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Epoxy in the intake? Ms660

Discussion in 'Sub-forum for these Rice Burner 660 builds' started by Golddredger, Mar 3, 2018.

  1. Golddredger

    Golddredger Well-Known OPE Member

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    Hey fellas,
    Keeping seeing in the 660 build threads guys saying they have epoxied the intake. I looked through cant really find any good pictures of this and or why its being done? Can you guys post some pictures and explain why you are doing it? Thanks!
     
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  2. huskihl

    huskihl Sausage Fingers Forever

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    MS660's are known to have too much exhaust duration. They seem to run better with the exhaust opening down around 100° after tdc. Stock, they vary from about 93 to 98°. In order to get the exhaust port physically lower, the base gets cut on a lathe. This also makes the intake lower. Sometimes too low for good performance. Many consider an 80° intake opening to be about right, but most of the Farmertec cylinders have the intake down around 86. After machining, they get close to 89°, which isn't optimal. Filling the bottom of the intake port with epoxy allows you to grind it down to a more preferred opening height
     
  3. Golddredger

    Golddredger Well-Known OPE Member

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    Awesome thanks!
     
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  4. Deets066

    Deets066 AKA Deetsey

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  5. Golddredger

    Golddredger Well-Known OPE Member

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  6. Deets066

    Deets066 AKA Deetsey

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    Port prep is big, definitely wash and degrease cylinder. I like to grind in a few dimples on the floor. Then bead blast
     
  7. SixGun

    SixGun Super OPE Member

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    Thanks for the pics Deetsy!
    What epoxy do you use ?
    Thanks
     
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  8. huskihl

    huskihl Sausage Fingers Forever

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    Regular old jb weld
     
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  9. SixGun

    SixGun Super OPE Member

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    Cool, thanks ! I heard some guys were using aluminum reinforced stuff.
    Doing a couple 660's now and they will need it. Pushing 85* before cutting base.
     
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  10. huskihl

    huskihl Sausage Fingers Forever

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    Yeah there's fancy stuff out there if you want to pay for it. I've never had jb fail in an intake if the surface is clean with a burr finish. If it did fail, it turns to a soft powder and I don't believe it would cause damage
     
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  11. mdavlee

    mdavlee Hillbilly grinder

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    Devcon works great. But the cost is outrageous compared to a small JB weld tubes from Lowe’s.
     
  12. redlight066

    redlight066 Pinnacle OPE Member

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    It's worth the extra effort. This was for a tree service and would have a 36" bar dedicated to it. @Deets066 had a thread on Another Site if I remember correctly. This saw is a beast
     
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  13. redlight066

    redlight066 Pinnacle OPE Member

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  14. redlight066

    redlight066 Pinnacle OPE Member

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    Surface prep (rough with a couple of dimples) and JB. This brought the intake up to 80-81
     
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  15. SixGun

    SixGun Super OPE Member

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    Thanks for great info guys. I've been out of the saw game for a bit and never did a full port job on a 660, I usually just did the basics DP Muff, Ign advance, pull limiters.
     
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