Piston Q?
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Piston Q?

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    Senior Member hotbo's Avatar
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    Default Piston Q?

    i have been looking at High compression pistons

    13-15-1 stuff.

    what is the difference in gas ported and regular pistons.

    then you have NOS ported pistons.

    so can someone explain what gives with all the types and explain when they are needed,thanks Travis
    WFLC


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    Senior Member lbhsbz's Avatar
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    Gas porting refers to a bunch of small holes drilled through the crown of the piston allowing combustion pressure to get behind the top ring, forcing it harder against the cylinder wall.

    Check out the venolia pistons website.... They've got a pretty good writeup showing just about everything you can do to a piston
    Last edited by lbhsbz; 08-21-2010 at 08:13 AM.

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    The Man cordog009's Avatar
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    Damn Trav, goin big or goin home huh?


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    Senior Member hotbo's Avatar
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    Quote Originally Posted by cordog009 View Post
    Damn Trav, goin big or goin home huh?

    well i have pretty much decided to go high compression,like Chris S.said compression is like money ,the more you throw at it the better,lol!!!!!!!

    yeah im thinking 14.1 565.

    just trying to figure out if i need GP pistons or just regular style?
    WFLC


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    built by Scott Seastrom.

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    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by hotbo View Post
    i have been looking at High compression pistons

    13-15-1 stuff.

    what is the difference in gas ported and regular pistons.

    then you have NOS ported pistons.

    so can someone explain what gives with all the types and explain when they are needed,thanks Travis
    This happens to be from the Wiseco web page:

    " Vertical gas ports are primarily used in drag race applications. Lateral gas ports are more often used in circle-track and road-race applications where carbon build up can occur. When gas ports are used, pressure is directed to build up behind the compression ring and seal it against the cylinder wall. This helps prevent ring flutter and extends the power curve upward in the RPM range. Vertical gas ports have the holes drilled from the deck of the piston into the top ring groove and behind the ring. Lateral gas ports are drilled through the bottom side of the top land and extend to the back wall of the ring groove"


    Travis for your boat application ( long term minimum tear downs) I think you would want to go lateral ports.

    A benefit of running gas ports would be (is) to reduce the compression ring size ( remember the most friction in and engine comes from the ring pack) if you can take the top ring down to .043 or so and reduce the tension and then let the gas ports do some work for you to reduce ring flutter you can still get a good ring seal and reduce friction. Best of both worlds right there.

    That's my understanding on it, there are a couple dozen ( at least) guys reading this that know far more than I do on the subject but that's my understanding of the situation. On this subject like many I know just enough to be dangerous

    My new pistons have lateral gas ports: 13:1



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  8. #6
    JGB
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    Unless it is a race only application, I would stay away from gas ports

    Dammit Sleeper, you beat me
    Last edited by JGB; 08-21-2010 at 11:04 AM.

  9. #7
    Senior Member hotbo's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    This happens to be from the Wiseco web page:

    " Vertical gas ports are primarily used in drag race applications. Lateral gas ports are more often used in circle-track and road-race applications where carbon build up can occur. When gas ports are used, pressure is directed to build up behind the compression ring and seal it against the cylinder wall. This helps prevent ring flutter and extends the power curve upward in the RPM range. Vertical gas ports have the holes drilled from the deck of the piston into the top ring groove and behind the ring. Lateral gas ports are drilled through the bottom side of the top land and extend to the back wall of the ring groove"


    Travis for your boat application ( long term minimum tear downs) I think you would want to go lateral ports.

    A benefit of running gas ports would be (is) to reduce the compression ring size ( remember the most friction in and engine comes from the ring pack) if you can take the top ring down to .043 or so and reduce the tension and then let the gas ports do some work for you to reduce ring flutter you can still get a good ring seal and reduce friction. Best of both worlds right there.

    That's my understanding on it, there are a couple dozen ( at least) guys reading this that know far more than I do on the subject but that's my understanding of the situation. On this subject like many I know just enough to be dangerous

    My new pistons have lateral gas ports: 13:1



    S CP

    well thanks sleeperthats the kind of info i was looking for.

    no its not race only,i play hard but i also want long term

    thanks Travis
    WFLC


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  10. #8
    gn7
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    Quote Originally Posted by Sleeper CP View Post
    ( remember the most friction in and engine comes from the ring pack)

    S CP
    Come on Sleeper. You have turned over both a short block and then a fully assembled motor, to know that isn't totally true.

    And yes, its still refered to as friction.



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    Quote Originally Posted by gn7 View Post
    Come on Sleeper. You have turned over both a short block and then a fully assembled motor, to know that isn't totally true.

    And yes, its still refered to as friction.
    But isn't the "pumping loss" off-set by the power created ? Pumping loss is friction ?

    I guess you'd have to do a dynamic compressions test. I know you can have a 10:1 engine with more cranking compression than a 14:1 engine because of cam timing. But the 14:1 makes more power anyway.

    S CP

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  12. #10
    gn7
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    Not the pumping loss. Spark plugs out. You feel that. Thats the biggest HP eater in the motor. BY FAR!!



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