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Another chainsaw dyno...

Discussion in 'Chainsaws' started by Red97, Jun 18, 2020.

  1. BonScott46

    BonScott46 Pinnacle OPE Member

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    Any stuffed 461’s in the line up?
     
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  2. Red97

    Red97 Mastermind Approved! GoldMember

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    I'm supposed to be getting one to port, it has not showed up yet.
     
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  3. Walter Glover

    Walter Glover Well-Known OPE Member

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    883C7F17-E8A6-4B69-B66B-49B5EE564B77.jpeg DA2B537D-1AC1-49FD-A1B8-A90A594C1386.jpeg Mounted and cal check with 6 pounds at 24” after torque arm and cal rod balanced out.
     
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  4. Walter Glover

    Walter Glover Well-Known OPE Member

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    Getting 1.5hp for Husky 51
    3.2hp for the 372xp FT
    5.33hp for the ms660 FT
    Need more sturdy brake for the 660 D2CCB170-0C34-4024-90B3-ED7179B642FC.jpeg
     
  5. Red97

    Red97 Mastermind Approved! GoldMember

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    Figure out a way to calibrate 2hp more into your calculations. Then those numbers would be pretty close to stock.

    As long as you do a before/after with the same settings the dyno should show a change. Not really a matter of what the numbers are.
     
  6. Nutball

    Nutball Pinnacle OPE Member GoldMember

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    How would he dyno a 2511t? It would have to do 2hp just to read 0hp. Any weaker and the saw would be measuring the dyno's power.
     
  7. markds2

    markds2 Pinnacle OPE Member

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    Hope this is OK posting this Joe
    20210409_115840.jpg 20210409_120826.jpg
     
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  8. Red97

    Red97 Mastermind Approved! GoldMember

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    That will be difficult.
     
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  9. Walter Glover

    Walter Glover Well-Known OPE Member

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    Thinking of connecting an electric motor to measure drag in amps increase and see where that gets me
     
  10. Walter Glover

    Walter Glover Well-Known OPE Member

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    Hooked up a motor and with the amp draw and voltage with assumed 80%EFF at a 0.8PF my dyno has 0.25hp losses at 860rpm. As I understand it inertia increases by velocity squared. 3x velocity = 9x hp loss. Therefore 0.75hp lost in spinning the drivetrain on my dyno. That helps the numbers some 51C7A436-00B2-4C3C-BF10-C953498D1FFF.jpeg
     
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  11. Sawrain

    Sawrain Super OPE Member

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    Hard to say what output power is that precisely, PF (power factor) varies greatly with load, and is most likely less than 0.8 if you are not near full load on the electric motor, could be 0.5 or less, what is the motors full load output rating?

    0.75hp seems like a lot, for comparison picture what a 0.75hp rated bench grinder can achieve, I would not have thought the parasitic loss would be equal to that, it could be, I’m just thinking out loud.

    You could just try to replicate Red97s results, find your correction factor by dividing your dyno HP reading by Reds dyno reading with a few different unmodified saws that have figures available in the dyno thread.

    It’s not really a calibration I know, but why not simply match the current aftermarket Dyno benchmark set by Red?
     
    Last edited: Apr 12, 2021
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  12. Red97

    Red97 Mastermind Approved! GoldMember

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    20210413_160118.jpg 20210413_154732.jpg

    Pair of ported 390's nice gain over the muffler mod only baseline.
     
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  13. Duane(Pa)

    Duane(Pa) It's the chain... GoldMember

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    Any guess what took the duce into the next digit hp wise? (and torque too I guess)
     
  14. Red97

    Red97 Mastermind Approved! GoldMember

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    Broke in vs brand new. That works out to 4% ish. Not as drastic as it looks.
     
  15. jacob j.

    jacob j. Beezlebubba GoldMember

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    That's what my last old lady told me... :embarazada:
     
  16. MustangMike

    MustangMike Mastermind Approved!

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    Very impressive, not just the increased Hp obtained, but the breadth of the increased power.

    I'll bet those saws will be real nice to work with.
     
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  17. Red97

    Red97 Mastermind Approved! GoldMember

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    Nice gains from the 4910.

    20210414_130302.jpg
    20210414_130424.jpg
     
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  18. CJ Brown

    CJ Brown I learned it from a hockey card...

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  19. huskihl

    huskihl Sausage Lives Matter

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  20. Red97

    Red97 Mastermind Approved! GoldMember

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    Thank you. It should be a runner for sure.

    10.4 pho

    Don't have that other one yet. But I plan on getting one as soon as I can...
     
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