Big Valve head

  1. Frequent Poster Joined: Apr 2007 Porthleven/Cornwall Posts: 601 corsa 1.2 Saxo VTR
    #1
    Is it possible to just upgrade the standard VTS valves for bigger ones? or would the better to get a 206 head and stick it on my VTS bottom end ?
  2. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #2
    You can't just put bigger valves in without making the ports any bigger...

    There's nothing wrong with a 206 head, but remember, if you just plonk it on, it's not going to have had any performance modifications to it, such as gas flowing, porting, etc.
  3. Saxperience Post Whore Joined: Oct 2005 Sydney Posts: 8525 Mango Westcoast
    #3
    have have it skimmed to increase the compression
  4. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #4
    Free power...
  5. Frequent Poster Joined: Apr 2007 Porthleven/Cornwall Posts: 601 corsa 1.2 Saxo VTR
    #5
    Quote:
    Originally Posted by Toad View Post
    You can't just put bigger valves in without making the ports any bigger...

    There's nothing wrong with a 206 head, but remember, if you just plonk it on, it's not going to have had any performance modifications to it, such as gas flowing, porting, etc.
    I was planning on buying a 206 head, getting it gas flowed and ported, proably have the valve springs changed, cammed and skimmed, then whacking it on with some high comp pistons
  6. Saxperience Post Whore Joined: Feb 2006 dudley United Kingdom (England) Posts: 6790 106 gti/ SEAT LCR
    #6
    Quote:
    Originally Posted by Tim_1 View Post
    I was planning on buying a 206 head, getting it gas flowed and ported, proably have the valve springs changed, cammed and skimmed, then whacking it on with some high comp pistons
    you will need to change the valve springs and use vts followers iirc anyway. as the 206 valve springs are soft as shit.
    make sure you work out compression ratio witht the 206 head and vts h/c pistons, and whatever head gascket you are going to be using.
  7. Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut
    #7
    BV heads are 750+ vat from qep but very very well set up and proven on flowbench and dyno etc..

    id fit one, but your pistons will need rebating/forgies.
  8. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #8
    Why would need modified pistons with a BV head?
  9. Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut
    #9
    valves with most cams will hit the pistons from what i was told. obvioulsy depends on duration/lift, but no point going mild cams if spending £900 on a head.
  10. Saxperience Post Whore Joined: Feb 2006 northumberland Posts: 7693 pulsar gtir, mk4 astra sxi
    #10
    id want some good head for £900
  11. Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut
    #11
    Quote:
    Originally Posted by williamsvts View Post
    id want some good head for £900
    i hear up north good head is only a tenner???


    marc you read about the new spec head from qep now additional time has been spent on flow bench/dyno with georges engine?
  12. Saxperience Post Whore Joined: Feb 2006 northumberland Posts: 7693 pulsar gtir, mk4 astra sxi
    #12
    havent been on the net for a while so havent read anything.

    if you have my skills head is free up north just gotta find the classy ladies lol (ryan) aka northern slags
  13. Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut
    #13
    lol. yep noticed you had been quiet, go check georges on ssc, done some fgood stuff with qep and the dyno
  14. Saxperience Post Whore Joined: Feb 2006 northumberland Posts: 7693 pulsar gtir, mk4 astra sxi
    #14
    on my way.
  15. Saxperience Post Whore Joined: Feb 2006 northumberland Posts: 7693 pulsar gtir, mk4 astra sxi
    #15
    what page is it on?
  16. Super Moderator Joined: Feb 2004 Tonbridge United Kingdom (England) Posts: 38236 Vtr, 172, throttle bodied track slut
    #16
    erm think it starts on 20. not 100% theres lots of posts by pumaracing on the development work. when the catcam 734s are being used.
  17. Newbie Joined: Mar 2008 Warrington Posts: 28 I Owned A Ford Escort Mk4 Now Own SAXO VTR Std
    #17
    does any1 know whether a vts head would just be able go on to my vtr i thought it would be ok but some people have told me it won't.
    wb asap thanks
  18. Saxperience Post Whore Joined: Feb 2005 St Andrews United Kingdom (Scotland) Posts: 7384 Green mk1 vtr/s and Focus zetec
    #18
    Quote:
    Originally Posted by Maskell1990 View Post
    does any1 know whether a vts head would just be able go on to my vtr i thought it would be ok but some people have told me it won't.
    wb asap thanks
    quick answer is no , long answer is not without a lot of (pointless) work.
  19. Saxperience Hardcore! Joined: Nov 2006 Durham Posts: 16000 Clio Trophy 025/500
    #19
    TBH correct me if am wrong, but its pointless having a big valve head, if you aint TB, turbo/charging it, this is where it will benefit the most, just having it done with all the usual mods, its not really worth it...

    Sure someone will correct me if am wrong
  20. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #20
    You're right Leeroy.

    I've got a BV head, but I'm not reaping the benifits as of yet as I'm still on stock intake. Still, N/A tuning has a lot to do with flowing of gases, so the bigger valves, i.e., bigger ports will allow for a larger quantity of air / fuel to be slammed into the cylinders. IIRC, the BV heads from QEP and HiFlow only increase the valves for the inlet side.
  21. Frequent Poster Joined: Apr 2007 Porthleven/Cornwall Posts: 601 corsa 1.2 Saxo VTR
    #21
    Might be a big valve head next month, got 6 weeks training so ill send it off and have a nice present when i get back!