boostkreeep
Scooby Newbie
 
Member#: 209880
Join Date: Apr 2009
Location: Knoxville,TN
Vehicle:
2006 STI
white

Default

Yeah I would say its working, have about 3700 miles on the motor no oil consumption that I notice. Just got off the dyno this weekend and made 400 whp.
boostkreeep is offline   Reply With Quote
Old 02-03-2014, 10:22 PM   #30
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

Nice, what turbo? I just posted my pre-forged piston motor in the "power bragging" section. I am going to try to keep the power where it currently is.
yamahaSHO is offline   Reply With Quote
Old 02-04-2014, 10:40 AM   #31
daslog
Scooby Newbie
 
Member#: 314410
Join Date: Mar 2012
Chapter/Region: NESIC
Location: Milford NH
Vehicle:
2004 WRX
Black

Default

Does anyone know why ring gap is set by boost levels? I've never heard of that before and I'm very curious about the engineering behind it.
daslog is offline   Reply With Quote
Old 02-04-2014, 11:20 AM   #32
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

They are probably assuming the more boost you run, the more power/heat you will create. More heat will bring those rind ends closer together.
yamahaSHO is offline   Reply With Quote
Old 02-04-2014, 11:53 AM   #33
Paul
Scooby Guru
 
Member#: 56203
Join Date: Feb 2004
Chapter/Region: Tri-State
Location: south nj
Vehicle:
00 RSTI Coupe
Twin Scroll 2.5XTR EJ207

Default

anyone measure PTW clearance with these?
Paul is offline   Reply With Quote
Old 02-04-2014, 12:03 PM   #34
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

I would if I had the tools to measure it, but all I have are some digital calipers that likely aren't long enough to get around the piston far enough to measure the barrel.
yamahaSHO is offline   Reply With Quote
Old 02-04-2014, 12:31 PM   #35
Paul
Scooby Guru
 
Member#: 56203
Join Date: Feb 2004
Chapter/Region: Tri-State
Location: south nj
Vehicle:
00 RSTI Coupe
Twin Scroll 2.5XTR EJ207

Default

you'd need a 3-4in mic and a decent bore gauge to check. I know they are made to be dropped into new blocks but I would still check just incase
Paul is offline   Reply With Quote
Old 02-04-2014, 12:54 PM   #36
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

I know what is needed to measure properly, however, I bought these so that I wouldn't need to do some of the additional work. After seeing how dirty the OEM block is put together from the factory, I don't think I'm making anything worse without measuring.
yamahaSHO is offline   Reply With Quote
Old 02-04-2014, 12:58 PM   #37
smoky
Scooby Newbie
 
Member#: 221439
Join Date: Aug 2009
Chapter/Region: E. Canada
Location: Quebec, Canada
Vehicle:
2004 STI
Blue

Default

Ship me a set and and a block and I'll measure them
smoky is offline   Reply With Quote
Old 02-04-2014, 01:00 PM   #38
smoky
Scooby Newbie
 
Member#: 221439
Join Date: Aug 2009
Chapter/Region: E. Canada
Location: Quebec, Canada
Vehicle:
2004 STI
Blue

Default

One thing to consider is that by dropping them in, you get the same result as a block that is bore without torque plate. Many people get good result without torque plate, not trying to restart the debate in the thread.
smoky is offline   Reply With Quote
Old 02-04-2014, 01:00 PM   #39
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

Sure, just pay for shipping. Factor in customs... $3500.
yamahaSHO is offline   Reply With Quote
Old 02-04-2014, 01:10 PM   #40
gamebred1
Scooby Newbie
 
Member#: 379450
Join Date: Jan 2014
Default

This might be a good option for me. I just got my brand new case BB/BB. I had planned to bring it down to the machine shop to have it measured but bad weather/work got in the way of that. I was gonna have either JE make custom pistons to bore, or the other way around. This has me interested though. Just received the Manley "H-tuff" rods yesterday. Thanks for posting, I'll be following this thread.
gamebred1 is offline   Reply With Quote
Old 02-04-2014, 01:30 PM   #41
daslog
Scooby Newbie
 
Member#: 314410
Join Date: Mar 2012
Chapter/Region: NESIC
Location: Milford NH
Vehicle:
2004 WRX
Black

Default

I'm doing a Hybrid build with these right now with a new Shortblock all B sized. I'll let you know how it goes
daslog is offline   Reply With Quote
Old 02-04-2014, 02:39 PM   #42
gamebred1
Scooby Newbie
 
Member#: 379450
Join Date: Jan 2014
Default

^^ Thanks. I look forward to the results. Good luck.
gamebred1 is offline   Reply With Quote
Old 02-04-2014, 05:19 PM   #43
reid-o
Scooby Specialist
 
Member#: 103631
Join Date: Dec 2005
Location: Mililani, Hawaii
Vehicle:
2004 STI
Gray

Default

Quote:
Originally Posted by smoky View Post
One thing to consider is that by dropping them in, you get the same result as a block that is bore without torque plate. Many people get good result without torque plate, not trying to restart the debate in the thread.
Crystals data suggests that it depends on the clamping force of the fasteners more distortion with more clamping force. I think it was negligible with stock fasteners and stock torque values.
reid-o is offline   Reply With Quote
Old 02-04-2014, 06:56 PM   #44
nomoreshanks
Scooby Newbie
 
Member#: 369799
Join Date: Oct 2013
Chapter/Region: TXIC
Location: Texas
Vehicle:
2010 997 Turbo
Carrera White

Default

I too am doing a build with these. New STi SB, BBBB. I have mics and a bore gauge so Ill take some measurements.
nomoreshanks is offline   Reply With Quote
Old 02-04-2014, 07:06 PM   #45
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

Everyone seems to be getting BBBB's. My buddy just put in a new block after spinning a bearing and got BBBB, which is what I was hoping for. I got ABAB.
yamahaSHO is offline   Reply With Quote
Old 02-16-2014, 09:03 PM   #46
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

Default

Working on my motor with these pistons right now. They look like they'll be noisy at startup. The forged pistons I put in my SHO fit much tighter.

I currently just have two pistons installed. Got someone coming over to help me position the block off the stand to take off the access covers for the rear pistons.





Checking the ring gap after some grinding and filing.


Using Total Seal Quick Seat for the walls/rings. It's a powder you rub in after cleaning the walls and putting a thin coat of WD-40 on. It will also turn black if the walls are not completely clean; green if clean (hard to see in the pic).


yamahaSHO is offline   Reply With Quote
Old 02-16-2014, 09:51 PM   #47
Layvon
Scooby Guru
 
Member#: 195711
Join Date: Nov 2008
Chapter/Region: MWSOC
Location: Lapeer MI
Vehicle:
PART OUT. PM ME
02-07 Goodies

Default

Wow great pictures man. I've never seen pictures taken on how to measure ring gap. Often wondered but never knew exactly how to do it.

So, thanks!

What do you have to get repositioned? Don't have a table you can set it on?
Layvon is online now   Reply With Quote
Old 02-16-2014, 10:19 PM   #48
ALOKIN
Scooby Specialist
 
Member#: 348177
Join Date: Feb 2013
Chapter/Region: TXIC
Location: TX
Vehicle:
2002 Bugeye
Haltech GTX3584RS

Default

Any idea what your PTW is?
ALOKIN is offline   Reply With Quote
Old 02-16-2014, 10:24 PM   #49
Layvon
Scooby Guru
 
Member#: 195711
Join Date: Nov 2008
Chapter/Region: MWSOC
Location: Lapeer MI
Vehicle:
PART OUT. PM ME
02-07 Goodies

Default

Someone said it a few posts back.

Edit. . . Didn't read your post for comprehension. They were aiming for this:

Quote:
Originally Posted by Crystal_Imprezav View Post
They are 2618. I haven't handled a set in person but I am sure they are aimed at a .003-.0035 PTW based on the corresponding sizes.

Last edited by Layvon; 02-16-2014 at 10:40 PM.
Layvon is online now   Reply With Quote
Old 02-16-2014, 10:42 PM   #50
ALOKIN
Scooby Specialist
 
Member#: 348177
Join Date: Feb 2013
Chapter/Region: TXIC
Location: TX
Vehicle:
2002 Bugeye
Haltech GTX3584RS

Default

Quote:
Originally Posted by Layvon View Post
Someone said it a few posts back.

Edit. . . Didn't read your post for comprehension. They were aiming for this:
I know.

I was wondering if he measured his....
ALOKIN 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 01:43 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2020 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.