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

Sleaving

Discussion in 'Forced Induction' started by import_racer, Oct 16, 2002.

  1. import_racer

    import_racer Member

    Messages:
    52
    Likes Received:
    0
    Joined:
    Oct 1, 2002
    Is it necessary to sleave your block if you are running 9 and under psi on a b16?
     
  2. 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
    It's sleeve, not sleave. It's not a bad idea to, but a stock B16 should be able to handle 9 psi. It all depends on your turbo sizing and engine build/condition though- go read our FAQ section for a bit.
     
  3. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    54
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home
    psi means nothing. its how much cfms the turbo will flow.
     
  4. CRX-YEM

    CRX-YEM Super Moderator Moderator VIP

    Messages:
    4,623
    Likes Received:
    54
    Joined:
    Sep 29, 2002
    Location:
    Wallingford, CT
    B, I have to say psi has something to do with it.
    the more positive pressure you push into the cylinder. the higher the cylinder pressure will be. ther'll be more force on the cylinder walls.

    Pressure = Force/Area
    therefore
    Force= Pressure x Area

    if your pushin 9psi into a cylinder that's 75mm bore x 84.5 mm stroke (which has a surface area = 2 pi r 2 rh) that's gonna have a good sized reaction force.
    r=37.5mm (1.47 in) , h=84.5 (3.32 in), pressure = 9 psi

    (9 psi) x ([2 x pi x 1.47 ^2 ] [1.47 x 3.32])
    (9 psi) x ([13.57 sq/in] [4.8804 sqin])
    9 psi x 18.45 sq/in = 166 lbs/sqin

    that's 166 lbs/sqin of reaction force acting on those cylinder walls.
    plus whatever forces are already being generated from the stock setup.

    I guess the volume of air ther turbo can flow has more of an effect of how much volume of air/fuel mixture gets into the cylinder but pressure has an effect as well
     
  5. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    54
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home
    granted-- BUT psi as far as turbo's go is the measurement of air pressure NOT going into the motor. in other words, this psi is seen BEFORE the throttle body.
     
  6. SnailOnARampage

    SnailOnARampage Senior Member

    Messages:
    278
    Likes Received:
    0
    Joined:
    Sep 29, 2002
    Location:
    Utah

    I swear he just made up that math :)

    9psi = 9psi (pounds per square inch)...not 166 PSI

    All you really need to know is what the air pressure is at sea level...which is 14.7 psi

    If you were running 14.7 psi of boost to your engine at sea level, you would essentially be doubling the amount of air getting into your engine...if you were running 7.4 psi...you *should* be increasing the air getting into your engine by about 50 percent


    So some THEORETICAL numbers for a b16a engine under boost might look something like this:

    3.6 psi of boost = a b16a that produces 139 ftlbs of torque/200 crank hp


    7.4 lbs of bost = a b16a that produces 166 ft/lbs of torque/240 crank HP

    11 lbs of bost = a b16a that produces 194 ft/lbs of torque/ 280 crank hp

    and so on and so forth...

    When you are putting 7.4 psi of boost into your b16a...you are essentially putting 50 percent more air in the engine...to make 50 percent more power.
    Sooo...you are putting about 50 percent more stress on the internals. Hondas are built from the factory to EASILY withstand 50 percent more stress on the internals. You don't get problems with sleeves cracking from the extra power...sleeves crack when you get pre detonation (AKA pinging).

    If you have a good intercooler, and run high octane fuel...the chances of running into pre detonation are minimal at 7 or 8 psi. But when you run lower octane fuels and have lots of hot air coming into your engine...your chances for pre detonation increase exponentially...and likewise your chance of blowing the fuck out of your engine.
     
  7. SnailOnARampage

    SnailOnARampage Senior Member

    Messages:
    278
    Likes Received:
    0
    Joined:
    Sep 29, 2002
    Location:
    Utah
    yes...nevermind that I figured out what you are talking about with that math...the 166 psi comes in after the air has been compressed. but 166 psi should still only be something like 60 percent higher than the compression without the turbo.
     
  8. import_racer

    import_racer Member

    Messages:
    52
    Likes Received:
    0
    Joined:
    Oct 1, 2002
    Um, yeah, sure, okay!!! lol
     
  9. SnailOnARampage

    SnailOnARampage Senior Member

    Messages:
    278
    Likes Received:
    0
    Joined:
    Sep 29, 2002
    Location:
    Utah
    Any other ideas? I think mine's right...but I'm open to suggestins
     
  10. knowledge

    knowledge Senior Member

    Messages:
    1,410
    Likes Received:
    0
    Joined:
    Sep 30, 2002
    Location:
    Beale AFB, CA
    It all has to do with it! Brian is correct. You can think what you want or believe whom you want!
     
  11. CRX-YEM

    CRX-YEM Super Moderator Moderator VIP

    Messages:
    4,623
    Likes Received:
    54
    Joined:
    Sep 29, 2002
    Location:
    Wallingford, CT
    now I get ya B.
    makes more sense to me now
     
  12. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    54
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home
    you guys did all that math for nothing

    lol
     
  13. SnailOnARampage

    SnailOnARampage Senior Member

    Messages:
    278
    Likes Received:
    0
    Joined:
    Sep 29, 2002
    Location:
    Utah

    DAMN IT!
     
  14. turntune

    turntune Member

    Messages:
    73
    Likes Received:
    0
    Joined:
    Sep 29, 2002
    Location:
    Boca Raton, Florida
    yes pissed is right
    9 psi on T25 verses 9psi on a T100 are very very different...still 9psi...but the VOLUME of air is far different...so what pissed is saying is....psi don't mean squat unless you know the size turbo!
     
Verification:
Draft saved Draft deleted

Share This Page