Best Buy Co, Inc. Buy Used Saws CCC Ebay Store HLSupply Daily Deals

My friend installed a Hyway popup piston in his 261C

Discussion in 'Chainsaws' started by GlocknStihl, Oct 29, 2018.

  1. huskyboy

    huskyboy Sorta a Husqvarna guy.

    Joined:
    May 30, 2016
    Messages:
    4,118
    Likes Received:
    14,649
    Trophy Points:
    426
    Location:
    Ct
    Using the wrist pin to even them up would be more accurate
     
    Mkinslow and RI Chevy like this.
  2. GlocknStihl

    GlocknStihl Derelict OPE Member

    Joined:
    Aug 12, 2018
    Messages:
    189
    Likes Received:
    578
    Trophy Points:
    128
    Location:
    At God's feet
    All coming tomorrow
     
  3. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals)

    Joined:
    Dec 29, 2015
    Messages:
    6,147
    Likes Received:
    36,841
    Trophy Points:
    528
    Location:
    Strong Island NY
    Thanks for that.

    If they made a popup the same height as the normal crown, they didn’t do us any big favor. Making it higher would be better, as one would have to drop jug less over it.

    As said above, connect them by the pin and see whatcha got.

    If the popup is the same height as the stokers crown, the Hyway you send will decorate my shelving. I’d rather cut my own outa an oem slug than use any AM piston in a saw.

    Granted, some don’t have a lathe to do that.
     
    hseII, XP_Slinger, RI Chevy and 2 others like this.
  4. GlocknStihl

    GlocknStihl Derelict OPE Member

    Joined:
    Aug 12, 2018
    Messages:
    189
    Likes Received:
    578
    Trophy Points:
    128
    Location:
    At God's feet
    How about you cut me one out while you're at it? Lol How about porting my 261? Haha

    Mine is going back oem. The machine Mark's on the side of the popup just arent pronounced enough.
     
    RI Chevy and Mkinslow like this.
  5. BonScott46

    BonScott46 Super OPE Member

    Joined:
    Jul 20, 2016
    Messages:
    311
    Likes Received:
    681
    Trophy Points:
    178
    Location:
    Sweden
    Cant be the same height with a 20-25lb compression bump with the stock gasket. Will be interesting to see what the measurements are, the pop up doesn't looks relatively mild in the pictures but hard to say as it is a picture although the lack of machine lines is definitely apparent in the comparison pics.
     
    GlocknStihl, Mkinslow and RI Chevy like this.
  6. GlocknStihl

    GlocknStihl Derelict OPE Member

    Joined:
    Aug 12, 2018
    Messages:
    189
    Likes Received:
    578
    Trophy Points:
    128
    Location:
    At God's feet
    Connected by the wrist pin. They are pretty much level, so the bump is helping compression. If anyone else wants to try one, PM me.

    20181105_141840_crop_957x576.jpg
     
    smokey7, RI Chevy and Mkinslow like this.
  7. BonScott46

    BonScott46 Super OPE Member

    Joined:
    Jul 20, 2016
    Messages:
    311
    Likes Received:
    681
    Trophy Points:
    178
    Location:
    Sweden
    Edit: pop up looks relatively mild.
     
    GlocknStihl, RI Chevy and Mkinslow like this.
  8. Stihlsmoking

    Stihlsmoking City Hillbilly

    Joined:
    Feb 29, 2016
    Messages:
    1,288
    Likes Received:
    4,255
    Trophy Points:
    260
    Location:
    Cincy
    If I remember right the squish was at .030 thousandths and the popup was around .070 thousandths.
    I didn’t feel like making a gasket so I just sent it. Lol
     
    GlocknStihl, RI Chevy and Mkinslow like this.
  9. kingOFgEEEks

    kingOFgEEEks Pinnacle OPE Member

    Joined:
    Feb 9, 2016
    Messages:
    749
    Likes Received:
    2,595
    Trophy Points:
    240
    Location:
    Tioga County, PA
    The pins appear to be a bit wider apart. Any issues snagging anywhere?
     
    GlocknStihl, RI Chevy and Mkinslow like this.
  10. GlocknStihl

    GlocknStihl Derelict OPE Member

    Joined:
    Aug 12, 2018
    Messages:
    189
    Likes Received:
    578
    Trophy Points:
    128
    Location:
    At God's feet
    Top of pin to the crown is 0.8645" , top of pin to the rise is 0.8860". The popup is 0.0215"
     
    RI Chevy and Mkinslow like this.
  11. RI Chevy

    RI Chevy StihlMar Runner

    Joined:
    May 7, 2016
    Messages:
    14,718
    Likes Received:
    31,908
    Trophy Points:
    423
    Location:
    Ocean State
    The rings look like they are slightly different heights. That would change port timing slightly.
     
