Welcome to the North American Subaru Impreza Owners Club Tuesday September 16, 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 09-30-2007, 10:42 PM   #1
Spec V to Wagon
Scooby Newbie
 
Member#: 129715
Join Date: Oct 2006
Chapter/Region: MAIC
Location: Philadelphia
Vehicle:
03 Wagon
Silver

Default HOW TO: (w/ pics) STI cams in WRX heads

I searched and didn't find to much so I'm writing something up myself. My motor took a dump so I'm doing a 2.5 hybrid and I'm using STi cams. As you know STI cams can be used but the AVCS plugs need to filled. You can either weld them or plug them. I decided to plug them.

First you'll need some supplies

1. Eight (8) 5mmx5mm .8thread set screws

2. 5mm x.8 pictch tap

3. Red loctite

4. STi cams
5. Some grease
6. File
7. Carb cleaner
8. 2.5mm allen key

Step one.
Put some grease on the tap and run it down into each hole on the front side of the cam (4 on each cam.) Only the intake cams have these holes. Make sure that after each turn or so you back the tap out to clean off the filings.



Step two.
Make sure that all your holes are deep enough. The set screws want to be just below the surface of the cam. If they are deep enough you want to take the file and clean the face of the cam as when you tap it you'll pull material to the surface. Be carefull to not file the face of the cam to much.

Step three
Take the carb cleaner and clean all the holes with carb cleaner really well and make sure they are dry.

Step four.
Apply red loctite to the the threads of the set screws and screw them into the cam. Seat them just below the surface of the cam face.




Step five.
Enjoy.
* Registered users of the site do not see these ads.
Spec V to Wagon is offline   Reply With Quote
Old 09-30-2007, 11:14 PM   #2
wrxhard
Scooby Specialist
 
Member#: 108091
Join Date: Feb 2006
Location: Fargo, ND
Vehicle:
2002 WRX

Default

Ummmm... Carb cleaner usually leaves a light oily residue, i HIGHLY recommend using brake cleaner. The oily residue will affect how and if the loctite sets up.
wrxhard is offline   Reply With Quote
Old 09-30-2007, 11:17 PM   #3
S L O W W R X
Scooby Specialist
 
Member#: 95109
Join Date: Sep 2005
Default

Nice writeup thanks
S L O W W R X is offline   Reply With Quote
Old 09-30-2007, 11:29 PM   #4
Spec V to Wagon
Scooby Newbie
 
Member#: 129715
Join Date: Oct 2006
Chapter/Region: MAIC
Location: Philadelphia
Vehicle:
03 Wagon
Silver

Default

Quote:
Originally Posted by wrxhard View Post
Ummmm... Carb cleaner usually leaves a light oily residue, i HIGHLY recommend using brake cleaner. The oily residue will affect how and if the loctite sets up.
They set up very quickly. My turner told me to use carb cleaner so I did. But good advice to look out for.
Spec V to Wagon is offline   Reply With Quote
Old 10-01-2007, 06:47 PM   #5
Bombay994
Scooby Newbie
 
Member#: 108898
Join Date: Mar 2006
Chapter/Region: NESIC
Location: Dover NH
Vehicle:
2004 wrx
hybrid stg3..hang on 5MT

Default

I'm a few days away from my motor tear down and will be doing the same 2.5 hybrid with the STI cam swap....greatly appreciate this post...huge help!
Bombay994 is offline   Reply With Quote
Old 10-01-2007, 06:59 PM   #6
turboL
Scooby Specialist
 
Member#: 111735
Join Date: Apr 2006
Chapter/Region: South East
Location: Philly for now
Vehicle:
96 Legacy2.0GTSOLD
Bimmer Tech

Default

glad to see the cams worked out well for you jeff. Order buckets yet?
turboL is offline   Reply With Quote
Old 11-19-2007, 03:06 PM   #7
WJM
Guest
 
Member#:
Default

Nice.
  Reply With Quote
Old 02-09-2008, 08:37 PM   #8
Paulys05wrx
Scooby Newbie
 
Member#: 82433
Join Date: Mar 2005
Chapter/Region: MAIC
Location: Alexandria, VA
Vehicle:
2005 STi EFR 6738 &
WRX EFR 8734 Twin Scroll

Default

Thanks to Spec V for the write up... I followed it pretty much to the T. I had a few problems; The M5 tap I was using was a bit large in diameter and I had a hard time getting it in. My solution was to drill out the holes just a bit until my tap fit. My suggestion to anyone else who is doing this is to use a 8/32 tap which fits perfect but I do not know if you can find 8/32 set screws so I stuck with the above parts. Anyways just throwing my two sense in and here are a few pics of my finished product.



