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

b20 questions

Discussion in 'Engine Building' started by Citizen_Insane, Nov 2, 2004.

  1. Citizen_Insane

    Citizen_Insane Senior Member

    Messages:
    3,698
    Likes Received:
    3
    Joined:
    Jul 24, 2003
    Location:
    Minneapolis
    I was reading on some website that the stock b20z pistons don't have enough valve relief to account for a VTEC head. Does this mean that in order to do a b20vtec one would have to rebuild the bottom end? Would stock b16 pistons (pr3 right?) work, or does the b20 have a greater bore. I was thinking of putting my b16 head on a b20 block.....but I'm not sure what this entails. I tried searching and got some bullshit about using words less than 3 letters; which, btw, is REALLY FUCKING ANOYING!!!!
     
  2. b204dr

    b204dr Senior Member

    Messages:
    915
    Likes Received:
    0
    Joined:
    Oct 11, 2004
    Location:
    Minnesota
    b20 has a much greater bore its 2.0 with a 84mm i think b20 needs custom internals i would say
     
  3. handlebarsfsr

    handlebarsfsr Senior Member

    Messages:
    353
    Likes Received:
    0
    Joined:
    Jul 10, 2003
    b20= 84mm bore. b16/b18= 81mm bore. wont work. you either need to have the pistons very carefully ground out (bad idea) or get aftermarket forged units (good idea).
     
  4. 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
  5. Citizen_Insane

    Citizen_Insane Senior Member

    Messages:
    3,698
    Likes Received:
    3
    Joined:
    Jul 24, 2003
    Location:
    Minneapolis
    Hmm...ok, What about an LS, would I need to replace the pistons in that?
     
  6. brian11to1

    brian11to1 Senior Member

    Messages:
    9,203
    Likes Received:
    21
    Joined:
    Jan 9, 2003
    There is enough clearance for a B16 head onto a B20B/Z block, honda tuning did this with there 13 sec Four door.

    What do you mean, you would need to replace the pistons in the LS. Putting PR3 pistons in an LS results in a bump in compression. Something like 11:1.
     
  7. Citizen_Insane

    Citizen_Insane Senior Member

    Messages:
    3,698
    Likes Received:
    3
    Joined:
    Jul 24, 2003
    Location:
    Minneapolis
    I didn't know if the valve releifs on b18b pistons would be big enough to accomodate a vtec head. Thats what I meant.....I'm also still a little shady on using stock b20z pistons. Can anyone conferm that stock b20z pistons work?
     
  8. Hatchbackmatt

    Hatchbackmatt Member

    Messages:
    31
    Likes Received:
    0
    Joined:
    Aug 16, 2004


    I believe there is enough room for the valve releifs I am running a gsr head on mine and i have room. As for the pistons you should be allright....it's all about tuning get it all tuned right to perfection and u should be able to run 8200 rpm's like nothing.
     
  9. SlushboxTeggy

    SlushboxTeggy It's only stupid if it doesn't work VIP

    Messages:
    9,392
    Likes Received:
    245
    Joined:
    Sep 14, 2004
    Location:
    New Jersey

    dude did you read the final installment? they blew the motor because the valves were hitting and they spun a couple of bearings then rebuild the bottom.
     
  10. Citizen_Insane

    Citizen_Insane Senior Member

    Messages:
    3,698
    Likes Received:
    3
    Joined:
    Jul 24, 2003
    Location:
    Minneapolis
    Thats what I thought....now how about a b18b bottom end? Does that have enough valve relief?
     
  11. Bl6CRX

    Bl6CRX Senior Member

    Messages:
    1,553
    Likes Received:
    0
    Joined:
    Jul 14, 2003
    Location:
    UCLA
    Heres the situation, b20 will be able to have enough clearence with the vtec head with a redline at 8000, but you CANNOT TOUCH THE CAM GEARS OR CAMS without a risk, an option which no one mentioned is to have the pistons "notched" basically deeping the valve reliefs, i payed 150 for that, tapping the oil line, and torqueing the head on my setup, this stock b20b with a stock type R head is making 200hp and 145 at the wheels on my car, its a good way to go
     
  12. Citizen_Insane

    Citizen_Insane Senior Member

    Messages:
    3,698
    Likes Received:
    3
    Joined:
    Jul 24, 2003
    Location:
    Minneapolis
    are you using a b20z or b20b bottom end?
     
  13. Bl6CRX

    Bl6CRX Senior Member

    Messages:
    1,553
    Likes Received:
    0
    Joined:
    Jul 14, 2003
    Location:
    UCLA
     
  14. Citizen_Insane

    Citizen_Insane Senior Member

    Messages:
    3,698
    Likes Received:
    3
    Joined:
    Jul 24, 2003
    Location:
    Minneapolis
    gotcha, sorry I didn't catch that :)
     
  15. b204dr

    b204dr Senior Member

    Messages:
    915
    Likes Received:
    0
    Joined:
    Oct 11, 2004
    Location:
    Minnesota
    im running 11.3 but im not n.a and im four doors... definatly go forged that way you dont have to worry later that you wasted your money and will have to go rebuy pistons for application .. always think ahead to what you want the final build to be .. na , turbo , or what not so you can buy the right stuff the first time
     
  16. Citizen_Insane

    Citizen_Insane Senior Member

    Messages:
    3,698
    Likes Received:
    3
    Joined:
    Jul 24, 2003
    Location:
    Minneapolis
    Well, I wanted a simple project to boost my displacement. If I have to rebuild the engine I'm going to say "fuck it." I don't care THAT much, but I would really like to get some more torque. If I can find a cheap b20b or b18b block in a yard arround here for cheap, I may get it. We'll see.
     
  17. b204dr

    b204dr Senior Member

    Messages:
    915
    Likes Received:
    0
    Joined:
    Oct 11, 2004
    Location:
    Minnesota
    franks are well worth it if built right !
     
  18. brian11to1

    brian11to1 Senior Member

    Messages:
    9,203
    Likes Received:
    21
    Joined:
    Jan 9, 2003

    It ran didnt? lol...

    B204dr lets see some build specs...
     
  19. SlushboxTeggy

    SlushboxTeggy It's only stupid if it doesn't work VIP

    Messages:
    9,392
    Likes Received:
    245
    Joined:
    Sep 14, 2004
    Location:
    New Jersey

    yea after they notched the pistons and rebuilt it. but its better too spend like 150 now then replace bearings and shit later. plus you only have to build it once.
     
  20. brian11to1

    brian11to1 Senior Member

    Messages:
    9,203
    Likes Received:
    21
    Joined:
    Jan 9, 2003

    Sounds, odd to me.
     
Verification:
Draft saved Draft deleted

Share This Page