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Compression/Ratio

Discussion in 'Engine Building' started by CRX_B16B, Oct 17, 2003.

  1. CRX_B16B

    CRX_B16B Senior Member

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    Will the c/r go up to 10.8:1 if you put the CTR pistons in a b16a?
     
  2. B16

    B16 Super Moderator VIP

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    check your other post, you asked the same question
    you will get around 11.5:1
     
  3. JDMilan

    JDMilan Senior Member

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    yup..

    and compression runs between 10.2-10.4 on oem B16a's.
     
  4. lsvtec

    lsvtec GNU/Linux Evangelist

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    Not according to c-speed. The have it at ~10.8:1 in an otherwise stock B16A.
     
  5. jiahanhao

    jiahanhao Senior Member

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    11.5:1 is s2000 territory =)
     
  6. B16

    B16 Super Moderator VIP

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    notice on c-speed how they consider the b16a/b to be the same block, whats up with that?
     
  7. dohch22a4

    dohch22a4 Senior Member

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    The B16A and B16B have different deck heights. The B16B shares the same height as the B18C whereas the B16A has a shorter height, i.e. higher compression when using pistons meant for the taller B16B. If tuned correctly, CTR pistons in an OEM B16A can yield good results, and even better gains if you use good cams such as TODA Spec B's.
     
  8. Bl6CRX

    Bl6CRX Senior Member

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    bottom line here, but them in, get a good set of cams, get it tuned right, and you'll rip!
     
  9. lsvtec

    lsvtec GNU/Linux Evangelist

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    Because the B16A/B have the same piston to deck clearance. They aren't saying the blocks are the same, just that the pistons are the same distance from the top of the block at TDC for the B16A/B.
     
  10. B16

    B16 Super Moderator VIP

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    i stand corrected, i did not look closely enough. i have always heard that you will be near 11.5:1 with ctr pistons in b16a and around 12:1 with ctr pistons in a b18c? and this whole time i've been spreading it too... :wtf:
     
  11. jamesA

    jamesA Well known pissed off telephone guy VIP

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    :huh: Wait, my brother always told me that a 99-2000 SI B16a2 has 10.0:1 compression, now you're all saying it has a 10.8:1?

    :eek:

    So whats the cutoff for having to use premium? my escort has a 9.0:1 and it will run fine on 87, yet a 10.0/.8:1 needs premium? :angry:
     
  12. B16

    B16 Super Moderator VIP

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    you don't read very well, they are saying you will have 10.8:1 if you put CTR pistons in a B16A.
    also, there is a nifty reference section that has engine specs.
    http://www.hondaswap.com/reference/index.p...de=engine&id=15
     
  13. jiahanhao

    jiahanhao Senior Member

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    Having a head on your car that dissipates heat better means you can use lower octane gas... I'd figure the cut-off for premium is at 9.5:1, but that's just a figure that came out of my ass.
     
  14. jamesA

    jamesA Well known pissed off telephone guy VIP

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    oops. sorry yeah I just skimmed it mostly.

    So the Si only puts out 111 torque? I thought it put 113 out. bah.
     
  15. ivanB16

    ivanB16 Junior Member

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    how did they will have the same piston to deck clearance when the CTR piston has a taller dome??
     
  16. lsvtec

    lsvtec GNU/Linux Evangelist

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    Because deck clearance is not measured from the top of the dome (or bottom of the dish) but from the edge of the piston which is the same distance from the wrist pin on all the B16 pistons (I believe on all the B series pistons but I am not sure about that).
     
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