Welcome to the North American Subaru Impreza Owners Club Sunday April 20, 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 03-31-2009, 08:35 AM   #1
juanmedina
Scooby Guru
 
Member#: 133146
Join Date: Nov 2006
Location: SC
Vehicle:
07 FPgreen 7.37@95
WRX VF39+E85 12.0, 121mph

Default Building a high rev motor

My tranny took a dump like 2 weeks ago and I got something that can take some abuse.
I want to start buying stuff for a build motor, I read the stickies.
1st should I just buy a pre build block or build a custom one.
2nd the car is my daily driver.
3rd I want something that I can rev high
4th I would like to run a 35r or a 6262 on e85 with high boost.

About how much will this cost me? Should I start with a used block?
Thanks
* Registered users of the site do not see these ads.
juanmedina is offline   Reply With Quote
Old 03-31-2009, 09:43 AM   #2
06rexwagon
Scooby Specialist
 
Member#: 114730
Join Date: May 2006
Chapter/Region: SWIC
Location: Albuquerque, NM
Vehicle:
2006 WRX Limited Wag
9.9@142

Default

Hey Juan, how high do you want to rev? Things you need to consider are oiling and valvetrain. Upgrading the valve springs and cams will give you the top end high rev capability you want. Raw1performance sells a really good block that revs to 8500.
http://www.raw1performance.com/index_files/Page580.html
I just tuned one in an 07 STi with a 35R, stock heads, and BC 272 cams. He made 577whp on E85.
If you start with your own motor, you're going to spend a lot on machine work and balancing.
06rexwagon is offline   Reply With Quote
Old 03-31-2009, 09:58 AM   #3
juanmedina
Scooby Guru
 
Member#: 133146
Join Date: Nov 2006
Location: SC
Vehicle:
07 FPgreen 7.37@95
WRX VF39+E85 12.0, 121mph

Default

Quote:
Originally Posted by 06rexwagon View Post
Hey Juan, how high do you want to rev? Things you need to consider are oiling and valvetrain. Upgrading the valve springs and cams will give you the top end high rev capability you want. Raw1performance sells a really good block that revs to 8500.
http://www.raw1performance.com/index_files/Page580.html
I just tuned one in an 07 STi with a 35R, stock heads, and BC 272 cams. He made 577whp on E85.
If you start with your own motor, you're going to spend a lot on machine work and balancing.
Wow that's not bad at all, do you recommend sleeves as well? Did you take the beast to the track last saturday?
juanmedina is offline   Reply With Quote
Old 03-31-2009, 10:14 AM   #4
06rexwagon
Scooby Specialist
 
Member#: 114730
Join Date: May 2006
Chapter/Region: SWIC
Location: Albuquerque, NM
Vehicle:
2006 WRX Limited Wag
9.9@142

Default

Quote:
Originally Posted by juanmedina View Post
Wow that's not bad at all, do you recommend sleeves as well? Did you take the beast to the track last saturday?
I am not an expert on sleeved motors, but everything I've read says that for a daily they're not a good idea. They tend to have cooling issues and the dissimilar metals expand at different rates, which can cause to head gasket failures. There are plenty of threads on nasioc about it. I didn't take my car Saturday because I blew the rear diff on Thursday. I'm in the process of swapping in my R180.
06rexwagon is offline   Reply With Quote
Old 03-31-2009, 01:46 PM   #5
godforbid67
Scooby Specialist
 
Member#: 137168
Join Date: Jan 2007
Chapter/Region: South East
Location: ummm..... Andrewtech ftmfw!
Vehicle:
06 Built SGM WRX
35r, PPG, 280's, PSS9.

Default

how high do you want to rev? i will be revving to about 8,000 rpm on my new motor which costed just short of 7 grand. its going to be pretty damn expensive to go beyond that. my build is
cp pistons, brian crower rods, brian crower 280/280 cams, brian crower springs and retainers, jdm 12mm oil pump, brand new oem crank, arp head studs, cosworth bearings, and some more little things im sure im forgetting. all that installed was just short of 7 thousand. my tuner said its good to 8k rpms and will make much much power up there on the turbo im goin with (atp 35r).
godforbid67 is offline   Reply With Quote
Old 03-31-2009, 02:56 PM   #6
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: 3MI Racing LLC
Vehicle:
96 bastard child
search FIRST, then PM!!!

