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12:0:1 compression...safe?

Discussion in 'Engine Building' started by allmotorbeasteg6, Aug 28, 2004.

  1. allmotorbeasteg6

    allmotorbeasteg6 Member

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    how high of a compression do you think is still safe for a daily driven b18c with a built block? im thinking of going 12:0:1 but 11:5:1 sounds alittle safer. although i'll lose some power from the compression, but making a motor last a while is pretty important.

    anyone here knows someone thats driving with a 12:0:1 daily and isnt detonation at low end or when starting up the call while its hot?
     
  2. Bl6CRX

    Bl6CRX Senior Member

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    its all about tuning, my buddy runs 12:8:1 on pump gas, 12:0:1 will be fine if tuned properly, I wouldn't go any higher just because it sucks having to retard soo much to get it to run on pump gas...
     
  3. StyleTEG

    StyleTEG Senior Member

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    Depending on what cams you are using, you might make more power with the 11:5
     
  4. JDMilan

    JDMilan Senior Member

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    I would go with 12.0:1
     
  5. allmotorbeasteg6

    allmotorbeasteg6 Member

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    well im using a b16a head with some jg race cams, so i do have some pretty aggessive cams for the high compression. maybe ill just go with 11:8:1. :D
     
  6. StyleTEG

    StyleTEG Senior Member

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    Find out the dynamic compresson with those cams, and you find out exactly how much compression will net the most power. Why guess when you can be sure?
     
  7. MikeBergy

    MikeBergy Blah blah blah....

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    Talk to Cal. :)

    Seriously just make sure you have cams with enough lift and duration to make use of all that compression. There is nothing inherently wrong running 12.xx:1 CR, but if it isn't tuned properly, stuff starts blowing up. The dyno + tuning sessions are your friends.
     
  8. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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  9. MikeBergy

    MikeBergy Blah blah blah....

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    Come to think of it Mike, YOU need cams too. :)
     
  10. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Yup. I need money before cams though. :D
     
  11. integraslut78

    integraslut78 Stylus DJ Extraordinaire

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    As long as you tune it properly and redo your valve train I say go for 12:1.
     
  12. B16

    B16 Super Moderator VIP

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    i too need cams... i'm running 12.3:1 on 91 pump gas, with just ctr cams :(
     
  13. allmotorbeasteg6

    allmotorbeasteg6 Member

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    does your car ping while driving or denate when starting up the car while its hot? btw, what degrees is your timing set at?
     
  14. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Mine? No detonation, base timing at 14 degrees BTDC right now... was at 16 with 2 degrees advance on the intake cam, but we got lazy and put the cam back at zero without reindicating the distributor.
     
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