Comparing two echo builds, 590 vs 620

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  • เผยแพร่เมื่อ 27 ส.ค. 2024

ความคิดเห็น • 20

  • @calebcrockett1085
    @calebcrockett1085 3 หลายเดือนก่อน +5

    Marketplace ad would say “Ported saws very fast, NOT FOR BEGINNERS” look like pretty good runners, definitely think aftermarket carbs are hit or miss.

    • @oakiewoodsman
      @oakiewoodsman 3 หลายเดือนก่อน +2

      Hello sir. I have always wondered about the AM 620 carbs. Cool that they exist but a bummer if they are flaky.

    • @Doc-Cole_Trickle-of-Chainsaws
      @Doc-Cole_Trickle-of-Chainsaws 3 หลายเดือนก่อน +2

      @@oakiewoodsman 👊

    • @Super-Dave-Outdoors
      @Super-Dave-Outdoors  3 หลายเดือนก่อน +2

      This one kinda serves it's purpose but i still want better reliability. I'll try modding the factory carb this evening and get a run in with a stocker from the shop so i know what was gained or lost, also going to swap coils.

  • @crazyfeller5704
    @crazyfeller5704 3 หลายเดือนก่อน +3

    👍👍all looked like pretty good runners to me!

  • @Doc-Cole_Trickle-of-Chainsaws
    @Doc-Cole_Trickle-of-Chainsaws 3 หลายเดือนก่อน +3

    👍🆙SD😁

  • @lonnieholbert8898
    @lonnieholbert8898 2 หลายเดือนก่อน +2

    What compression did you end up at?

    • @Super-Dave-Outdoors
      @Super-Dave-Outdoors  2 หลายเดือนก่อน +2

      PSI or corrected compression ratio?
      Feels like 160-180psi on the cord, corrected compression ratio is 7.4:1
      PSI measurement is nearly useless as a tuning metric in my eyes unless you are trying to derive a polytropic exponent from your cylinder layout.

    • @lonnieholbert8898
      @lonnieholbert8898 2 หลายเดือนก่อน +2

      @@Super-Dave-Outdoors Gasket delete or + shave the base? I know Bodie has been deleting+.010 off the base. I thought 7.4 was REALLY light when I read the manual on mine.

    • @Super-Dave-Outdoors
      @Super-Dave-Outdoors  2 หลายเดือนก่อน +2

      620 is 6.9:1 stock.
      590 is 7.2 stock (109 roof i think)
      80,124,104 with 65% bore width exhaust. 7.4:1 CCR
      .035 off the base .012 base gasket and about .020 from the chamber.
      The chamber on these is huge and you have to make the compromise of compression or port duration.
      This one wins in compression and duration over the stock saws.
      The one that beat it uses stock 620 numbers and different transfer angles. Higher CCR and lower roof too.

    • @zeromark202
      @zeromark202 2 หลายเดือนก่อน +1

      What’s with ported saws and failing oil pumps 😆
      Just got a ported 590, and oil pump just failed also! Have had probably around 15 non-ported
      590/620’s through my hands either bought, sold, flips, repairs, etc… and never seen a bad oil pump yet till now.
      Have you came close to free-porting with .035 off the base?
      Is the .012 gasket a stock one, ever tried the .006 performance gasket from Duke’s?

    • @Super-Dave-Outdoors
      @Super-Dave-Outdoors  2 หลายเดือนก่อน +1

      .012 is stock gasket. Dukes gasket material is fine. .006 wont make a noticable difference up or down.
      That oil pump was shot before the saw was ported. Every used one i have purchased has a crapped out oil pump.
      You will catch the ring of death in the top of the cylinder before freeporting becomes an issue. Like it sits it does not free port. If i could get away with more out of the chamber i would see how far you can push free porting before it becomes a problem.