Paulys05wrx is offline   Reply With Quote
Old 02-11-2008, 11:49 AM   #9
jaxscuby
Sammo Hung
Moderator
 
Member#: 10613
Join Date: Sep 2001
Chapter/Region: South East
Location: S Ga / Hell Rock
Vehicle:
2002 USDM WRX
WRB

Default

nice job on the write up..
jaxscuby is offline   Reply With Quote
Old 02-11-2008, 04:16 PM   #10
wrx2k4
Scooby Newbie
 
Member#: 68632
Join Date: Aug 2004
Chapter/Region: SWIC
Location: phoenix, Az
Vehicle:
2004 wrx/xtra hybrid
psm

Default

+1 good stuff!
wrx2k4 is offline   Reply With Quote
Old 02-12-2008, 10:10 AM   #11
8Complex

Moderator
 
Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
Vehicle:
04 FXT
Red

Default

FWIW, the tap drill diameter for a M5x0.8 thread should be 4.2 (0.165"). If you drill those holes up to that size before tapping, everything should go smoothly.

Rule of thumb for metric threads, tap drill = thread diameter minus pitch (5 - 0.8 = 4.2).
8Complex is offline   Reply With Quote
Old 02-16-2008, 07:06 PM   #12
02wrximpreza
Scooby Newbie
 
Member#: 151601
Join Date: Jun 2007
Vehicle:
2002 WRX-Cobb Stage2

Default

Would it be worth while doing the cam swap in a WRX? Using WRX block and head?

If so what would the pros and cons be anyone know?
02wrximpreza is offline   Reply With Quote
Old 02-16-2008, 07:37 PM   #13
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

Why isn't this thread a sticky?
LiquidForce is offline   Reply With Quote
Old 02-18-2008, 12:39 PM   #14
Ralliart4
Scooby Specialist
 
Member#: 135927
Join Date: Dec 2006
Location: San AntonioTX/kingston Jamaica
Vehicle:
2002 Impreza WRX RA
PSM

Default

Please make this a sticky...
Ralliart4 is offline   Reply With Quote
Old 02-20-2008, 04:41 PM   #15
wrxwagon253
Scooby Specialist
 
Member#: 125620
Join Date: Sep 2006
Chapter/Region: NWIC
Location: Tacoma/Gig Harbor
Vehicle:
05 3076R Wagon
B5 S4 w/ Stg.3 RS6 kit

Default

Im getting ready to throw sti cams in my wrx heads and finish up my hybrid build..My question is are you guys still using stock wrx valvetrain with the sti cams? Im looking to do the same but am on a budget so im trying to see what my options are and whats in my best interest..Thanks
wrxwagon253 is offline   Reply With Quote
Old 02-20-2008, 05:56 PM   #16
paintbing
Scooby Specialist
 
Member#: 59388
Join Date: Apr 2004
Chapter/Region: RMIC
Location: Utah --> Monterey, CA
Vehicle:
2003 WRX - Hybrid
I do my own stunts

Default

Quote:
Originally Posted by wrxwagon253 View Post
Im getting ready to throw sti cams in my wrx heads and finish up my hybrid build..My question is are you guys still using stock wrx valvetrain with the sti cams? Im looking to do the same but am on a budget so im trying to see what my options are and whats in my best interest..Thanks
As the only difference in the STI cams and the WRX cams is the lift, you will be able to reuse the WRX valvetrain. I suggest you take the heads to a machine shop to be refurbished and have the lash set though. It's well worth the money.
paintbing is offline   Reply With Quote
Old 02-20-2008, 09:22 PM   #17
Paulys05wrx
Scooby Newbie
 
Member#: 82433
Join Date: Mar 2005
Chapter/Region: MAIC
Location: Alexandria, VA
Vehicle:
2005 STi EFR 6738 &
WRX EFR 8734 Twin Scroll

Default

Yes you may use the WRX valvetrain with no problems. Just check and re-check the valve lash and everything should be good! Good luck. Mine are on my motor now and it is getting put back in this weekend.
Paulys05wrx is offline   Reply With Quote
Old 02-20-2008, 09:33 PM   #18
AdamBOMB_STi
Scooby Specialist
 
Member#: 103419
Join Date: Dec 2005
Chapter/Region: BAIC
Location: South Bay, CA
Vehicle:
04.7 STi
LA Sleeved 2.5,35R,Hydra

