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

Compression Ratio / Octane Rating

Discussion in 'Engine Building' started by klyph, Sep 14, 2006.

  1. klyph

    klyph Dismember VIP

    Messages:
    6,342
    Likes Received:
    262
    Joined:
    Aug 14, 2006
    Location:
    North Pole, AK
    Does anyone know how to figure what octane works best with different compression ratios? a chart would be awesome. I'm buildin the D16A1 & wanna know how high i can make the compression while still running premium pump gas. I don't wanna mess with octane boosters or AVGAS, cuz it's gonna be a driver. Thanks for any info!
     
  2. formby

    formby learning in progress

    Messages:
    5,735
    Likes Received:
    23
    Joined:
    Feb 19, 2003
    you can tune an engine so you can use whatever petrol you want
     
  3. d112crzy

    d112crzy im not a n0ob, trust me

    Messages:
    133
    Likes Received:
    1
    Joined:
    May 22, 2005
    usually, anything under 11.5 cr can still use pump gas. anything over that, I wouldnt run anything but race gas, especially if not tuned.

    once you get it tuned, you should be able to run on pump gas with some octane booster.
     
  4. formby

    formby learning in progress

    Messages:
    5,735
    Likes Received:
    23
    Joined:
    Feb 19, 2003
    yeah i forgot he's all motor not boosted....ahhh
     
  5. klyph

    klyph Dismember VIP

    Messages:
    6,342
    Likes Received:
    262
    Joined:
    Aug 14, 2006
    Location:
    North Pole, AK
    Ya, I'm thinkin about leavin the CR stock so i can boost it later. Jackson Racing Supercharger? GReddy Turbo?
     
  6. d112crzy

    d112crzy im not a n0ob, trust me

    Messages:
    133
    Likes Received:
    1
    Joined:
    May 22, 2005
    research? do some math to figure the cfm's you need for your power goal, then choose a turbo or supercharger.
     
  7. klyph

    klyph Dismember VIP

    Messages:
    6,342
    Likes Received:
    262
    Joined:
    Aug 14, 2006
    Location:
    North Pole, AK
    sorry just fantasizing out loud. cant really afford either. Maybe some day... For now, I'll just roll with what i can afford- stock bottom end, Stage 1 valvetrain, I/H/E, Integra ECU, wonder how much power a d16a1 like that would make?
     
  8. d112crzy

    d112crzy im not a n0ob, trust me

    Messages:
    133
    Likes Received:
    1
    Joined:
    May 22, 2005
    not much. unless you have a wild cam in there, the changes wont be drastic.

    a bump in compression by milling would do it good tho.
     
  9. Taco15

    Taco15 I wear stretchy pants VIP

    Messages:
    6,998
    Likes Received:
    203
    Joined:
    Jan 11, 2005
    Location:
    Tallahassee Fl
    my buddy andrew here is going 11.5.1 i think on his minimi. You can can run higher compression but it leaves very little room for error. I would say go 11.8 and tune it the day you fire it up if you want all motor power.

    OR leave it as is till boost time or save the money for a B16. To me its reallt worthless build and all motor d series when you can use the money for a b series and get more power from the factory. but what ever you want to do its your motor. i'm just putting my input.

    leave stock. just ovehaul the essentials,oil pump water pump. check internals make sure they are still to specs and save for boost.
     
  10. 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
    I ran 13:1 on 93 octane pump gas, but that was with reaaaaaally good tuning.
     
  11. Taco15

    Taco15 I wear stretchy pants VIP

    Messages:
    6,998
    Likes Received:
    203
    Joined:
    Jan 11, 2005
    Location:
    Tallahassee Fl

    thats why thinks i think its worthless to build an all motor d-series. Obvoisly to each his own but i would like to sink my money into making it as fast as i can. but yeah if he doesnt want gobs of hp then go ahead and knock yourself out:eek:
     
  12. Taco15

    Taco15 I wear stretchy pants VIP

    Messages:
    6,998
    Likes Received:
    203
    Joined:
    Jan 11, 2005
    Location:
    Tallahassee Fl
    screw the big block lets get a V12:D I see what your saying. 150whp is pretty good goal for a series i guess. thats about what a b16 will lay down stock( i think 140whp). i just figured he was trying to get the most power he could since he was considering high compression. I still stand with staying stock compression and boosting.

    sorry for offending the d sries guys:ph34r: *cough* blanco *cough*:D
     
  13. d112crzy

    d112crzy im not a n0ob, trust me

    Messages:
    133
    Likes Received:
    1
    Joined:
    May 22, 2005
    you can get as much hp you want as long as you have the money/time/engineering abilities to make/design parts.

    how do you think bisi got 390whp from a sohc F22, naturally aspirated?


    btw, he runs 8 or 9's in the 1/4.
     
  14. d112crzy

    d112crzy im not a n0ob, trust me

    Messages:
    133
    Likes Received:
    1
    Joined:
    May 22, 2005
    400whp on a D series is cake.

    vitaras and forged rods and a nice turbo can do this, easy.
     
Verification:
Draft saved Draft deleted

Share This Page