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Thread: Let's talk about "Mirrored Combustion Chamber Pistons".

  1. #51
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    Stop pissing on his face and start congratulating him, Charlie.
    The Internet: Where people who can't build sentences try to build cars.

  2. #52
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    Not sure what I was thinking.
    Oh well, suck it up and move on.

  3. #53
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    Quote Originally Posted by Josh Warriner View Post
    Stop pissing on his face and start congratulating him, Charlie.
    Congratulate me, for what?
    Pissing on whatever chances I had at access to the Tech Forums?

    What's this "Bi-Winning"?

  4. #54
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    Oh, you mean the un-required disclosure of accomplishments and other personal shit.

    I guess that was a petty attempt and trying to be taken seriously.

    Not sure what was wrong with the opening post of this thread.

    Quote Originally Posted by Chris Santos View Post
    I've been researching a lot on other forums and pretty much all over the internet trying to find information about turbocharged engines and mirrored combustion chamber pistons.

    In the picture below, you can see that the 4G63 combustion chamber is a "pent roof" design.
    Imagine a head gasket hanging on there and placing a ring around each combustion chamber.
    You'll have a ring that is concentric to the radiused portion of each combustion chamber, but you'll be left with two flat areas above and below the combustion chambers.
    These flat areas are within the 85-87mm diameter cylinders our 63's/64's are capable of but outside of the actual pent roof combustion chamber.



    "Mirrored Combustion Chamber Pistons" or "Quench Pad" designed pistons have flat spots in the piston crown that mirror these two flat areas.

    Here is a nice little comparison of a STD Wiseco piston on the left, and Quench Pad designed Wiseco piston on the right.
    They're not a perfect mirror to those combustion chambers, but are close.



    You can clearly see how the pistons on the left are going to leave a void of air/fuel inside the dish of the piston and under the flat spots of the head.

    The pistons on the right are going mirror the flat spots in the cylinder head and as the piston screams up to TDC these mirrored flat areas are going to squish any air/fuel mixture out of these areas and into the center of the combustion chamber.

    I've read for optimum quench/squish the clearances between the piston crown quench pad and the cylinder head deck need to be around .035" - .040".

    Marco at Magnus advocates them.
    AMS sells their version of Ross Racing Pistons with quench pads for Evos.
    I've heard of JE Pistons having them, but I can't find any pics.
    And apparently Wiseco has them, but aren't shelf stock for some reason.

    From what I've read there have been claims of being able to run slightly more boost and/or timing advance when using quenched pistons like the one in the picture on the right.

    I started this thread in hopes of stimulating some discussion concerning quench pad pistons and pros/con of their use in our turbocharged 4G63's/64's.

    Cheers!

  5. #55
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    What was it Byers once said about how when some people find themselves in a hole they stop digging but other people buy a tractor?
    The Internet: Where people who can't build sentences try to build cars.

  6. #56
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    The first post was fine. I posted what I considered a constructive response. It was kind of all downhill from there.
    -Charlie

  7. #57
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    I don't there was much wrong with this thread until you started taking everything like it was an attack on your heritage, class, knowledge, and ______<fill in the blank with appropriate attack point>. You won't get much "You go dude!" type shit around here but what you will get is access to a ton of real world knowledge, simply stated facts, and point blank responses. If you aren't open for criticism, then you best not start the conversation.
    a.k.a. Tevenor

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  8. #58
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    You go dude! All these other guys are dicks.
    I love Ty Pham and you can too and in just 3 easy payments of $9.95!

  9. #59
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    WOW, this was not what I anticipated clicking on this topic.

    Honestly you sound like someone who has worked hard for what they got and that is great, but frankly non of that matters and no one cares when it comes to the discussion here. We are here to share ideas and help one another because we share common intrests and appreciate the feedback from others here, no matter if its what we want to hear or not. Its not about feelings or egos, it about sharing information and advancement. You want someone to share your life story with do it some place else. You want people's opinions then don't get your panties all twisted when they give you thier honest opinion and you don't like it.

    So either discuss the dam topic or shut up. You are just making it worse for yourself.

  10. #60
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    Quote Originally Posted by Chris Santos View Post
    Pissing on whatever chances I had at access to the Tech Forums?
    Open your wallet and your dreams will come true.

  11. #61
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    testing

  12. #62
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    Oh man, I thought I got banned.

    I understand I fuckt up.

    I let my guard down, took shit personal and ranted.

    Throwing my personal shit out there was very stupid, and I regret it.

    I'd like to move on.

  13. #63
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    There is a reason why a lot of guys on here have been members for 5+ years and have less than 500 posts.
    Maximuscr31
    1998 Eclipse GSX -Almost ready to run

  14. #64
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    Quote Originally Posted by Chris Santos View Post
    I plan to look into NCRC Time Trials circuit.
    http://www.ncracing.org/timetrials.php
    NCRC is the least dramatic group I've open tracked with. See you out there.

  15. #65
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    I'd like to get down to the southern California tracks this year.

    Have you heard about these guys?
    http://www.speedventures.com/
    They have pretty good rates and they run events at Spring Mountain, California Speedway and Las Vegas Motor Speedway.

    Quote Originally Posted by Eddie Kim. View Post
    NCRC is the least dramatic group I've open tracked with. See you out there.

  16. #66
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    I am planning to run some speed ventures events this year. Alot of the cars that used to run redline are moving over.
    97 Eclipse GS-T 687whp/660tq Time Attack money pit

  17. #67
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    It costs a little more but Speedventures has better-skilled participants with more sign-ups in the race group category. I'll run with SV or NCRC anytime.

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