1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Should I get bigger valves for NA B16A??

Discussion in 'Engine Building' started by thompy.mark, Oct 26, 2007.

  1. thompy.mark

    thompy.mark New Member

    Messages:
    14
    Likes Received:
    0
    Joined:
    Sep 5, 2007
    Just wondering if I should be looking into getting bigger valves for my NA B16A build. Here's what I've got so far...

    Buddyclub Spec 3+ cams
    Double Valve Springs
    Ti Retainers
    Adj Cam Gears
    Skunk2 Intake Manifold w 70mm throttle body (possibly upgrading to ITB's at some stage in the future if the wallet allows...:D)

    Will also be getting some aftermarket extractors on there at some stage too, into a 2.5" exhaust.

    The head is at the shop at the moment getting a port and polish, and while its there I want to get some stainless valves. Herein lies the question...Should I be going oversize, or stay with the stock sizing? I know the PR3 head flows reasonably well with the stock size, but I guess its really a matter of weighing up extra volume (oversize valves) against slightly higher air velocity (stock) which will then allow for better air/fuel mixing.

    Thoughts/advice anyone??
     
  2. Hatchyspeed

    Hatchyspeed B20/TypeR Head

    Messages:
    32
    Likes Received:
    0
    Joined:
    Oct 22, 2007
    Location:
    Florida
    is your head port n polished?!? need a little more info then that one what to do i mean if ur heads got no valve angle job 3 / 5 ? u kno or its not port n polished i see no reason in going with bigger valves..
     
  3. thompy.mark

    thompy.mark New Member

    Messages:
    14
    Likes Received:
    0
    Joined:
    Sep 5, 2007
    The head is in at the shop at the moment, what I'm really after is:

    Is it worthwhile getting larger valves (and the required head work such as port and polish, valve job etc)? Just re-read my previous post, it wasn't too clear sorry.
     
  4. powerdriverh22

    powerdriverh22 Senior Member

    Messages:
    825
    Likes Received:
    2
    Joined:
    Jul 21, 2005
    Location:
    spfld, mo

    exactly. on h22's it is not possible to open both intake and exhaust valve openings with just s2s2's. most ive seen with those cams was .5mm on the intake side.

    b16 heads flow well so i dont think you need the bigger valves.
     
Verification:
Draft saved Draft deleted

Share This Page