Default

Awesome stuff man!

shameless plug, but I have a set of stock USDM 04 STi cams for sale.
AdamBOMB_STi is offline   Reply With Quote
Old 02-22-2008, 01:24 PM   #19
Paulys05wrx
Scooby Newbie
 
Member#: 82433
Join Date: Mar 2005
Chapter/Region: MAIC
Location: Alexandria, VA
Vehicle:
2005 STi EFR 6738 &
WRX EFR 8734 Twin Scroll

Default

Okay, I have everything in and ready to be started shortly. I am very very scared and concerned that the plugs I put in might leak. I have no reason to be concerned as i did the mod correctly it's just my human nature to worry I guess. Lets just say somehow a little bit of oil gets through those plugs, whats the worst case scenario? Oil leak from the cam seals area? Any comments are welcome to help calm my nerves.
Paulys05wrx is offline   Reply With Quote
Old 02-22-2008, 02:20 PM   #20
Spec V to Wagon
Scooby Newbie
 
Member#: 129715
Join Date: Oct 2006
Chapter/Region: MAIC
Location: Philadelphia
Vehicle:
03 Wagon
Silver

Default

I forgot about this thread and I was going through my photobucket account and saw the pictures were still hosted.

glad I could be a service!

As answered just doing the STI swap into a stock block and head wrx isn't worth the trouble. Though the stock valve train can be used cause the STI cams only have a higher lift.
Spec V to Wagon is offline   Reply With Quote
Old 02-25-2008, 09:23 PM   #21
turboL
Scooby Specialist
 
Member#: 111735
Join Date: Apr 2006
Chapter/Region: South East
Location: Philly for now
Vehicle:
96 Legacy2.0GTSOLD
Bimmer Tech

Default

doing mine now jeff. but wtf, tapping these holes is a bitch. My hands are raw, the tool is stripped (not the tap but the tap holder)...and I am only done two.
turboL is offline   Reply With Quote
Old 02-26-2008, 02:34 AM   #22
wrxwagon253
Scooby Specialist
 
Member#: 125620
Join Date: Sep 2006
Chapter/Region: NWIC
Location: Tacoma/Gig Harbor
Vehicle:
05 3076R Wagon
B5 S4 w/ Stg.3 RS6 kit

Default

Is there a easier way of plugging the holes that anyone knows of?
wrxwagon253 is offline   Reply With Quote
Old 02-26-2008, 11:21 AM   #23
turboL
Scooby Specialist
 
Member#: 111735
Join Date: Apr 2006
Chapter/Region: South East
Location: Philly for now
Vehicle:
96 Legacy2.0GTSOLD
Bimmer Tech

Default

JB weld.
turboL is offline   Reply With Quote
Old 02-26-2008, 05:18 PM   #24
Spec V to Wagon
Scooby Newbie
 
Member#: 129715
Join Date: Oct 2006
Chapter/Region: MAIC
Location: Philadelphia
Vehicle:
03 Wagon
Silver

Default

Quote:
Originally Posted by turboL View Post
doing mine now jeff. but wtf, tapping these holes is a bitch. My hands are raw, the tool is stripped (not the tap but the tap holder)...and I am only done two.

Make sure you use grease and back the tap completly out after like one full turn. The **** that grinds off will bind the hell out of the tap and make it very hard to keep going.

Like posted above, drilling the holes a little bigger will also work, though I don't know what size bit to use.
Spec V to Wagon is offline   Reply With Quote
Old 02-26-2008, 06:55 PM   #25
turboL
Scooby Specialist
 
Member#: 111735
Join Date: Apr 2006
Chapter/Region: South East
Location: Philly for now
Vehicle:
96 Legacy2.0GTSOLD
Bimmer Tech

Default

i drilled it...and then it was easier than pie.
turboL 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
How To: Install Evo X seats in wrx/STi xxscaxx Interior & Exterior Modification 171 12-25-2013 09:05 PM
sti cams in 2L heads wickedwrx2002 Factory 2.0L Turbo Powertrain 2 12-03-2007 05:43 PM
sti cams in wrx heads? ejsportcom Built Motor Discussion 22 06-22-2006 03:34 PM
do sti cams in wrx heads really make that much of a difference? legacy2003 Factory 2.0L Turbo Powertrain 5 01-15-2006 01:31 PM
STI cams in WRX heads=cel??? Davenow Subaru Conversions 0 03-28-2005 01:59 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.