Another Edwards built.

Discussion in 'General Engine Discussion' started by Glorfindel, Jan 17, 2019.

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  1. Jan 17, 2019 #1

    Glorfindel

    Glorfindel

    Glorfindel

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    Hi guys. It's my first built. I'm mostly doing it by the plan, but i adapted some parts to my machining capacity.

    Im using a DMG DMU50 (5 axis mill), DMG 1250CTX (mill/turn) and a 4 axis wire EDM and a 3d printer ( mockup purpose)

    Here are the parts i made so far:



    1547574941214~2.jpeg 20190111_105520.jpeg 20190111_145037.jpeg
     
  2. Jan 17, 2019 #2

    Glorfindel

    Glorfindel

    Glorfindel

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    Did those parts today

    Everything went good. Still not sure why the carbs is offset center tho.

    I tought that it was about "centering" the carbs vs the 2 longer intakes tubes, but if that was the goal, it can be better than that. 20190117_162745.jpeg
     
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  3. Jan 18, 2019 #3

    petertha

    petertha

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    Nice parts.
    I'd like to see some details of your cylinder liner one day. Is the one in the picture 'prototype' (as I like to call my first knock offs :) ). Are you grinding bores or lapping or...?
    Did you decide you will proceed with the original design lubrication pump?
     
  4. Jan 18, 2019 #4

    Glorfindel

    Glorfindel

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    Yes, i usually do a couples of "prototypes" before the final ones ;-)

    I did the liners on the 1250ctx. So i did the outside diameters in lathe mode, and i did the bore with a Udrill and the finishing with a boring bar.

    I left some little material for manual honing with cross pattern.
     
  5. Jan 18, 2019 #5

    Glorfindel

    Glorfindel

    Glorfindel

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    Did the rocker brackets today. It take exactly 4:00 min to do one, about 1.5 hours of programation. 20190118_160111.jpeg
     
  6. Jan 21, 2019 #6

    Glorfindel

    Glorfindel

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    Did the pistons today. I changed the ring groove to 1mm( 0.039") instead of 0.0325" because i already had the 1mm grooving tool, so i adjusted the pattern.

    I will make the ring 0.008" thicker. 20190121_174709.jpeg 20190121_174056.jpeg
     
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  7. Jan 28, 2019 #7

    Glorfindel

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    Did some changes on the rockers. 20190125_092537.jpeg 20190125_092503.jpeg 20190128_163218.jpeg
     
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  8. Jan 28, 2019 #8

    tornitore45

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    If I understand the post and pictures you did a stress analysis of the part as designed and of a new design and concluded your much simpler new design is sufficiently strong. Right?
     
  9. Jan 28, 2019 #9

    Glorfindel

    Glorfindel

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    Yes sir. Same weight, same strengh, just a different design adapted to my tooling/cnc.
     
  10. Jan 29, 2019 #10

    petertha

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    Neat! Just curious, is the program showing stress of the threads for the screwed in rocker button & valve adjustment screw or that is just omitted for simplicity?

    Most all of the (commercial RC) 4-strokes I've seen have hardened steel rockers, but I guess one big reason is one end is acting directly on the valve. Whereas the Edwards uses 7075 and has steel thread-ins for both contact parts.
     

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  11. Jan 29, 2019 #11

    Glorfindel

    Glorfindel

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    Yes, it's a simplified analysys. I guessed that the threads are not the weak point.

    There is place for "optimizing" some of the parts and crush some numbers. Lots of fun ahead of me.

    I want to also make a small dyno to record everything and compare designs.
     
  12. Jan 30, 2019 #12

    Glorfindel

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  13. Jan 31, 2019 #13

    editor123

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    One thing to be careful of is when you increase the height of the ring, you can significantly increase friction. Have you read the Trimble ring article in Strictly IC? StrictlyIC.com if you don't have the article. The only caveat in the article is that he uses too high a temperature to set the rings. 1100 degrees F for one hour is better.
     
  14. Jan 31, 2019 #14

    tornitore45

    tornitore45

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    There is not a lot of room between the wrist pin and the piston top to pack 2 rings and one scraper.
     
  15. Jan 31, 2019 #15

    editor123

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    An oil control ring will work below the Wrist Pin.
     
  16. Jan 31, 2019 #16

    Glorfindel

    Glorfindel

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    Thx, i'll take a look at the article.
     
  17. Jan 31, 2019 #17

    Glorfindel

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    Hummm food for thought.
     
  18. Feb 1, 2019 #18

    tornitore45

    tornitore45

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    There is where I plan to put mine. But the bore on the piston bottom (no diameter dimension) 0.30 deep need to be stopped early, like to a 0.20 depth to leave enough metal.
     
  19. Feb 6, 2019 #19

    Glorfindel

    Glorfindel

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    Should cut the CamRing today. 20190206_103133.jpeg
     
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  20. Feb 6, 2019 #20

    Glorfindel

    Glorfindel

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    First side done, but i'll make another one, the material was harder than expected, i will corect some speed and feed next time. 20190206_155748.jpeg
     

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