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Old 02-04-2010, 12:46 PM   #1
OUScooby
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Default STI cams in 2.0 heads on 2.0 block?

Did a search and found a lot of stuff relating to hybrid builds, but I don't know how applicable any of that is to using sti cams on a 2.0 block.
I've got a lead on some cheap sti cams, slightly bigger than wrx cams with the same duration. would these be a direct swap on a 2.0 or would I have to change anything else?
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Old 02-04-2010, 01:15 PM   #2
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http://forums.nasioc.com/forums/show...s+in+wrx+heads


The search button is your friend.


Here ya go
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Old 02-04-2010, 01:39 PM   #3
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Default Re: STI cams in 2.0 heads on 2.0 block?

Quote:
http://forums.nasioc.com/forums/show...s+in+wrx+heads


The search button is your friend.


Here ya go
that's about a hybrid, reread OP and try again.
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Old 02-04-2010, 01:46 PM   #4
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um its still putting sti cams into a set of wrx heads its the same thing hybrid or not, wrx heads are still wrx heads on a 2.5 bottem end ect... on a hybrid


therefore in that thread lies the answer to your question
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Old 02-04-2010, 01:50 PM   #5
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Quote:
Originally Posted by OUScooby View Post
that's about a hybrid, reread OP and try again.
Quote:
Originally Posted by fastlanerex View Post
um its still putting sti cams into a set of wrx heads its the same thing hybrid or not, wrx heads are still wrx heads on a 2.5 bottem end ect... on a hybrid


therefore in that thread lies the answer to your question
wtf

You want to crack your block just to put STi cams in?
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Old 02-04-2010, 02:41 PM   #6
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basically if you plug the oil ports on the sti cams that final lobe wont try and force oil into the AVCS that aren't there.

some people on here believe that you still need the actuators for teh avcs cause they are part of teh sti cam. If you run the sti cam blocked/plugged, on wrx heads it's a drop and play. Just set valve clearance in spec with the right buckets and slap the valve covers on and rip. I'm not sure if the sti cams have a steep enough lobe to require a bumped idle to stop from "caming" but you shoud know after some time.

I did a lot of looking into this, but decided the sti cams were not really a big increase over the stock wrx ones, and frankly I didn't care enough I wanted my car back together.
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Old 02-04-2010, 02:48 PM   #7
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Default Re: STI cams in 2.0 heads on 2.0 block?

Quote:
basically if you plug the oil ports on the sti cams that final lobe wont try and force oil into the AVCS that aren't there.



some people on here believe that you still need the actuators for teh avcs cause they are part of teh sti cam. If you run the sti cam blocked/plugged, on wrx heads it's a drop and play. Just set valve clearance in spec with the right buckets and slap the valve covers on and rip. I'm not sure if the sti cams have a steep enough lobe to require a bumped idle to stop from "caming" but you shoud know after some time.



I did a lot of looking into this, but decided the sti cams were not really a big increase over the stock wrx ones, and frankly I didn't care enough I wanted my car back together.
thank you for the info. I've actually heard the are good for between 40 to 60hp at the top end with no lose at the bottom end. I'm still trying to find info to back up those numbers.
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Old 02-04-2010, 04:29 PM   #8
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Originally Posted by OUScooby View Post
thank you for the info. I've actually heard the are good for between 40 to 60hp at the top end with no lose at the bottom end. I'm still trying to find info to back up those numbers.
if you got the engine out or you're doing a build and have the time. Not a bad thing to add in, however I was time crunched. Another thing you should look at is a P&P on the heads the wrx heads can squeeze a bit more hp out of them making that came number into the 75-80hp range if your numbers are right.
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Old 02-04-2010, 04:33 PM   #9
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Quote:
Originally Posted by OUScooby View Post
thank you for the info. I've actually heard the are good for between 40 to 60hp at the top end with no lose at the bottom end. I'm still trying to find info to back up those numbers.
Another 40-60hp? Not even close on any setup small enough to not pop the stock motor. Maybe on a 35R, but the gains, although there, will be somewhat minimal on most 'normal' setups (i.e. 18G or smaller).
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Old 02-04-2010, 04:38 PM   #10
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Originally Posted by Audiosavvy View Post
Another 40-60hp? Not even close on any setup small enough to not pop the stock motor. Maybe on a 35R, but the gains, although there, will be somewhat minimal on most 'normal' setups (i.e. 18G or smaller).
I thought it was a bit high too.
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Old 02-06-2010, 10:05 PM   #11
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+1mm valves would be about the same cost and free up 30-40hp.. I bought Ferrea's for like 230. Stock stem diameter(no need to machine guides) so its just about having the heads machined for the +1 mm valve heads.



Specs on these valves are as follows:
  • F6078 (Intake Valves):
  • Head Diam: 37mm
  • Stem Diam: 5.97mm
  • Overall length: 104.6mm
  • Tip Length: 3.5mm
  • 19 Super Flo Radius Groove 1mm oversize
  • F6076 (Exhaust valves)
  • Head Diam: 33mm
  • Stem Diam: 5.96mm
  • Overall length: 104.75mm
  • Tip Length 3.5mm
  • 25 Flo Radius Groove 1mm oversize Special Alloy
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