• Welcome to SVTPerformance!

Pros/Cons of Running Higher Compression?

Discussion in 'Engine/Tuning' started by Rossim22, Mar 30, 2012.

  1. Rossim22

    Rossim22 New Member Established Member

    Messages:
    488
    Joined:
    Mar 24, 2010
    Location:
    Fort Myers, FL
    What exactly are the pros/cons of running higher compression with a ported eaton? Obviously more power with more risk of detonation but I'd like a little more specific. I've tried searching but the search function is horrible on this forum, can't search "compression" or "supercharger".

    Thanks for any help.
     
  2. Driver500

    Driver500 Member Established Member

    Messages:
    873
    Joined:
    Feb 26, 2007
    Location:
    Baton Rouge
    It depends on how much more boost, how much higher compression, and the quality of fuel in your area.

    You really need more specific details to get a more specific answer than you will be that much closer to predetonation and may need torco or other octane boosters to get by with pump gas.

    The pro is more power. The con is you're closer to/over the edge of pump gas limitations depending on your boost and compression.
     
  3. Carbd86GT

    Carbd86GT You're Gator Bait Established Member

    Messages:
    5,838
    Joined:
    Feb 29, 2004
    Location:
    Jupiter, Florida
    More compression makes the engine more efficient. More power N/A means more power in boost, and also better fuel economy during cruise, but more octane is also required. That's about the only con to more compression that I can think of, the type of fuel needed.
     
  4. jackers

    jackers Solid Axle Equipt Established Member

    Messages:
    1,318
    Joined:
    Mar 8, 2004
    Location:
    California, MD
    In some cases, you can crank up the compression and drop your timing and boost which helps keep IAT's down. I'd consult your engine builder on what he recommends.
     
  5. Rossim22

    Rossim22 New Member Established Member

    Messages:
    488
    Joined:
    Mar 24, 2010
    Location:
    Fort Myers, FL
    Sorry I thought I included some info. I'm actually trying to keep my posi ported cobra as this is more of a repair build, certainly not planned. Also, I feel I'd be MUCH safer on e85 but we only have one pump about 15 mins from my house, then it's over an hour to the closest spot. How much more hp would I get at 16-17psi stock to higher compression, about 9.5:1?
     
  6. 50q's

    50q's Member Established Member

    Messages:
    407
    Joined:
    Oct 17, 2011
    Location:
    Lancaster,Ohio
    If you go higher compression 9.5 isn't going to require e85. If I were you I would shoot for around 11.1 and run e85.
     
  7. Brutal Metal

    Brutal Metal Well-Known Member Established Member

    Messages:
    10,570
    Joined:
    Feb 2, 2009
    Location:
    Largo Florida
    go with an 11cc piston and you'll be all good!
     

Share This Page