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Stihl 084 and 088

Discussion in 'Chainsaw' started by GeorgeWLogger, Feb 6, 2003.

  1. GeorgeWLogger

    GeorgeWLogger ArboristSite Operative

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    I am wondering what is the differance in the two models? The specs. are the same on both.
    Model Displacement (cm³) Power(kW/HP) Weight (kg)


    STIHL 084 121.6 6.3/8.6 9.4
    STIHL 088 121.6 6.4/8.6 9.9

    Was it changed to meet emissions/EPA Regulations? Or is there major internal differences in the two powerheads?
     
  2. kdhotsaw2

    kdhotsaw2 ArboristSite Member

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    stihl084/088

    Hello George,
    The 088 and the 084 are the same sized motors but there are considerable differences inside. the 088 develops more power than the 084 does when they do stock. the factory changed a number of the things we were doing on our woods modifications, all for the better. they changed the combustion chamber volume from 13.5 cc to 11.5 cc. they lowered the squish clearance from .043 to .034. both these mods increased compression. they changed the transfer duct so it is now a straight shot into the barrel. the tonsil that hung dowm into the 084's inlet duct is now gone. they increased the exhaust duration slightly and changed to a slightly larger cast aluminum muffler. Also went to the newer fiberglass flywheel. probably has 1-1.5 more foot pounds of torque. also the lower transfer area in the case is larger so you can process more air-fuel mixture. all in all the 088 is a better saw
    i have 2 new 088's left to modify if anyone is interested. put in a photo of one of my 084's making a .9 second cut in a 8 by 8 cant
    ken
    kdhotsaw@hotmail.com
    530-589-2744
     
  3. Ryan Willock

    Ryan Willock Addicted to ArboristSite

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    Ken, what is the biggest bar that a stock 088 can effectively pull in the softwoods out your way??? i've seen pics of people running 72'' bars but was wondering:angel:
     
  4. kdhotsaw2

    kdhotsaw2 ArboristSite Member

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    088 bar length

    hello ryan,
    up on the north coast in california in the redwoods they are currently using up to 8 ft bars with skip chain . lots of 4-5 foot bars used on that sized saws. we should check with uncle Art(Art Martin) , I think he used to use longer bars than that when he was falling up there
    That is a 28 inch bar i'm using in the photo to test that size racing chain but normally use my 17 inch bar. can get the cutting time downto .6 seconds with that sized bar and chain with a pipe fitted to the 084 stihl. that particular saw now belongs to none other than the legendary gypo logger john lambert
    ken
     
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  5. GeorgeWLogger

    GeorgeWLogger ArboristSite Operative

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    Ken,

    Are you saying that the 084 is not a "good saw"? Or that in its original form was lacking power? Stock to Stock, how much more power does the 088 have over the 084?

    GeorgeW
     
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  6. Ryan Willock

    Ryan Willock Addicted to ArboristSite

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    thanks Ken!! on that size bar are people running 3/8ths or .404??
     
  7. kdhotsaw2

    kdhotsaw2 ArboristSite Member

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    stihl 084

    Hello George,
    The original stock 084's just didnt run all that great stock. when we modified them they ran very well. they were designed 10-15 years before the 088's came out. Stihl realized that they could make power by changing some of thier port timing figures and some of the bottlenecks in their 084 designed saw without losing any of their dependability so they incorporated many of the features we put in our modified saws. viola! more torque, more cutting power. the hp and torque figures are almost the same but the two saws don't run the same, the 088 has 10-15 more power stock and 35-40 % more power modified.
    ken
    kdhotsaw@hotmail.com
    530-589-2744
     
  8. GeorgeWLogger

    GeorgeWLogger ArboristSite Operative

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    Ken,

    Can the performance gains be aquired by only cylinder modifications? Or are crank case mods also required?

    GeorgeW
     
  9. kingcole1111

    kingcole1111 ArboristSite Lurker

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    need 084 cylinder

    hey i was wandering where a guy could find a parts 084 or where to get cylinder for one for 150.00 or less
     
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  10. GASoline71

    GASoline71 Mr. Nice Guy (Moderator)

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    Start a new thread... you'll get more hits that way...

    try ebay.

    Gary
     
  11. markvanzee

    markvanzee ArboristSite Member

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  12. blsnelling

    blsnelling Site Sponsor

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    I would not remove it.
     
  13. 2dogs

    2dogs Addicted to ArboristSite

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    Sometimes an 8 1/2 year old post is a gem, like this one.
     
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  14. mtngun

    mtngun Addicted to ArboristSite

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    +1

    If true, that's good data.

    The compression ratio on my 084 was indeed lame, in stock form.

    084 transfer duct looks just like other Stihls to my eye.

    084 exhaust duration about 170 degrees, dunno why it would need to be increased.
     
  15. Man of $tihl

    Man of $tihl ArboristSite Operative

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    The comp on my stock 084 is about 140 psi. What is the norm?
     
  16. 7hpjim

    7hpjim Addicted to ArboristSite

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    Mine is @ 150, I didn't think that was too bad!
     
  17. blsnelling

    blsnelling Site Sponsor

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    Same on mine. Very high for a work saw.

    Mine is 170-175 cold;)
     
  18. 7hpjim

    7hpjim Addicted to ArboristSite

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    I saw the vid of your 084 build, yours is a totally different animal now!!:rock:
     
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  19. what-a-stihl

    what-a-stihl ArboristSite Operative

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    084

    I'm building a 084 now and I just purchased a gas tank/handle assembly but after reading this post it sounds like a 088 should be the saw to build. Is the handle/tank the same between the two? Or if I do build the 084 are there any mods i should do as I'm building it? thanks
     
  20. w8ye

    w8ye Addicted to ArboristSite

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    I have a stock 084 with a .404 full compliment chain X 30" bar.

    I use it to buck big trunks. It pulls the chain just fine. I run the mixture at the 2/4 point.

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