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Crazy cylinder/piston design idea

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    #1

    Crazy cylinder/piston design idea

    So, I got this idea while reading the stroking H22 thread. Also, it's possible something like this has been done before.

    Anyway, I was thinking about the issue of having the crankshaft and rods so long that they interfere with the deck.

    Wouldn't it be possible to remove this interference by having the bottoms of the cylinders cut at an angle, which would mean the cylinders could extend all the way down to the crank journals if they wanted, and use a piston that also extends down like that angled cut on the sides, and also use piston rings that are formed to match that contour. I can draw a diagram if needed.

    This would effectively increase the volume of the cylinder, and allow for crazy compression ratios. Does anyone have any idea what I'm saying right now?
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    #2
    Originally posted by reklipz View Post
    I can draw a diagram if needed.

    Does anyone have any idea what I'm saying right now?
    Please draw a diagram.

    From what I envision, The idea won't work (but that could be because I don't fully understand your concept)

    All I can say at this time (until I see your sketch/Diagram) is that oval pistons are proven to work, and piston rings with angles have not been proven to work in a long term effect. (assuming that is what you were meaning).


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      #3
      If the bottom of the cylinder was slotted for to allow for the rod angle to be that severe, the cylinders would be taking so much pressure that the engine doesnt last.


      This has been done in a matter of speaking. I cannot confirm exactly what you are describing has been done, exactly to the T. But, people have been boring and stroking 4 cylinder engines out to 2.5-2.6 liters for atleast two decades.

      You lose reliability in an engine with such wild rod/stroke ratio's, rod/piston angles and such excessive piston speed.


      It does work though. Thats part of Bisi's method of reaching 400+whp on an n/a f22a motor.


      I bet he tears the motor down and rebuilds atleast 3 times a season and its purely for track time only. I'd imagine he gets maybe 200 miles in between rebuilds.

      To be honest, he might tear it down after every track day. Its not that uncommon.
      Originally posted by wed3k
      im a douchebag to people and i don't even own a lambo. whats your point? we, douchbags, come in all sorts of shapes and colours.

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        #4
        Notching the bottom of the cylinders doesn't mean as a rule that sidewall pressures will increase. In some cases rod length could increase so much on the same stroke that the new angle of the higher wrist pin create the same issue. In that case, cylinder wall pressures drastically decrease. That's mostly conceptual because you would need an A-beam aluminum rod to get close to the bottom of the cylinder. That or a rod length practically unachieveable with a 219.5mm deck height.
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          #5
          Originally posted by Jarrett View Post
          Notching the bottom of the cylinders doesn't mean as a rule that sidewall pressures will increase. In some cases rod length could increase so much on the same stroke that the new angle of the higher wrist pin create the same issue. In that case, cylinder wall pressures drastically decrease. That's mostly conceptual because you would need an A-beam aluminum rod to get close to the bottom of the cylinder. That or a rod length practically unachieveable with a 219.5mm deck height.
          Yeah anything is possible, far from reasonable, but possible.
          Originally posted by wed3k
          im a douchebag to people and i don't even own a lambo. whats your point? we, douchbags, come in all sorts of shapes and colours.

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            #6
            Well, the diagram is coming, but it's going to have to be a bit. Not a priority at the moment.

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