    GlocknStihl and Stihlsmoking like this.
  12. Stihlsmoking

    Stihlsmoking City Hillbilly

    Joined:
    Feb 29, 2016
    Messages:
    1,288
    Likes Received:
    4,255
    Trophy Points:
    260
    Location:
    Cincy
    I don’t remember what all I checked before installing now. But that is my saw in the video seems to run good.
    And that compression test is only after two tanks it may go up ? ( I hope ).
     
    BonScott46, RI Chevy and GlocknStihl like this.
  13. GlocknStihl

    GlocknStihl Derelict OPE Member

    Joined:
    Aug 12, 2018
    Messages:
    189
    Likes Received:
    578
    Trophy Points:
    128
    Location:
    At God's feet
    I'm still undecided on what to use in my saw. Seems kind of mean though, since I talked you into trying it in yours haha
     
    Stihlsmoking and RI Chevy like this.
  14. huskihl

    huskihl Sausage Fingers Forever

    Joined:
    Dec 31, 2015
    Messages:
    11,560
    Likes Received:
    61,361
    Trophy Points:
    534
    Location:
    East Jordan, MI
    Looks like the compression height from the pin to the top of the piston is close. Which would keep port timing the same. The rings being placed higher on the pop up piston would surely help the compression. Probably as much as the pop up
     
    smokey7, drf256, BonScott46 and 4 others like this.
  15. RI Chevy

    RI Chevy StihlMar Runner

    Joined:
    May 7, 2016
    Messages:
    14,718
    Likes Received:
    31,908
    Trophy Points:
    423
    Location:
    Ocean State
    Thanks for the clarification Kevin. I thought the rings determined the timing? I didn't realize that it was the piston top. Lol
     
    XP_Slinger, smokey7, Mkinslow and 2 others like this.
  16. Terry Syd

    Terry Syd Pinnacle OPE Member

    Joined:
    Jan 18, 2016
    Messages:
    1,024
    Likes Received:
    3,370
    Trophy Points:
    260
    Location:
    Comboyne, NSW Australia
    Pretty cool that we are starting to get after market pop-up pistons for saws. The MS 039 pop-up looks rather mild, but it bumps the compression up a fair bit, enough that I had to re-tune my compression release. I liked the extra torque for the cheap price. If you're going to rebuild a saw, an AM pop-up is a neat upgrade.

    The pop-up is more effective with a smaller combustion chamber to work with. I removed the base gasket from under the compression release and the spark plug to reduce the volume of the combustion chamber to give the pop-up a bigger influence on the compression increase.
     
  17. huskyboy

    huskyboy Sorta a Husqvarna guy.

    Joined:
    May 30, 2016
    Messages:
    4,118
    Likes Received:
    14,649
    Trophy Points:
    426
    Location:
    Ct
    You can change intake port timing by taking a bit off the intake skirt of the piston via filing it as well.
     
    Mkinslow and RI Chevy like this.
  18. BonScott46

    BonScott46 Super OPE Member

    Joined:
    Jul 20, 2016
    Messages:
    311
    Likes Received:
    681
    Trophy Points:
    178
    Location:
    Sweden
    How thick is the OEM gasket by the way?
     
    Mkinslow and RI Chevy like this.
  19. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals)

    Joined:
    Dec 29, 2015
    Messages:
    6,147
    Likes Received:
    36,841
    Trophy Points:
    528
    Location:
    Strong Island NY
    As for the machining lines being needed to hold oil, I’m not so sure.

    If anyone has a new oem Stihl 460 piston available, please take a pic. The new ones have nearly no machining lines noticeable unlike the 044 pistons, where they are clearly evident.

    I doubt the factory would allow the production of a smooth walled piston if it were so critical.

    I’ll see if I can grab a pic.
     
  20. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals)

    Joined:
    Dec 29, 2015
    Messages:
    6,147
    Likes Received:
    36,841
    Trophy Points:
    528
    Location:
    Strong Island NY
    Stihl 046 piston and one 044. 044 has the lines and is the 3rd pic. These are brand new.

    256684E5-BCB5-4971-9BD5-58E0F4FE4265.jpeg EA65D2C4-C161-4FBA-9351-05AFEBFE2EE9.jpeg 5589CE76-2B83-42D8-B520-142FA734C2F7.jpeg 674A30B3-A26F-4EC0-8075-A4A7E5285095.jpeg E9D1767E-812B-4F53-ABFC-DD5DC9CC41D2.jpeg
     
    Onan18, hseII, XP_Slinger and 5 others like this.
Loading...

Share This Page

Loading...
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice