To Read If You're Considering Forged Pistons - Page 2 - Subaru Impreza WRX STI Forums: IWSTI.com
STI Forum
Join
Start New Thread Create Account Advertise FAQ Members List Contact
To Read If You're Considering Forged Pistons
To Read If You're Considering Forged Pistons
Go Back   STI Forums > > > To Read If You're Considering Forged Pistons
Reply
 
Thread Tools
Old 05-07-15, 03:20 PM   #11
yamahaSHO
BROtuner
Feedback Score: 7 reviews
 
Car: 2005 WRB
Fav Mod: Equal Length Header
My Subaru Parts for sale

Join Date: Oct 2007
Location: Denver, CO
yamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant future
Default Re: To Read If You're Considering Forged Pistons

I can't imagine why you would need more than one reserved spot...

As far as forged pistons, I've found Subaru's seem to be on the loose side. When I built my SHO motor, the PTW clearance with Wiseco pistons seemed to be closer to OEM PTW clearance of a Subaru. On the spare motor I am going to build, I will do a closed deck setup that will include the hone. It looks like you can tighten up the clearances safely doing so.
__________________
Looking at turbo upgrades? Click here.
jaz|TUNING

yamahaSHO is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Sponsored Links
Advertisement
 
Old 05-08-15, 02:15 PM   #12
Toivonen
Super Moderator
Feedback Score: 1 reviews
 
Car: 2013 STi Hatch
Fav Mod: Wicked Performance Group, Killer B stuff, RCE 3w Clubsport Coilovers, 13:1 rack, alignment, bushings
My Subaru Parts for sale

Join Date: Oct 2006
Location: A Happy Existence
Toivonen will become famous soon enoughToivonen will become famous soon enough
Default Re: To Read If You're Considering Forged Pistons

Quote:
Originally Posted by yamahaSHO View Post
I can't imagine why you would need more than one reserved spot...

As far as forged pistons, I've found Subaru's seem to be on the loose side. When I built my SHO motor, the PTW clearance with Wiseco pistons seemed to be closer to OEM PTW clearance of a Subaru. On the spare motor I am going to build, I will do a closed deck setup that will include the hone. It looks like you can tighten up the clearances safely doing so.
I did it in a haste because I don't know what I want to do with it, but it's a good article to read; even though it's for Hondas the concepts carry over and it's a good primer to read if someone is considering a built motor.
Toivonen is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Old 05-08-15, 02:18 PM   #13
funks
Advanced Mastery Level I
Feedback Score: 13 reviews
 
My Subaru Parts for sale

Join Date: Jul 2007
funks will become famous soon enough
Default Re: To Read If You're Considering Forged Pistons

yamahaSHO - considering you are going closed deck, you'll be running a 99.7X piston then right? I don't believe they have closed deck blocks from any vendor that's at the stock 99.5 bore.

Per Outfront, the close-deck process distorts the cylinder so they bore it to the next size up (usually 99.7X)
funks is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Sponsored Links
Advertisement
 
Old 05-08-15, 02:36 PM   #14
murfnamedsmurf
Advanced Mastery Level I
Feedback Score: 0 reviews
 
Car: 2012 DGM STI 5 door
Fav Mod: No car payment
My Subaru Parts for sale

Join Date: Apr 2012
Location: SE U.S.
murfnamedsmurf has a spectacular aura aboutmurfnamedsmurf has a spectacular aura aboutmurfnamedsmurf has a spectacular aura about
Default Re: To Read If You're Considering Forged Pistons

Also subd. Im all about any thread aimed at clearing up misinformation. Forged may be the way to go or it might not
murfnamedsmurf is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Old 05-08-15, 04:06 PM   #15
yamahaSHO
BROtuner
Feedback Score: 7 reviews
 
Car: 2005 WRB
Fav Mod: Equal Length Header
My Subaru Parts for sale

Join Date: Oct 2007
Location: Denver, CO
yamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant futureyamahaSHO has a brilliant future
Default Re: To Read If You're Considering Forged Pistons

Quote:
Originally Posted by funks View Post
yamahaSHO - considering you are going closed deck, you'll be running a 99.7X piston then right? I don't believe they have closed deck blocks from any vendor that's at the stock 99.5 bore.

