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SiRI and SiRII

Discussion in 'Engine Building' started by SolPWR, Jun 18, 2004.

  1. SolPWR

    SolPWR Senior Member

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    whats the difference in these motors other than OBD? Why is the II $300 more in some cases? Would it be cheaper to get a SiRI then convert the OBD? Shed some light on the situation?
     
  2. 88bluehf

    88bluehf Senior Member

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    oil bars are different in the head...the sirI has cast oil bars and the sirII has extruded oil bars. first gen as 10.2 compression second gen has 10.4 compression the map sensor is not an integral part of the throttle body on first gen b16's. and a horsepower difference of about 8-10 depending on wear and tear. first gen as twin o2 sensors and the second gen has one four wire o2. if your getting a full swap the axles are different as well as the trannies.
     
  3. xj0hnx

    xj0hnx I wanna be sedated VIP

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    Differences between the SiR and the SIRII are things like powersteering ABS, factory tinted windows etc..., they are trim levels, not motor generations.

    As far as th generation differences between the motors, electronics and the aforementined things in 88blues post are the big ones.
     
  4. SolPWR

    SolPWR Senior Member

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    would an 95 LS tranny work on a SiRI in a 94 civic?
     
  5. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    it will work... but the gearing will suck
     
  6. pissedoffsol

    pissedoffsol RETIRED

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    and it will be a bitch to wire.

    you'll end up buying all sir2 electronics or totally re-wriign for things like distributors, alternators, injectors, and so forth...

    and sir1 cams are less lift/duration than sir2's.

    if you're planning to buy an sir1 over the sir2 in hopes of it being cheaper- in the end, you will spend more trying to get the sir1 to work, have a mirgraine from wiring, and still be slower than if you jsut bought the damn sir2 in the first place.
     
  7. SolPWR

    SolPWR Senior Member

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    hmmm interesting thoughts. i just might go b18b due to the fact that it will a street/autoX car and I like the low end.

    ok with the SiR's still in mind does it matter which head to use for ls/vtec?
     
  8. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    get the one that matches your OBD (less wiring bullshit)

    with that said the first gen B16 has slightly less agressive cams than the second gen B16

    SiR-1 and SiR-2 are often misused to describe first and second gen B16 engines... this is NOT accurate
    SiR-1 and SiR-2 are vehicle trim levels and have NOTHING to do with the engine themselves the SIR-1 and SiR-2 were BOTH available in the 5th gen chasis
     
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