raym/rupinow vert hit & miss

Discussion in 'A Work In Progress' started by el gringo, Sep 17, 2019.

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  1. Sep 17, 2019 #1

    el gringo

    el gringo

    el gringo

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    will be showing progress pics as I slowly go...

    P1010648.JPG
    couldn't find my oval drillbit for the oval hole so I made a Chuck felllows carb....put a little radius on the journal end of the webs.
     
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  2. Sep 18, 2019 #2

    el gringo

    el gringo

    el gringo

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    seems like lots or counterweight but I defer to Brian's calcs
    P1010652.JPG
    Raym
     
  3. Sep 18, 2019 #3

    Brian Rupnow

    Brian Rupnow

    Brian Rupnow

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    Looking very good Ray. It is always nice to see one of my designs being built. I did email you instructions on how to make the oval hole in the main fuel rail. Not sure that you received them. The Chuck Fellows carburetor works very well on throttled engines, but is not intended for use on a hit and miss engine. I will follow your build with great interest.---Brian
     
  4. Sep 18, 2019 #4

    el gringo

    el gringo

    el gringo

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    here you go Brian, I designed and built this engine in 2016. Imade a Chuck Fellows carb for it.



    Raym
     
  5. Sep 18, 2019 #5

    el gringo

    el gringo

    el gringo

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    My humor is not appreciated.... I didn't look around too long for an oval drill bit.;););)
    Raym
     
  6. Sep 18, 2019 #6

    Brian Rupnow

    Brian Rupnow

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    Well Ray, the proof of the pudding is in the eating. Your hit and miss engine with the Chuck Fellows carb on it works great. Nice looking engine.---Brian
     
  7. Sep 26, 2019 #7

    el gringo

    el gringo

    el gringo

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    conrod
    P1010667.JPG P1010668.JPG
    I turned the crank journal .004 under so I had to size it the hard way.
    I used to blame my old Southbend 9 for mistakes until I realized I'm ten yrs older than the lathe. P1010670.JPG P1010671.JPG P1010678.JPG P1010680.JPG P1010671.JPG P1010678.JPG P1010680.JPG
    I extend the center pilot hole thru the cross hole for additional lube access

    P1010686.JPG
    tomatoes I ripped off my neighbors patch P1010687.JPG P1010690.JPG
    I GUESS NOW ITS ONTO THE 'JUG'
     
  8. Sep 26, 2019 #8

    Brian Rupnow

    Brian Rupnow

    Brian Rupnow

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    Ray--nice con-rod. I didn't turn the one on my engine, because it cleared the bottom of the cylinder okay without being turned. Since it was going to be inside the engine where nobody but me would ever see it, I just left it "full profile".---Brian
     
  9. Sep 26, 2019 #9

    werowance

    werowance

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    looking good.
     
  10. Oct 3, 2019 #10

    el gringo

    el gringo

    el gringo

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    temporary fitup P1010708.JPG
    crankshaft end play controlled by inner race of ball brg. measured <.001 ....
    BTW the conrod material is 7075 t-6 which should wear well in lieu of a proper big end brg.
    P1010711.JPG
    The jug seems to fit, now to take off and hone to size...looks like a lot of tool marks and cleanup to do on the crankcase... BTW I use 1/32 Teflon sheet for gasket material.
    Onto making piston and rings.
    Brian, how thick are the purchased rings?
    Ray M
     

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  11. Oct 3, 2019 #11

    Brian Rupnow

    Brian Rupnow

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    Ray--the purchased rings are .094" thick. When I cut the ring grooves in the piston by plunge cutting with my .094" parting off blade, the rings were too tight a fit in the grooves. I ended up putting some 600 grit aluminum oxide paste on a piece of window glass and lapping both sides of the rings so they would fit into the ring grooves freely.
     
  12. Oct 4, 2019 #12

    el gringo

    el gringo

    el gringo

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    yes, that is an important fit. I,ve heard there is more leakage there than at the gaps.
    I was not asking about the width but the radial thickness.
    ------------------------------------------------------------------------
    I just finished the final honing of the cyl. Nasty work!

    P1010700.JPG
    boring the cyl, all operations done in the 4-jaw except the internal chamfer

    P1010712.JPG

    I lost count of the fins:eek:
    Ray M
     
  13. Oct 7, 2019 #13

    el gringo

    el gringo

    el gringo

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    hi Brian,
    In making rings I use Trimbles formula for radial thickness,not more than 1/25 of cyl dia.
    I am curious as to that dimension in the store bought rings. I thought I heard you say you had a spare that could be measured.
    Ray M
     
  14. Oct 7, 2019 #14

    Brian Rupnow

    Brian Rupnow

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    Ray--I didn't measure what you are asking for on the rings, and I don't have a spare one to measure.--Wish I had. The people I bought the rings from gave me the width and depth of slot required, and that's what I put on the piston drawing.---Brian
     
  15. Oct 7, 2019 #15

    el gringo

    el gringo

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    thanks for the reply,
    What is the ring groove depth? I cant seem to find it on the piston dwg.
    Ray M
     
  16. Oct 7, 2019 #16

    Brian Rupnow

    Brian Rupnow

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    It was a trick Ray---I forgot to put it on the drawing!!---Brian
    [​IMG]
     
  17. Oct 14, 2019 #17

    el gringo

    el gringo

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    I don't have the metal for the piston yet so I STARTED CARVING ON THE FLYWHEEL ...
    P1010802.JPG
    somewhere in that cast iron a flywheel is being born.;)
     
  18. Oct 14, 2019 #18

    Brian Rupnow

    Brian Rupnow

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    Looking good, Ray. There is a world of hogging on that flywheel.---Brian
     
  19. Oct 22, 2019 #19

    el gringo

    el gringo

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    piston & flywheel...piston ring depth= .044 ring thickness = .040 less pressure on the cyl wall
    P1010804.JPG
    P1010806.JPG P1010809.JPG

    and finally the garlic patch,
    P1010807.JPG
    keeps the werewolves out of the shopo_O:D
    Ray M
     
    Last edited: Oct 22, 2019
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  20. Oct 22, 2019 #20

    el gringo

    el gringo

    el gringo

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    BTW piston material= aluminum 2024-t4
    Ray M
     

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