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

Echo cs 730 hybrid

Discussion in 'Chainsaws and Power Equipment' started by Red97, Dec 19, 2017.

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  1. Red97

    Red97

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    Intake 79
    Exhaust 98
    Transfers 118.5

    Widen the ex a bit more. Close to 60% of the bore just left a burr finish when I decide I'm done playing I'll smooth it out.[​IMG][​IMG][​IMG]

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    Red97, Dec 19, 2017
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  2. Redfin

    Redfin

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    I like those numbers Joe.
     
    Redfin, Dec 19, 2017
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  3. Fifelaker

    Fifelaker

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    Just about the perfect firewood saw, weight of a 60cc and the hindend of a 70cc.
     
    Fifelaker, Dec 20, 2017
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  4. J. Dirt

    J. Dirt

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    When you say needs more blow down what are you referring to? Raising and or opening the exhaust port to let it out sooner and faster?
    Might I say this is some awesome work!!! Wish I had some skills like this I’m more of a 4lb hammer repairman :loco: :crazy: :D
     
    J. Dirt, Dec 20, 2017
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  5. The Wood Wolverine

    The Wood Wolverine

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    Awesome build! Very nice grinding work. :dremel:
     
    The Wood Wolverine, Dec 20, 2017
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  6. Red97

    Red97

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    The time the exhaust port is open before the transfers start to open.

    More time to clear the exhaust gasses.

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    Red97, Dec 20, 2017
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  7. J. Dirt

    J. Dirt

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    :yes:
     
    J. Dirt, Dec 20, 2017
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  8. Red97

    Red97

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    The combination of dropping the jug, added more intake duration. Didn't change the ex much. But that needed to come up anyway. The long stroke/rod ratio really worked well on the transfers.

    Would really like to get them around 120, then take em back up if needed.

    Going to put some time on as is for now.


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    Red97, Dec 20, 2017
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  9. J. Dirt

    J. Dirt

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    Well it sure looks awesome and runs even better!:thumbs:
    Is there such thing as a chainsaw dyno?
     
    J. Dirt, Dec 20, 2017
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  10. Red97

    Red97

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    Thank you.

    I have seen a couple different saw dyno's.

    Thought about making one. But was going to be pretty costly.. sure would be nice to have.



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    Red97, Dec 20, 2017
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  11. p61 western

    p61 western

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    Is there room to go more than 60% on the exhaust with the 268 piston? Nice build Joe.
     
    p61 western, Dec 20, 2017
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  12. Red97

    Red97

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    Thank you
    No, the exhaust tunnel/flange is just other 65%. The skirts would allow almost 70% just wouldn't be a exhaust flange left. Just a hole in the side of the jug lol.

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    Red97, Dec 20, 2017
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  13. p61 western

    p61 western

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    Lol so much for that idea.
     
    p61 western, Dec 20, 2017
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  14. Red97

    Red97

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    If this saw just had a normal exhaust port, I believe it would be that much better..

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    Red97, Dec 20, 2017
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  15. p61 western

    p61 western

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    For where it's at I think it's doing really good.
     
    p61 western, Dec 20, 2017
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  16. Red97

    Red97

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    Maybe I'll just have to bore/replate the cylinder to get rid of the ring at the top lol. Get it up around 78cc...

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    Red97, Dec 20, 2017
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  17. Fabz

    Fabz Banned

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    Cool beans Red 97 ... add a tuned pipe and some methanol and she’ll really throw some chips !!!
     
    Fabz, Dec 20, 2017
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  18. Red97

    Red97

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    79.8cc if it would hold 52mm... hmmm.

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    Red97, Dec 20, 2017
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  19. Red97

    Red97

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    Nah, its just a firewood saw. Sounds fun, but not very practical.

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    Red97, Dec 20, 2017
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  20. Fabz

    Fabz Banned

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    Gotcha Red97 ... nice work !
     
    Fabz, Dec 20, 2017
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