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Thread: When 2 Strokes 4 Stroke

  1. 12-15-2004, 06:24 PM #16
    timberwolf
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    No, ok I get it, the pipe is pushing back in unburned mixture that has both fuel and unused O2.

    that supports the idea that the muffler mod mixture change is required to make up for the lost fuel. Though this also may be in part absorbed by the changes incured by an increased RPM and the related mixture shifts created by the charichteristics of the carb.
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  2. 12-15-2004, 06:41 PM #17
    MacDaddy
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    look up pipes on the net and you find a site with a picture slide show of what happens inside a pipe
    Karts or parts wanted all Macs . In life you have to learn the difference between genius and stupidity is that genius has its limits
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  3. 12-15-2004, 07:10 PM #18
    bwalker
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    "Then why does it perfectly 2 stroke under load with the settings the same?"
    Because a two strokes fuel requirment changes with load.
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  4. 12-15-2004, 07:15 PM #19
    Crofter
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    I really was thinking muffler.
    P.S. Ben I think that could explain why if you open the muffler and increase the net output, the average load must be increased so a richer mixture is needed. At no load high rpm the load is light so the mixture is effectively rich enough to cause intermittent 4 stroking.
    Last edited by Crofter; 12-15-2004 at 07:22 PM. Reason: Post Script
    Frank
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  5. 12-15-2004, 07:19 PM #20
    MacDaddy
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    heat will burn the over rich mixture
    Karts or parts wanted all Macs . In life you have to learn the difference between genius and stupidity is that genius has its limits
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  6. 12-15-2004, 07:29 PM #21
    Crofter
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    Macman I guess you are right . Heat and load go together. It is maddening though to get your mind around not using enough fuel for the load (lean mixture) you burn your saw up.
    It is not surprising peope can get in trouble with 2 strokes!
    Frank
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  7. 12-15-2004, 09:01 PM #22
    usmc50bmgsniper
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    Talking

    I Agree With Crofter, And That Is Why People Get Into Trouble With 2 Strokes, I Have Been Working And Racing 2 Stroke Motorcycle Engines For Years And It Is The Same As A Chainsaw, A 2 Stroke Is A 2 Stroke No Matter What It Is In, I Adust The My Carbs So That It Burns A Golden Brown And If The Plug Is White Then Your In Trouble And Beeter Richen It Up Before You Fry The Engine, Alot Also Is The Temp And Elevation Of Where You Are At, A 2 Stroke Runs Richer In The Cold Winter Weather And Elevation Will Effect It. As For The Term 4 Stroken I Always That It Meant The Cycles Of A 4 Cycle Engine Which Is The Intake,compression,power And Exhaust Stroke But I Could Be Wrong
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  8. 12-16-2004, 01:28 AM #23
    Mange
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    The two stroke engine theory was not meant to be high tech. The Principals are good and the engin is sheep to pruduce, The intake fuel/air mix and exousts go in and out a little as it please. I do not mean this to be bad, simply stating the fact that there is more effective systems, just heavyer and more expensive.
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  9. 12-16-2004, 04:20 AM #24
    sedanman
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    Get your heads around this.........................In a conventional 2 stroke piston ported engine 25% of the fuel/air/oil charge delivered to the combustion chamber excapes un-burned out of the exhaust. Strato-charge engines like the newer Huskies prevent this by using a dose of pure air to purge the combustion chamber. An expansion pipe could actually be used to lower emissions.
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  10. 12-16-2004, 04:36 AM #25
    Gypo Logger
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    Hello Frank, what happens is that during incomplete combustion, the finger ports scavenge atomized fuel from the crankcase and transfers it to the transfer ports after it has become heated in the quad loops causing a preignition condition thereby giving a somewhat audible "pinging", sound that sounds much like the four stroking you described.
    This mechanical phenomonon can be remedied by simply turning in the H to seated then back it out 1/4 turn approx.
    Hope this helps Bud,
    John
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  11. 12-16-2004, 06:40 AM #26
    Fish
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    "Pinging?"

    You might have to elaborate on this technical term, many here have not
    been schooled on the pinging anomoly, and the theory behind it.
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  12. 12-16-2004, 03:52 PM #27
    WRW
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    Quote Originally Posted by Fish
    "Pinging?"

    You might have to elaborate on this technical term, many here have not
    been schooled on the pinging anomoly, and the theory behind it.
    Otto could set us straight on that.
    Bill
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  13. 12-16-2004, 04:09 PM #28
    Crofter
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    John, that sounds like fair exchange for my "fatherly" advice!

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    Frank
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  14. 12-16-2004, 04:17 PM #29
    Crofter
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    When a modified saw is tuned up to a higher rpm and expecially when it has a tuned pipe, it seems a little harder to know by sound what seems quite easy on a stock muffler saw. I remember some discussion a while ago about plug colours and the relation to mixture. I think some in 3 cut competitions run the saw a bit lean for that 4 or five second spurt. I have a hard time bringing myself to that. Will have to go look up that post on throttle chops. Sedanman, I believe you were in on that; do you know what it was posted under?
    Frank
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  15. 12-16-2004, 04:32 PM #30
    Lawn Masters
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    Quote Originally Posted by usmc50bmgsniper
    A 2 Stroke Runs Richer In The Cold Winter Weather And Elevation Will Effect It.
    I think you've made a slight mistake here, in cold weather air is more dense, so it runs leaner, not richer. cold air has more molecules compacted together, while the molecules of oxygen in hot air are more or less scattered around.
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