Cam lift

Discussion in 'The Break Room' started by Barnbikes, Jun 3, 2016.

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  1. Jun 3, 2016 #1

    Barnbikes

    Barnbikes

    Barnbikes

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    Have been looking at this engine lately. Cam looks like it should have a narrower lift on it. What is your opinion?

    [​IMG]

    [​IMG]
     
  2. Jun 3, 2016 #2

    tornitore45

    tornitore45

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    Rule of thumb calls for Valve-Lift = Valve-diameter/4
    Much less the engine chokes.
    Much more does not improve things.
     
  3. Jun 3, 2016 #3

    tornitore45

    tornitore45

    tornitore45

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    Modern studies on heat-sinks for electronic applications found that a staggered pins array was a bit better than parallel fins because it favored turbulence in the convection air currents. Looking at those cylinders it appear some old timer had figured that out long ago.
     
  4. Jun 3, 2016 #4

    Barnbikes

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    Looks like to much ramp to me. Valve will begin to open to soon and close to slow?
     
  5. Jun 4, 2016 #5

    ShopShoe

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    What do you know about that engine? Who made it? I have seen a one-cylinder vertical engine with fins like that in similar rusty and non-running condition. Some early manufacturer who couldn't sell enough, or concept died because it looked different than the rest?

    --ShopShoe
     
  6. Jun 4, 2016 #6

    Barnbikes

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    No idea who made this one. Knox cars used a single cylinder horizontal engine.

    Do you have a picture of the vertical engine?

    About 20 years ago I saw a horizontal hit and miss engine (about a 5-7 hp) that was pin cooled. Never took a picture of it though.

    I am collecting parts to build a 1/2 size engine.
     
  7. Jun 5, 2016 #7

    Jasonb

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    Its hard to see where the rocker arm pivots as that will affect how much the valve end of the arm moves relative to the cam end.

    Also as the the head of the rocker is less than the gap between the two valve heads you will need a certain amount of arm movement before the actual valve starts to open.

    J
     
  8. Jun 6, 2016 #8

    ShopShoe

    ShopShoe

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    Barnbikes,

    Sorry, I don't have a picture of that engine. It was in a flea market at an antique engine show and I was looking for something else and not interested in something like that at the time. I did look long enough to see if there was a maker's name but no such luck.

    --ShopShoe
     

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