Welcome to the North American Subaru Impreza Owners Club Monday January 26, 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 > 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 04-04-2009, 12:02 AM   #1
cribbie
Scooby Specialist
 
Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default Regrinding stock cams formore lift

Hey, I just met a guy today with a 99 RS 2.5L NA. We began discussing his build, and he started to talk about his stock cams that he had grind to some custom specs. He explain this process and it seemed very logical and affordable.
I have added a link showing his work and the theory of behind this.
http://www.coltcams.com/html/tech_tips/index.cfm

Now i would like to know is this a route worth doing on my engine build. I cannot afford a set a brand new BC cams, and i am unsure if STi cams are worth the money.
I was informed that all i have to do is find my largest shimmed bucket in my 03 WRX heads and find out what is the largest shim available, and pass this information onto the machinist along with where i want to acheive my power and how fast i plan on spinning my EJ22T.

BTW this process is about $80 a cam.
* Registered users of the site do not see these ads.

Last edited by cribbie; 04-04-2009 at 12:37 AM.
cribbie is offline   Reply With Quote
Old 04-04-2009, 12:10 AM   #2
hustleshark206
Scooby Specialist
 
Member#: 182227
Join Date: Jun 2008
Chapter/Region: NWIC
Location: seattle, WA/ Jackson WY
Vehicle:
2000 MPS Built RS
1991 Leggy Turbo EJ22t

Default

I was quoted more like $180 a cam from delta. They said they had to weld extra metal on each lobe and then grind it back down. Maybe this is different? No welding I guess. Let me know what you end up doing. I'm interested.

Edit: After looking at that link I am not sure that would work for your subaru. Grinding off the bottom of the cam would throw off valve lash way out of spec. You might be able to get some new buckets but that is going to cost a fortune at about $20 a pop. The guy with the 99rs has SOHC heads which are a different style than your WRX cam over bucket heads.

Last edited by hustleshark206; 04-04-2009 at 12:19 AM.
hustleshark206 is offline   Reply With Quote
Old 04-04-2009, 12:18 AM   #3
cribbie
Scooby Specialist
 
Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default

I know that there is no welding involved in this process. all he does is machine the "base lobe", which is were we make our measurements when doing valve adjustments. Then you compensate by increasing your bucket shim size from what he removed which then increases your lift.
Now what i would like to know is when people talk about a common BC 272/272 cam compared to a stock WRX/ STi cam does it have both more lift and duration?
cribbie is offline   Reply With Quote
Old 04-04-2009, 12:20 AM   #4
cribbie
Scooby Specialist
 
Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default

And i believe this process is very cheap and easy for heads with rocker arms (SOHC)
cribbie is offline   Reply With Quote
Old 04-04-2009, 12:24 AM   #5
hustleshark206
Scooby Specialist
 
Member#: 182227
Join Date: Jun 2008
Chapter/Region: NWIC
Location: seattle, WA/ Jackson WY
Vehicle:
2000 MPS Built RS
1991 Leggy Turbo EJ22t

Default

I think sti cams would be way cheaper and I have read many threads of people putting sti cams in wrx heads. You have to plug the avcs holes on the cam which seems like a pain in the ass but doable.
hustleshark206 is offline   Reply With Quote
Old 04-04-2009, 12:35 AM   #6
cribbie
Scooby Specialist
 
Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default

I understand this and i am very capable to under go what is required to install STi cams but considering that this process will run aprox $320 and a set of used STi cams go for around $200ish and the power still dives hard towards reline (just not ad bad as the WRX cams). I would rather spend a few extra dollars and go with something more specific to my build without buying a new set of BC cams for a grand.
cribbie is offline   Reply With Quote
Old 04-04-2009, 12:54 AM   #7
hustleshark206
Scooby Specialist
 
Member#: 182227
Join Date: Jun 2008
Chapter/Region: NWIC
Location: seattle, WA/ Jackson WY
Vehicle:
2000 MPS Built RS
1991 Leggy Turbo EJ22t

Default

Hey if you can do it for $320 out the door go for it. It just sounds to me that the machinist is going to determine how much he can grind off your cams by taking the biggest bucket thats available and subtracting the biggest bucket you currently have. By doing this would would have to replace every bucket in your head.

$80 x 4 = $320 for the grind
$20 x 16= about $320 for buckets
320 x 2= about $640 total

Maybe I am wrong here?? Anyone with first hand experience wanna chime in
hustleshark206 is offline   Reply With Quote
Old 04-04-2009, 07:12 PM   #8
cribbie
Scooby Specialist
 
Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default

I need some suggestions or recommends from experienced builders!
cribbie is offline   Reply With Quote
Old 04-04-2009, 07:20 PM   #9
sponaugle
Scooby Specialist
 
Member#: 4498
Join Date: Feb 2001
Chapter/Region: NWIC
Location: Portland, Oregon
Vehicle:
WRX H6-3.0 Turbo
www.surgelinetuning.com

Default

Quote:
Originally Posted by cribbie View Post
I need some suggestions or recommends from experienced builders!
Buy a set of real cams.

Seriously, this method is full of problems, and the cost of the buckets alone makes it expensive. As well, if you are planning on changing your lift, what are you doing with the valve springs?

Jeff
sponaugle is offline   Reply With Quote
Old 04-05-2009, 12:09 AM   #10
cribbie
Scooby Specialist
 
Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default

If this method is full of problems then i would like to hear of them. If i go ahead and buy a new set of cams or even go to a set of STi cams i will still require to purchase some new buckets regardless.
cribbie is offline   Reply With Quote
Old 04-05-2009, 12:13 AM   #11
gold rush
Scooby Specialist
 
Member#: 90110
Join Date: Jun 2005
Chapter/Region: W. Canada
Location: Sylvan Lake AB. Can.
Vehicle:
2004 wrx wagon
WRB

Default

Quote:
Originally Posted by cribbie View Post
If this method is full of problems then i would like to hear of them. If i go ahead and buy a new set of cams or even go to a set of STi cams i will still require to purchase some new buckets regardless.
You will need seriously thick buckets, better idea is to get the longer 2.5 N/A overhead cam length valves.
gold rush is offline   Reply With Quote
Old 04-05-2009, 09:53 AM   #12
cribbie
Scooby Specialist
 
Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default

how much longer are these valves?
cribbie 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
Stock cam specs and interchangability- 97 2.5 heads with 04 STi cams? boostedballs Built Motor Discussion 5 05-11-2010 01:10 PM
For sale stock sti heads plus stock cams... with knife edged intake divider west Engine/Power/Exhaust 7 07-08-2007 05:59 PM
cams : lift and duration dpjef Normally Aspirated Powertrain 2 05-14-2003 09:15 PM
Regrinding Stock CAMS?! Firewire Vancouver Impreza Club Forum -- VIC 14 10-24-2001 10:40 AM
Stock Cams and performance cam ideas... Reciprocity Technical Forum Archive 28 06-07-2000 07:37 PM


All times are GMT -4. The time now is 12:14 AM.


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.