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Thread: Broken cylinder fins

  1. 03-24-2006, 05:15 PM #1
    Madsaw
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    Broken cylinder fins

    If 2 fins are broke on a cylinder how bad does affect the cooling of the saw? The 2 fins in question are the top 2 on the intake side on the flywheel side. Its just the corners broke off into the hole that goes through to access the cylinder bolts. Would this be much of concern or is this cylinder junk. This is a new cylinder.
    Thanks for the info.
    Bob
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  2. 03-24-2006, 05:20 PM #2
    RaisedByWolves
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    No big deal bob.


    Ive cleaned out some of my older saws and found one side of the cyl fins Completely full of chips/oil/gunk and they ran remarkably good in this condition.

    Didnt notice a huge difference after cleaning them either other than the saw was lighter.
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  • 03-24-2006, 05:21 PM #3
    ShoerFast
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    Quote Originally Posted by Madsaw
    If 2 fins are broke on a cylinder how bad does affect the cooling of the saw? The 2 fins in question are the top 2 on the intake side on the flywheel side. Its just the corners broke off into the hole that goes through to access the cylinder bolts. Would this be much of concern or is this cylinder junk. This is a new cylinder.
    Thanks for the info.
    Bob

    With out a picture, it's hard to say, but it may not be the end of the jug.

    Blend the fins as well as you can, run the saw just a little fatter then you usally do and if I'm wrong, you will know soon enought.

    Look at how dirty some air-cooled are run , some gain a little power.
    Kevin
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  • 03-24-2006, 05:24 PM #4
    Lakeside53
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    I'd not worry too much about it.. I don't think there's too much magic in exactly how many fins you have or not. I've seem some broken cylinders that work just fine.
    Any sufficiently advanced technology is indistinguishable from magic."
    --Arthur C. Clarke,
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  • 03-24-2006, 05:40 PM #5
    Lawn Masters
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    I would think that as long as its only 2 fins, and just a little bit of em broke off, that its no big deal. now, were it all the fins totally gone, like down to the jug, I'd be a bit concerned.
    Do you solemnly swear to sit down and shut up? No? good welcome aboard.
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  • 03-24-2006, 05:46 PM #6
    Simonizer
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    Quote Originally Posted by Madsaw
    If 2 fins are broke on a cylinder how bad does affect the cooling of the saw? The 2 fins in question are the top 2 on the intake side on the flywheel side. Its just the corners broke off into the hole that goes through to access the cylinder bolts. Would this be much of concern or is this cylinder junk. This is a new cylinder.
    Thanks for the info.
    Bob
    Not a problem. Don't worry about it. Try to keep the fins clear of debris and relatively clean though.
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  • 03-24-2006, 05:48 PM #7
    Dan Forsh
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    Interesting one this...

    I have just stripped a junker for parts and found that the cylinder, and piston, were okay, but that the top two fins were broken off on one side. I figure that these are above the cylinder's bore anyway (yes, I know heatsink) so haven't been concerned. Put them both on another saw and it runs! Haven't run it enough to see if they cause a problem yet, but I don't think it should be a cause for concern.
    Opinion is no substitute for experience.

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  • 03-24-2006, 08:04 PM #8
    Madsaw
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    And another thing I did not add is the fact I will be using it on a firewood saw on the farm. So, about the only time you have any time to cut is in the fall and winter. At that point and time of the year you are looking at lower air temps to help keep it cooler any how. After this last winter with a boiler furnace I found out It likes less then a year dried wood any how. Feed it a spring dropped fresh cut wood in the winter is best compromise in it. Had some 2 yr old stuff. Yeap just like throwing in a hand full of paper. Believe it or not I have had great luck using spring cut Box Alder mixed with oak.
    Here is a pic of the cylinder in question, it is a new set.
    Thanks all
    Bob
    Last edited by Madsaw; 12-30-2006 at 04:06 PM.
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  • 03-24-2006, 08:12 PM #9
    TimberPig
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    Bolt it on and run it. You'll never notice the small pieces of the fins that are missing when in use.
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  • 03-24-2006, 08:19 PM #10
    ShoerFast
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    Madcow

    It looks cool,,, just blend the edge of the fins to match the rest, if you want, it would help stop it from ever cracking.

    Kevin
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