raym/rupinow vert hit & miss

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

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  1. Oct 25, 2019 #21

    el gringo

    el gringo

    el gringo

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    I was looking at the "weight" drawing and it is difficult for me to discern the actual lines of the part from the dimensional lines... is it possible to ask the computer to define the lines of one or the other on the drawing ?
    Ray M
     

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  2. Oct 25, 2019 #22

    Brian Rupnow

    Brian Rupnow

    Brian Rupnow

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    Ray--Maybe this will help.---Brian
    [​IMG]
     
  3. Oct 26, 2019 #23

    el gringo

    el gringo

    el gringo

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    Thanks!
    Ray M
     
  4. Oct 26, 2019 #24

    el gringo

    el gringo

    el gringo

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    Hi Brian,

    There is a .063 hole in the cyl head and a matching one in the upper bracket, what are they for?
    RAy M
     
  5. Oct 27, 2019 #25

    Brian Rupnow

    Brian Rupnow

    Brian Rupnow

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    They were in there mainly for set-up. I put an 0.063" pin in there to hold everything in correct alignment before I drilled the holes in the bracket and cylinder. The hole really doesn't have anything to do with the function of the engine.--Brian
     
  6. Oct 27, 2019 #26

    el gringo

    el gringo

    el gringo

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    good idea!! I'll do that when I get there.
    Ray M
     
  7. Oct 31, 2019 #27

    el gringo

    el gringo

    el gringo

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    upper bracket... kind of a tetchy part for me to make.


    P1010813.JPG
    in a vise on the mill

    P1010818.JPG
    in the vise on the mill... the vise turned 30degrees on the mill bed to pick up the angles
    P1010820.JPG
    in the rotary table on the mill

    P1010822.JPG
    please holler if any questions
    Ray M
     
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  8. Oct 31, 2019 #28

    Brian Rupnow

    Brian Rupnow

    Brian Rupnow

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    Good looking parts Ray. That bracket is a good example of something made for "pretty". It could have been a lot simpler, but it wouldn't have looked nearly as nice.---Brian
     
  9. Nov 1, 2019 #29

    el gringo

    el gringo

    el gringo

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    yes, truly a case where form doesn't follow function. I suppose the question of form and /or function must have come up often for a design engineer due to possible cost
    implications.
    One of my favorite examples of a 'form and function' design is my old Southbend 9 inch model 'a' lathe.
    Ray M
     
  10. Nov 8, 2019 #30

    el gringo

    el gringo

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    cylinder head
    P1010824.JPG
    P1010835.JPG P1010849.JPG parting off a valve cage
    P1010843.JPG
    P1010846.JPG
    P1010853.JPG
    P1020846.JPG
    an old photo showing how I used VSR to grind in the valves to the cage...
    Ray M
     

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    Last edited: Nov 8, 2019
  11. Nov 8, 2019 #31

    Johno1958

    Johno1958

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    Your making some good progress Ray. I also when I get to it:rolleyes: am going to have a go at making the rings which I have never done .
    I have been saving a little bit of cast iron I have left over from another job that I got from Germany for making some rings as it seems
    a better quality than what I have sourced locally of ebay.
    Cheers
    John
     
  12. Nov 9, 2019 #32

    el gringo

    el gringo

    el gringo

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    I think I will make rings next... will try to Make a somewhat detailed show and tell as to the way I make them... I use some of these instructions as a help.
    http://jerry-howell.com/PistonRings.html
    TWIN_PA2.JPG
    I usually slice off more'n I need "allow for breakage"

    Ray M
     
  13. Nov 9, 2019 #33

    Johno1958

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    Good stuff. I'll be watching
    John
     
  14. Nov 18, 2019 at 8:15 PM #34

    el gringo

    el gringo

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    Looks like I have ~ 4.72:1 Compression Ratio with >.032 gaskets @ top and bottom of cyl. Am wondering how that compares with the original?
    Looks like I can increase to ~5.5:1 by using .010 and .016 thick gaskets top and bottom...Also wondering what would be minimum CR for this engine to run properly?:rolleyes:

    Ray M
     
  15. Nov 18, 2019 at 9:33 PM #35

    Brian Rupnow

    Brian Rupnow

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    Ray--I used .031" thick gasket under the cylinder and under the cylinder head. Engine ran just fine with that. I am not sure what you mean by minimum CR. I don't know what CR is.---Brian
     
  16. Nov 18, 2019 at 10:40 PM #36

    el gringo

    el gringo

    el gringo

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    Sorry Brian, here is a definition...
    https://en.wikipedia.org/wiki/Compression_ratio

    Do you have a feel for what the compression ratio is on your engine, possibly in your design notes?, or by checking the distance from top of piston @ TDC to cylinder deck with your computer aided design criteria or direct measurement?
    Can anyone suggest a low end Compression Ratio on this type of engine?
    I am wondering if I have made a mistake in dimensions and should possibly re-make some parts before continuing... looks like I can increase the CR to ~5.5:1 by decreasing gasket thickness to .o12 if need be.
    Thanks
    Ray M
     

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