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  1. #1
    RC Qualifier
    Join Date
    Jan 2013
    Location
    Gurley, Alabama
    Posts
    765

    Piston, which way?

    My 3.3 broke the rod yesterday, but after 13 gallons I can't complain. It's still running very strong so I'm just replacing the rod. Since the con rod was broke the piston had rotated a bit in the cylinder and I'm not sure which way the cut out on the piston skirt faces, the intake or exhaust. The exploded view doesn't show the cut out which would imply that it faces towards the intake, but I'm not sure and don't want to take any chances.

  2. #2
    RC Racer
    Join Date
    May 2012
    Location
    Toronto
    Posts
    168
    Jato 3.3 Pede 2.5R Rusty 3.3

  3. #3
    RC Enthusiast
    Join Date
    Apr 2012
    Location
    Redding CA
    Posts
    30
    i replaced my piston and sleeve last year and if I remember correctly, the cutout on the piston faces the carb, hope that helps

  4. #4
    RC Turnbuckle Jr. Nitronaught's Avatar
    Join Date
    Oct 2005
    Location
    South Florida
    Posts
    18,439
    The cutout faces the carb +1 AND there's an oil hole on the conrod, it too faces the front....
    Founder of H.U.A.
    Hop Ups Anonymous

  5. #5
    RC poster
    Join Date
    Mar 2013
    Location
    Sweden, Stockholm
    Posts
    14
    Do it right and replace the sleeve and piston too, if the conrod broke, you will most likely have a bad engine after you change the conrod only, if you read up on how important these parts are in an engine, you will see what I mean. The slightest scratch on the sleeve or piston will make it run like crap if you will get it going, or if you know what flaws to look for, make it happen.
    Kyosho Inferno TRX3.3 + Traxxas TQi + telemetry

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