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ls V-Tec

Discussion in 'HYBRID -> EG-EK / DC' started by CYULOST1, Jan 14, 2004.

  1. CYULOST1

    CYULOST1 Junior Member

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    I'm going to build a Ls V-tec and i want to know if a SiR1 head have a difference of performance compare to SiR2 head. The block is a b18b.
     
  2. xj0hnx

    xj0hnx I wanna be sedated VIP

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    Nope
     
  3. rudeludenotmeanthough

    rudeludenotmeanthough Senior Member

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    its "vtec" one acronym not v-Tec.. rembering this will help you not to get flamed in future post
     
  4. civicious

    civicious FüK-VTEC VIP

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    i thought sirII had more aggressive cams than sirI?

    maybe i was wrong....hmph
     
  5. xj0hnx

    xj0hnx I wanna be sedated VIP

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    SiR ans SiRII are trim levels, not generational indicators. Maybe the cams are diff, but pistons, ECU, vtec engagment probably play a much bigger role.
     
  6. 1sikEH2

    1sikEH2 Member

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    cams are slightly more aggressive
     
  7. xj0hnx

    xj0hnx I wanna be sedated VIP

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    Show me the specs.
     
  8. 1sikEH2

    1sikEH2 Member

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    B16A
    Intake
    open: 10° before TDC
    close: 40° after BDC
    valve lift: 10.1 mm

    Exhaust
    open: 40° before BDC
    close: 7° after TDC
    valve lift: 9.0 mm

    B16A2/3
    Intake
    open: 10° before TDC
    close: 40° after BDC
    valve lift: 10.5 mm

    Exhaust
    open: 40° before BDC
    close: 7° after TDC
    valve lift: 9.4 mm

    B18C1
    Intake
    open: 10° before TDC
    close: 40° after BDC
    valve lift: 10.5 mm

    Exhaust
    open: 40° before BDC
    close: 7° after TDC
    valve lift: 9.4 mm

    The B16A2/3 and B18C1 have the same cam specs.
     
  9. MaaseyRacer

    MaaseyRacer Senior Member

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    I do not buy that as the B16a2 and B16a3 are both USDM motor that put out ~ 160hp at the fly. Both use PR3 pistons, where the 2nd gen b16s used P30 pistons. The second gens put out ~ 170hp at the fly, honestly I would think that they would put out more horse power if they had more aggressive cams, along with the new mapped out ecu, and a bump in compression.
     
  10. sleepercivic

    sleepercivic Senior Member

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    there is a difference betwenn first and 2nd gen b16s
    2nd gen supposedly have better oiling and slightly more aggressive cams than first gens, as well as slighly higher compression on JDM models
     
  11. xj0hnx

    xj0hnx I wanna be sedated VIP

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    Stock Specs from Civic Si
    ------------------------------
    advertised duration
    Int-265 mid
    Exh-267 mid

    duration @ .05
    Int-219 mid
    Exh-214 mid

    gross lift w/ 1.55
    Int-.412 mid
    Exh-.379 mid

    Stock Specs from GS
    -------------------------
    advertised duration
    Int-274 mid
    Exh-276 mid

    duration @ .05
    Int-230 mid
    Exh-216 mid

    gross lift w/ 1.55
    Int-.423 mid
    Exh-.378 mid

    These are from Crower, they don't list a difference in 1st and second gen. And no the GSR and B16A2's don't have the same specs.
     
  12. 1sikEH2

    1sikEH2 Member

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    Beleive what you want. I am just giving the facts. But if you that that little increse in lift and a .2 increase in compression is gonna give you significantly more than 10 hp I don't know what to tell you. Also, The B16A, w/ smaller cams, has the same HP as a B16A2/3 because the stock ecu has a more aggressive tune. This is due to the fact that emissions arent as strict in Japan.
     
  13. xj0hnx

    xj0hnx I wanna be sedated VIP

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    Facts? Where?
    Not trying to sound like a dick, but a source of those specs would be nice, mine are from Crower. Also before saying oh this (emissions) is like this in Japan, reference some Japanese Smog regs, because I know in Europe, TUV is WAYYYYY worse than the US, and they get all the same cars Japan does. Maybe you're thinking of the B16A auto cams.
     
  14. 1sikEH2

    1sikEH2 Member

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    I can beleive that the GSR and Si cams are different, I would take Crower's word over neones. But wether ne of these specs are the correct ones so far everything i have researched says the SIR2's are Bigger than the SIR1's
     
  15. civicious

    civicious FüK-VTEC VIP

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    yeah, and doesnt it say in our very own swap section that sirII's had more aggressive cams than the sirI's?


    and wouldn't referring to the motors as sirI's and II's (which the motors are referred to by in the reference section) be like saying "It's an Si or a DX motor"? they're different....
     
  16. sleepercivic

    sleepercivic Senior Member

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  17. 1sikEH2

    1sikEH2 Member

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    Hybrid Honda
    THE ABOVE LINK GIVES ALL THE INFO YOU PEOPLE ARE LOOKING FOR

    as far as the smog goes, it's pretty well known that Japanese cars run on higher octane and dont have emmisions that are as strict. Sorry i don't have the smog laws from Japan :roll: . If you wanna go look up the specific smog regs to prove me wrong then be my guest.
     
  18. xj0hnx

    xj0hnx I wanna be sedated VIP

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    Maybe, I'd like to see the source on the cam specs no the less.

    And no, they are different trim levels, but they have the same motor, so when you say one is one spec and the other is another, you are not correct when talking about the motors. It's like saying the EX and the Si are different motors.
     
  19. civicious

    civicious FüK-VTEC VIP

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    the EX and Si ARE different motors, dude.
     
  20. highperboi

    highperboi Senior Member

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    i think he was talking about the 92-95 models
     
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