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Closed port or open port piston?

Discussion in 'Chainsaw' started by Huskybill, Sep 21, 2019.

  1. Huskybill

    Huskybill Addicted to ArboristSite

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    i was looking for a new piston for my early husky 162SE chainsaw. They come closed port or open port. It made me think how does the transfer ports work with a closed port piston. The piston has a full skirt? No windows.?
     
  2. Huskvarna hotellgäst

    Huskvarna hotellgäst ArboristSite Operative

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    162 cylinder and piston are the same style as 2100 (and 444, 133, 154, 266, 181)
    A 162 piston will work in a 61 but not vice versa.
     
  3. Mad Professor

    Mad Professor Addicted to ArboristSite

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    Piston has windows next to piston pin.

    piston comparison.jpg

    or case has passage to transfers that run from base of case to base of cyl where transfers start. Sorry no pic
     
  4. Huskybill

    Huskybill Addicted to ArboristSite

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  5. NSEric

    NSEric ArboristSite Operative

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    The opening for the transfers is low enough on the closed port cylinder the sides of the piston don't block it at bottom dead center.
    The open port is different with the opening for the transfers up higher so the sides of the piston need to have holes for flow.
     
  6. president

    president Addicted to ArboristSite

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    I thought that all 162se,s were closed port
    I know that they came with thin rings or 1
    thick ring .Wheres Niko?
     
  7. Huskybill

    Huskybill Addicted to ArboristSite

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    I have one 162se all ported I need to look at it.
     
  8. Huskvarna hotellgäst

    Huskvarna hotellgäst ArboristSite Operative

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    president and huskihl like this.
  9. huskihl

    huskihl Addicted to ArboristSite

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    Easiest way to remember it is -
    Windowed pistons are needed in side fed cylinders. The air needs to flow through the piston windows into the lower side fed transfer port.
    Non windowed pistons are designed for bottom fed cylinders.
     
    pioneerguy600 and TheTone like this.
  10. president

    president Addicted to ArboristSite

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    I agree
     
  11. Huskybill

    Huskybill Addicted to ArboristSite

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    i Ask here I knew you guys probably know. I was running a 266se around that time with my 2100. I was thinking on rebuilding the 162se would be better than running a smaller saw power wise.
     

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