cam specs (STI v4 RA V-limited)
18 August 2009, 12:47 PM
#1
Scooby Regular
Thread Starter
Join Date: Feb 2005
Posts: 138
Likes: 0
Received 0 Likes
on
0 Posts
cam specs (STI v4 RA V-limited)
Hello everyone,
I'm struggling to find information on the cam profiles that came standard on all imprezas.
Although it seems like all pre-01 cars had the same head castings (with better flow characteristics than later models), sti and RA included, some say the V-Limited may have had much better cam profiles, close to WRC specs.
Do you have any information on these as I might have a deal on V4 STI RA V-Limited heads to go along with a 2,5L STI short block to make 420hp ;-) ?
I'm struggling to find information on the cam profiles that came standard on all imprezas.
Although it seems like all pre-01 cars had the same head castings (with better flow characteristics than later models), sti and RA included, some say the V-Limited may have had much better cam profiles, close to WRC specs.
Do you have any information on these as I might have a deal on V4 STI RA V-Limited heads to go along with a 2,5L STI short block to make 420hp ;-) ?
22 August 2009, 10:46 PM
#3
See post #10 of the below thread:-
https://www.scoobynet.com/general-te...ion-3-2-a.html
In it is a link to another thread 'let's play a game', which may be of use...
https://www.scoobynet.com/general-te...ion-3-2-a.html
In it is a link to another thread 'let's play a game', which may be of use...
Last edited by joz8968; 22 August 2009 at 10:49 PM.
23 August 2009, 04:18 PM
#4
Scooby Regular
Thread Starter
Join Date: Feb 2005
Posts: 138
Likes: 0
Received 0 Likes
on
0 Posts
Thanks for the reply, however the information is very much sparsed, and the only good one I found is that STI v3/4 have 8,5mm lift.
What I was looking for was for each model (STI v1-10, TypeR, Type RA, etc etc) the lift AND duration, to compare and see if there is a pair out there which can flow enough for 420 hp between 5000 and 7500 rpm included, on a 2,5L. Now this is clearly not achievable with standard WRX heads, which don't flow well at higher revs.
And at first sight 8,5mm lift on STI v3/4 is not sufficient either, although the valvetrain seems ready for 8000rpm.
What I was looking for was for each model (STI v1-10, TypeR, Type RA, etc etc) the lift AND duration, to compare and see if there is a pair out there which can flow enough for 420 hp between 5000 and 7500 rpm included, on a 2,5L. Now this is clearly not achievable with standard WRX heads, which don't flow well at higher revs.
And at first sight 8,5mm lift on STI v3/4 is not sufficient either, although the valvetrain seems ready for 8000rpm.
