STI V3 heads
23 November 2009, 09:30 AM
#4
These one for sale were on a standard car also and have never seen high boost ! Shame I got aquired them after I had had my others rebuilt
Clivbe
23 November 2009, 10:33 AM
#5
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Hmm, did you know valve lift for intake and exhaust cams?
As i have v4 sti heads and would be nice to know if these heads have more aggressive cams.
Really thanks!
As i have v4 sti heads and would be nice to know if these heads have more aggressive cams.
Really thanks!
23 November 2009, 12:57 PM
#7
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Doh, i know that the castings, valves, springs and buckets are the same, but maybe the cams are different... I've searched everywhere for this info but i've not fount it
I know that v4 sti cams have the following characteristics (i've measured them...):
In lift : 8.50mm
In dur : 260° (at 0.1mm, plus 0.20mm of play)
Ex lift : 8.60mm
In dur : 246° (at 0.1mm, plus 0.25mm of play)
And that v4 wrx (italian) cams are :
In lift : 8.40mm
In dur : 256° (at 0.1mm, plus 0.20mm of play)
Ex lift : 8.40mm
In dur : 238° (at 0.1mm, plus 0.25mm of play)
From what i've read, the v3 sti has the best cam profile avaible...
I know that v4 sti cams have the following characteristics (i've measured them...):
In lift : 8.50mm
In dur : 260° (at 0.1mm, plus 0.20mm of play)
Ex lift : 8.60mm
In dur : 246° (at 0.1mm, plus 0.25mm of play)
And that v4 wrx (italian) cams are :
In lift : 8.40mm
In dur : 256° (at 0.1mm, plus 0.20mm of play)
Ex lift : 8.40mm
In dur : 238° (at 0.1mm, plus 0.25mm of play)
From what i've read, the v3 sti has the best cam profile avaible...
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23 November 2009, 09:22 PM
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No not at all, that the version3 are more aggressive than the version4 cams.
Heard it a few times and even remember the head honcho of sti saying his favourite Impreza was a version 3 sti, because the cams were the best.
Sorry though, I dont have anything concrete to back that up.
****Note, the post above should have said but don't have empirical data sorry***
Free bump for a great set of heads at a great price
Heard it a few times and even remember the head honcho of sti saying his favourite Impreza was a version 3 sti, because the cams were the best.
Sorry though, I dont have anything concrete to back that up.
****Note, the post above should have said but don't have empirical data sorry***
Free bump for a great set of heads at a great price
24 November 2009, 08:41 AM
#12
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Hahahha 
In any case would be nice to find if really the v3 sti has a more aggressive cams
It's quite easy to measure timings (a dial gauge and a protractor with the center hole enlarged are needed)... But it's quite time consuming
In any case, are one of the best performing heads.
In any case would be nice to find if really the v3 sti has a more aggressive cams
It's quite easy to measure timings (a dial gauge and a protractor with the center hole enlarged are needed)... But it's quite time consuming
In any case, are one of the best performing heads.
