In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

7900 experiment

Discussion in 'Chainsaws and Power Equipment' started by mdavlee, Sep 8, 2014.

Page 5 of 6
  1. mdavlee

    mdavlee

    Joined:
    Oct 21, 2013
    Messages:
    4,380
    Likes Received:
    10,478
    Did some work today on smurf number 1.

    026.jpg 030.jpg 031.jpg
     
    mdavlee, Oct 5, 2014
    #81 Top
    concretegrazer and SquareFile like this.
  2. Mastermind

    Mastermind

    Joined:
    Oct 5, 2013
    Messages:
    1,257
    Likes Received:
    5,593
    Location:
    Tennessee
    That's a 7910 jug Mike....
     
    Mastermind, Oct 5, 2014
    #82 Top
    Hedgerow, mdavlee and clemsonfor like this.
  3. mdavlee

    mdavlee

    Joined:
    Oct 21, 2013
    Messages:
    4,380
    Likes Received:
    10,478
    I figured that out. That's what you get now when you order a 7900 jug. I guess they're just buying one cylinder for them now. I do like the new black covers.
     
    mdavlee, Oct 5, 2014
    #83 Top
    clemsonfor likes this.
  4. Hedgerow

    Hedgerow

    Joined:
    Oct 8, 2013
    Messages:
    1,495
    Likes Received:
    4,849
    Location:
    SW Missouri
    Be interesting to see how the 7910 jug runs stock with 7900 can on it..
     
    Hedgerow, Oct 6, 2014
    #84 Top
    clemsonfor and mdavlee like this.
  5. Mastermind

    Mastermind

    Joined:
    Oct 5, 2013
    Messages:
    1,257
    Likes Received:
    5,593
    Location:
    Tennessee
    That will be much better than the 7910 can. It's a pile of crap.
     
    Mastermind, Oct 6, 2014
    #85 Top
    Hedgerow and mdavlee like this.
  6. mdavlee

    mdavlee

    Joined:
    Oct 21, 2013
    Messages:
    4,380
    Likes Received:
    10,478
    I looked at your 7910 thread last night after I found the part number was a 7910. I'm sure that stopped up muffler was hurting it.
     
    mdavlee, Oct 6, 2014
    #86 Top
  7. Mastermind

    Mastermind

    Joined:
    Oct 5, 2013
    Messages:
    1,257
    Likes Received:
    5,593
    Location:
    Tennessee
    I reckon I'll get a 7910 top end for my Solo. I have some ideas I wanna try......
     
    Mastermind, Oct 6, 2014
    #87 Top
    Kevin Smith, Hedgerow, DexterDay and 2 others like this.
  8. mdavlee

    mdavlee

    Joined:
    Oct 21, 2013
    Messages:
    4,380
    Likes Received:
    10,478
    I've got a 7300 top end here that's going to be another trial and error.
     
    mdavlee, Oct 6, 2014
    #88 Top
    clemsonfor likes this.
  9. Hedgerow

    Hedgerow

    Joined:
    Oct 8, 2013
    Messages:
    1,495
    Likes Received:
    4,849
    Location:
    SW Missouri
    That there gonna make a stroked 372...
    50mm right?
     
    Hedgerow, Oct 6, 2014
    #89 Top
    mdavlee likes this.
  10. mdavlee

    mdavlee

    Joined:
    Oct 21, 2013
    Messages:
    4,380
    Likes Received:
    10,478
    I think so. I need one more dolkita chassis so I can keep a constant.
     
    mdavlee, Oct 6, 2014
    #90 Top
  11. mdavlee

    mdavlee

    Joined:
    Oct 21, 2013
    Messages:
    4,380
    Likes Received:
    10,478
    Keiths saw
     
    mdavlee, Oct 6, 2014
    #91 Top
    clemsonfor, DexterDay, concretegrazer and 2 others like this.
  12. mdavlee

    mdavlee

    Joined:
    Oct 21, 2013
    Messages:
    4,380
    Likes Received:
    10,478
     
    mdavlee, Oct 6, 2014
    #92 Top
    DexterDay and concretegrazer like this.
  13. Hedgerow

    Hedgerow

    Joined:
    Oct 8, 2013
    Messages:
    1,495
    Likes Received:
    4,849
    Location:
    SW Missouri
    Looking at about a 12.5sec stock vs a ~9.5 ported...
    Pretty good gain for a 7900..
     
    Hedgerow, Oct 6, 2014
    #93 Top
    mdavlee likes this.
  14. mdavlee

    mdavlee

    Joined:
    Oct 21, 2013
    Messages:
    4,380
    Likes Received:
    10,478
    Yeah I think it averaged out to 12.75 and 9.65 or something real close. About 3 seconds pretty much.
     
    mdavlee, Oct 6, 2014
    #94 Top
    clemsonfor likes this.
  15. komatsuvarna

    komatsuvarna

    Joined:
    Jan 21, 2014
    Messages:
    86
    Likes Received:
    294
    Looks good Mike!
    I couldn't watch but about 20 seconds of the stock video lol.
     
    komatsuvarna, Oct 7, 2014
    #95 Top
    mdavlee likes this.
  16. mdavlee

    mdavlee

    Joined:
    Oct 21, 2013
    Messages:
    4,380
    Likes Received:
    10,478
    I know and it's a strong runner.
     
    mdavlee, Oct 7, 2014
    #96 Top
    Hedgerow likes this.
  17. Thoreau's cabin

    Thoreau's cabin

    Joined:
    Feb 10, 2014
    Messages:
    455
    Likes Received:
    1,767
    Location:
    Vandalia, Ohio
    The key is for location, the taper holds it. Bad fitting taper shears key every time.
     
    Thoreau's cabin, Oct 7, 2014
    #97 Top
    DexterDay likes this.
  18. Hedgerow

    Hedgerow

    Joined:
    Oct 8, 2013
    Messages:
    1,495
    Likes Received:
    4,849
    Location:
    SW Missouri
    That's why I use the cordless impact... Have not had one slip since using it...
    Ruined 2 shaved keys prior to that..
     
    Hedgerow, Oct 7, 2014
    #98 Top
  19. Moparmyway

    Moparmyway

    Joined:
    Sep 3, 2014
    Messages:
    846
    Likes Received:
    1,953
    Location:
    New York
    Which cordless impact ?
    I have to use the lowest of the 3 settings on my Metabo 1/2" cordless impact ............... and that setting cracked an Echo flywheel last summer on me !

    There is a feel for it .............. too tight and you wont hear or feel anything, but you will see that crack and then your day is ruined
     
    Moparmyway, Oct 7, 2014
    #99 Top
  20. Hedgerow

    Hedgerow

    Joined:
    Oct 8, 2013
    Messages:
    1,495
    Likes Received:
    4,849
    Location:
    SW Missouri
    Just a dewalt 20v impact driver... It's low power..
    I don't think it could crack a smile...
     
    Hedgerow, Oct 7, 2014
    #100 Top
    Chvymn99, MasterMech, mdavlee and 2 others like this.
Page 5 of 6