Per Outfront, the close-deck process distorts the cylinder so they bore it to the next size up (usually 99.7X)
Yes, I will have to step up to a larger piston.
__________________
Looking at turbo upgrades? Click here.
jaz|TUNING

yamahaSHO is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Old 05-09-15, 05:19 AM   #16
mheyman
Premium Member
Feedback Score: 4 reviews
 
Fav Mod: Camber Camber Camber! Power! Wide ratio gearing! The rest is just support :)
My Subaru Parts for sale

Join Date: Feb 2012
Location: SJ USA
mheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of light
Default Re: To Read If You're Considering Forged Pistons

Quote:
Originally Posted by funks View Post
I'm looking for proven longevity . . . .

4032AL Pistons for the Subaru Platform = Cosworth, Mahle, Wossner, and Supertech. I want to snag Wossner 4032AL pistons coupled with a closed-deck block from Outfront (and the rest OEM) but they don't make them in 99.75 bore (closed deck process requires machining work so no 99.50 mm).

Want something reliable, doesn't need a rebuild for 100K miles - not building BIG power (as in, we are happy with our stock turbo's, or slightly larger than stock turbo like the DOM 1.5 XTR at most)

You shouldn't need a closed deck block for 1.5?
It's borderline for needing to be built at all?
__________________
IMHO, to justify its' price, the S209 needs to perform at least as well as my moderately powered 05 built beater, and even that might not convince me to buy one cause my next STI isn't likely to be moderately powered.

Last edited by mheyman; 05-09-15 at 05:23 AM.
mheyman is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Old 05-09-15, 05:39 AM   #17
Nigel
Developing Advanced Mastery
Feedback Score: 0 reviews
 
Fav Mod: Recaro Sportster CS w/ SAB
My Threads
Posts: 998
My Subaru Parts for sale

Join Date: Jun 2008
Location: Canada
Nigel is on a distinguished road
Default Re: To Read If You're Considering Forged Pistons

For an extra 7-800 CD isn't a bad idea especially if you might go even bigger later on.
Nigel is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Old 05-09-15, 02:50 PM   #18
mheyman
Premium Member
Feedback Score: 4 reviews
 
Fav Mod: Camber Camber Camber! Power! Wide ratio gearing! The rest is just support :)
My Subaru Parts for sale

Join Date: Feb 2012
Location: SJ USA
mheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of light
Default To Read If You're Considering Forged Pistons

Sure, stronger has no drawback if you can afford it, and "recent" blocks do seem weaker. At least Element reinforces all their blocks too. Still not sure its necessary for a 1.5. Never heard that recommendation for a GD block.

Also bigger than a 1.5 is not a 1.5.
__________________
IMHO, to justify its' price, the S209 needs to perform at least as well as my moderately powered 05 built beater, and even that might not convince me to buy one cause my next STI isn't likely to be moderately powered.

Last edited by mheyman; 05-10-15 at 07:24 AM.
mheyman is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Old 09-13-18, 12:09 PM   #19
S2000_Europe
Donating Member
Feedback Score: 2 reviews
 
My Threads
Posts: 74
My Subaru Parts for sale

Join Date: Mar 2012
S2000_Europe is an unknown quantity at this point
Question Re: To Read If You're Considering Forged Pistons

Why Subaru blocks has problems with forged pistons, many OEM brands, honda for example, has forged pistons and theirs engines last 100K miles. I made 50K with SC S2000.

It is because the block's design and metal alloy? or the problems comes when making big power +400 WHP and driving the car very hard
S2000_Europe is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools

Posting Rules
You may post new threads
You may 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 (USA,CO): Cosworth Forged 99.5mm pistons 8cd03gro Engine/Drivetrain/Performance Parts For Sale 2 02-17-15 10:01 PM
Tires/Wheels OFFICIAL weight of the Work Emotion CR Kai... esemes GD-General 20 04-02-14 05:32 PM
SOLD: BNIB JE FSR 99.5 Forged pistons CTSparky Engine/Drivetrain/Performance Parts For Sale 5 10-04-13 07:05 AM
Average engine longevity: 4032 vs. 2618 forged pistons? dantheman762 Built Motor Discussion 28 03-03-13 12:55 AM
FS (USA,CA): Mahle Forged pistons 99.5mm 9.2 c/r BRAND NEW, 3'' big maf housing Blackout713 Engine/Drivetrain/Performance Parts For Sale 20 03-21-12 03:49 PM


New To Site? Need Help? More

All times are GMT -8. The time now is 06:46 PM.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Designed & Powered by Domain Architect
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.