Default

how high do you want to rev, how lumpy of a cam can you stand and how much port velocity can you bear to loose at low rpm?

all questions that should come to mind when deciding on how to go about running high rpm and then actually making beneficial power at high rpm; on a street car.

I think everyone can guess my solution if they regular the built motor threads
Homemade WRX is offline   Reply With Quote
Old 03-31-2009, 03:52 PM   #7
godforbid67
Scooby Specialist
 
Member#: 137168
Join Date: Jan 2007
Chapter/Region: South East
Location: ummm..... Andrewtech ftmfw!
Vehicle:
06 Built SGM WRX
35r, PPG, 280's, PSS9.

Default

what is port velocity at low rpm???? also what is your cam set up homemadewrx??
you got any sort of videos of it idling?
im so excited to get my car back and cant wait for the lumpy idle!!
godforbid67 is offline   Reply With Quote
Old 03-31-2009, 04:35 PM   #8
kevinh211
Scooby Specialist
 
Member#: 56297
Join Date: Mar 2004
Chapter/Region: Tri-State
Location: Long Island NY
Vehicle:
2004 STi HTA Green
28psi, MSPT Tuned

Default

Quote:
Originally Posted by Homemade WRX View Post
how high do you want to rev, how lumpy of a cam can you stand and how much port velocity can you bear to loose at low rpm?

all questions that should come to mind when deciding on how to go about running high rpm and then actually making beneficial power at high rpm; on a street car.

I think everyone can guess my solution if they regular the built motor threads
2.3!!!
kevinh211 is offline   Reply With Quote
Old 03-31-2009, 06:29 PM   #9
Homemade WRX
Scooby Guru
 
Member#: 33782
Join Date: Mar 2003
Chapter/Region: MAIC
Location: 3MI Racing LLC
Vehicle:
96 bastard child
search FIRST, then PM!!!

Default

Quote:
Originally Posted by kevinh211 View Post
2.34 long rod!!!
Fixed if for you

Quote:
Originally Posted by godforbid67 View Post
what is port velocity at low rpm???? also
port velocity is the speed of the air through the cylinder heads ports.
that comment was really more to just show the trade off's that can be associated with making a high rpm motor that works well at high rpms. The shorter the rod ratio the bigger the cam and more aggressive the port job needs to be to keep the VE's up...those are essentially your torque curve.

As for video, I'm finally getting time to get my personal motor together I'm have a scheduled break after my current customer's build...I'll be putting the heads and starting on accessories tonight.
Homemade WRX is offline   Reply With Quote
Old 03-31-2009, 07:25 PM   #10
Chi_San
Scooby Guru
 
Member#: 53558
Join Date: Jan 2004
Chapter/Region: NWIC
Location: Deadford, OR
Vehicle:
2002 WRX Wagon
Silver

Default

Depends on how high you want to rev. 8k on a motor with high quality bearings and properly selected oil pump shouldn't be a problem.

You could always buy an EJ207, they are designed from the factory to go to 8,500 rpm. I do recall hearing about some of them having problems with thrust bearings, so be careful.

I want to build an EZ30R twin turbo that revs up to 10k. But, feasibility, money, and sanity come into play (it also doesn't have the right bore x stroke for that, no?)

There's a bit of a barrier around 9k, to get past it, you may need a specialized oiling system, or even a dry sump system.

Personally, I'd choose an AVCS 2.0 closed deck turbo motor. Tear it down, put forged everything into it, blueprint the block and heads, and go crazy with cam profiles. There's a lot of specifics to worry about when building a high revving motor, too many to really get into here.
Chi_San 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
Info on higher compression EJ20T high REV build quikcobra Built Motor Discussion 5 03-03-2010 08:35 PM
Build my 2.0l EJ207 or 2.2 Stroke it for 400+ whp and high rev??? prokaw875 Built Motor Discussion 20 11-24-2009 12:10 PM
Damage to motor from high revs? BlkTS02 Normally Aspirated Powertrain 5 04-18-2006 08:36 PM
High REV starts and quick shifting NEWAGEWRX Factory 2.0L Turbo Powertrain 30 08-02-2001 07:08 AM
('93-'01) sulfur smell with high revs? (going too fast too quick?) nkodemus82 Impreza Forum 5 04-18-2001 05:44 PM


All times are GMT -4. The time now is 10:21 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.