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

Building my b17a1

Discussion in 'Engine Building' started by fakk_13, Nov 6, 2006.

  1. fakk_13

    fakk_13 92GSRB17

    Messages:
    37
    Likes Received:
    0
    Joined:
    Oct 20, 2006
    Location:
    Oak Town, WA
    i recently perchased a b17 for my 92 gsr that has a b16 in it now. the motor is fried. i am going to rebuild it and i dont have to bore it out but i am wondering if it is worth it to bore it out now while i build the motor and put in highcomp pistons or should i just leave the bore and put highcomp pistons. so what im trying to ask is if the bore will make a significant amount of power over the stock bore? i am just planning on a small boring nothing to big. If you have any other suggestions just let me know.
     
    Last edited: Nov 6, 2006
  2. AHHVTEC

    AHHVTEC Well-Known Member VIP

    Messages:
    13,122
    Likes Received:
    245
    Joined:
    Oct 13, 2006
    Location:
    Alabama
    i say bore it
     
  3. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

    Messages:
    28,465
    Likes Received:
    228
    Joined:
    Sep 30, 2002
    Location:
    Dallas / Fort Worth, TX
    Small amounts of boring (like .5mm) aren't really worth that much in terms of power increases. You'll gain maybe 20cc if that... do the math. If you were willing to resleeve the block and go out to something like 84mm, then you're starting to talk about a significant gain. Keep the bore as close to stock as possible, maybe .5mm more to clean it up some- then go with nice high compression pistons, good cams, and a good tune. If you want go turbo, just get lower compression (or not if you're a good tuner) forged pistons, then start playing with the boost.
     
  4. fakk_13

    fakk_13 92GSRB17

    Messages:
    37
    Likes Received:
    0
    Joined:
    Oct 20, 2006
    Location:
    Oak Town, WA
    how much more hp do you think the .5mm bore and 11 / 1 comp pistons will give me?
     
  5. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

    Messages:
    28,465
    Likes Received:
    228
    Joined:
    Sep 30, 2002
    Location:
    Dallas / Fort Worth, TX
    A general rough rule is a 4% gain for every full point increase in compression. Go with that to estimate power.
     
Verification:
Draft saved Draft deleted

Share This Page