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"Warm Saw" Stihl 024/034 mess of parts!

Discussion in 'Modded Hot Saws' started by weeks auto, Dec 31, 2018.

  1. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals)

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    You can definitely run the top ring only.

    @blsnelling used to do on purpose in his ported saws with no ill effect.

    I've done it on some saws, like the stihl 361, to get a wider exhaust port. It doesn't do anything bad at all to a Saw.
     
    Last edited: Jan 4, 2019
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  2. weeks auto

    weeks auto Super OPE Member

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    That’s good news. A 4 gr. difference shouldn’t matter since am to oem had a 3 gram difference. Now I just have to figure the rest out. This is fun!
     
  3. weeks auto

    weeks auto Super OPE Member

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    I took 2mm off the base and another 1.5mm off the bottom of the piston and it put my numbers at 97 118 76. and I got the piston lighten to 4 grams heavier then the 024 piston with only the top ring. While lowering the cyl 2mm I had to do a little more grinding to clear the flywheel but not as much as I expected. Hopefully monday the aluminum for the head and my long studs show up then I can really get moving on this. I am getting excited to hear this thing run (if it runs).
     
  4. weeks auto

    weeks auto Super OPE Member

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    I got the head materials and the hardware today now I just have to ruin some aluminum. Also I got a 029 intake mocked in there and after I drilled the 024 intake hole out to an inch it fits like it was made for it. I also threw in some pics of the basecut and piston lightening work from this weekend. I picked up cheap lathe this weekend ( a HF 7 x 10 mini lathe with tooling) and it looks brand new. I will probably sell it, but it came with some nice boring bars and a really sweet inside radius turner which I will post pics when I finally get it home. Forgot to load it up at my folks last night before we came home. I don't need the lathe home but the inside radius turner would fit my southbend nicely and help me on the chamber for this head. Oh well I can get started on the head and finish it next weekend after I pick it up.
    [​IMG] [​IMG]
    [​IMG] [​IMG] [​IMG] [​IMG] [​IMG]
    [​IMG]
     
    Last edited: Jan 7, 2019
  5. weeks auto

    weeks auto Super OPE Member

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    Got started on the head this evening. Could not find my spark plug tap so I’ll have to grab one tomorrow and hopefully finish the head this week.
    [​IMG]
     
    Last edited: Jan 7, 2019
  6. mdavlee

    mdavlee Hillbilly grinder

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    How many cc is the chamber?
     
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  7. weeks auto

    weeks auto Super OPE Member

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    I have not checked the cc's on it yet. It is not to final dimensions yet since I have not finalized the squish band depth.
     
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  8. blacksmith

    blacksmith Super OPE Member

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    Very interesting build as many others have said! Looking forward to see a video of this Frankenstein in some wood!
     
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  9. Sty57

    Sty57 Jon1212 Approved!

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    You going to cut the top of the jug for a O-Ring?
     
  10. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals)

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    Chamber looks big for saw.

    Easy way to check is to put plug in, cover band with packing tape, inject water with 1cc syringe and needle and keep track.

    @mdavlee , is ROT 1cc per 10cc for 200psi?
     
  11. weeks auto

    weeks auto Super OPE Member

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    I was just going to lap the head to the cylinder and try it. If there is an issue I will try a seal of some sort.
     
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  12. weeks auto

    weeks auto Super OPE Member

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    I will check it. I tried to make it a little smaller then the 034 Chamber. I can always take a little off of the bottom of the head and reshape the chamber. I am shooting from the hip on this project if you can't tell , haha hoping I end up with something that runs and learning a lot. I appreciate all the comments and suggestions.
     
  13. Wonkydonkey

    Wonkydonkey Pinnacle OPE Member

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    Very interesting this... it defo took a twist that I did not see coming. I'm subbed

    Btw. Love to see the final product and vids :campeon:

    Cheers
     
  14. weeks auto

    weeks auto Super OPE Member

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    Thanks for the encouragement
     
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  15. mdavlee

    mdavlee Hillbilly grinder

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    That gets you close anyway. The plug takes up some plus the squish band area is added to the chamber size as well. On smaller heads a little ultra copper or even nothing will usually seal if torqued. The viton I had will melt and needs replaced every time you take the head off. If I were to do it again I’d use copper wire and make fire rings to sit in the groove.
     
  16. Magic_Man

    Magic_Man Oh Yea !

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    Cool build
     
  17. weeks auto

    weeks auto Super OPE Member

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    I had a productive day today. I got the head machining done and cc'ed and it came out to 3.5cc plus the squish area which is .030" right now. Then I got the mounting hole done which required me to build a drilling attachment for the lathe, it was real handy. Then I did a mock-up assembly and modified the cover to fit over the big head and cut a hole for the plug and boot to stick through I also installed a stud in the head to use the original top cover hold down. I had to swap a longer plug wire on the 024 coil. I also mocked up the muffle and it should not take much massaging the get it to bolt on and seal.

    Now I have to disassemble everything and clean it real good, install new gaskets and seals, modify the carb and linkage, finish the muffler, do some port work, and re-assemble. I also need to lap the head to the cylinder but I wanna get my compression to where I want it before that.
    [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG]
     
  18. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals)

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    Very nicely done!

    Any pics of the Drill fixture you made? I’d love to see it.

    3.5 cc on a 50cc saw should give you healthy compression. Did you add some sealant for your comp check?
     
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  19. weeks auto

    weeks auto Super OPE Member

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    I didn’t add any sealant. I am gonna seal the base with a thin layer of motoseal and I am going to try and seal the head to the cylinder by lapping them and no sealant or o ring. I am going to get it running and check comp, then if it is too low I will take some material off the head.
     
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  20. weeks auto

    weeks auto Super OPE Member

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    Ill try and get a pic of the drill fixture today.
     
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