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Thread: ring end gap?

  1. #1
    Join Date
    Jan 2006

    ring end gap?

    what should end gap be 4.50 bore gas with 871 blower approx 10 to 15 pounds boost?

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    I think no one has answered this question because it's kind of a trick question, with many different answers. Example, are you planning to run conventional rings or z-gaps? will they be top z-gaps or second ring z-gaps, all different.
    The biggest question of all is do you have true blower/nitrous pistons or are they conventional racing pistons?
    The difference being that conventioal racing pistons the top ring is only down from the deck about .250, where a blower piston the top ring is down 7/16" or approx .440.
    The blower piston ring doesn't take on as much heat as a conventional racing piston, therefore requiring less end gap.
    O'k with that being said, blower piston none z-gap top ring, .0055/.006 X bore size. None blower pistons .0065/.007 X bore size.

    Nitrous = same situation.

    Worse possible serineo, too little gap will pull the top off the piston, too much end gap it may smoke a little and lose a little compression. i'll take too much any day day of the week.
    I run .007 X bore size end gap on conventional forged pistons.
    Also you need more piston to cylinder cleanance with a blower VS normally asperiated.

    Below is Total seal recomendations.


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