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  1. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    Hi CCycle, That makes sense to me, and is something I've pondered when thinking thick vs. thin ceramic. The issue is energy absorption of the cylinder walls, as they reradiate on cooling, and the higher the temperature change, the higher the reradiation. I surmise that iron probably...
  2. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    TDIMeister, I again see a conceptual misunderstanding you have regarding the IPE: The static compression ratio from BDC to TDC is 80:1, but the IPE has a rather unconventional geometry, so I tryied to indicate the dynamic compression ratio is 20:1 and begins at 55ATC (or equivalently at 55BTC)...
  3. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    Correction: 1.4 bar of my previous post should read 0.14 bar.
  4. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    I am being a bit "figurative" and simplistic when advising the intake valve close at 55ATC, as the goal is to indicate a full atmosphere of air at 1/4 stroke past TDC. I will review a way to word this more correctly, as I wish my paper to be understood reasonably during an abbreviated...
  5. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    Thanks Carnage1, Note that my target 4000rpm redline is simply an intuitive guestimate, as are all my numbers at this stage. Redline may be as low as 2000rpm or as high as 6000rpm. Better understanding of flame properties and inertial limits will define much of this. The 17ATC notation is...
  6. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    Hi again TDIMeister, In your final paragraph you mentioned a concern regarding "expanding the burned gas past below atmospheric pressure at EVO", but this is another misunderstanding. I will review my paper to find the logical source of the misunderstandings, and will rewrite it to help assure...
  7. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    Thanks, I needed that. I look at good science more as an art than a rigor. It is so much fun to bang heads with others, as we all have our scientific strengths and together we can design stuff that cannot be conceived by one person alone. To be sure, this thread has provided a great deal of...
  8. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    I've been reviewing my Thermodynamics book since last posting, and it is more understandable than the last time I reviewed it, but it remains way over my head. I've now realized I am not yet able to step away from my split-loss approach, but I can stuff a bit more science behind my claim of how...
  9. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    Hi TDIMeister, Thanks for your response. You have math and calculation abilities which I can only seek to learn. I will work to understand the numbers and formulas you provide. I would certainly not describe Brian's or your viewpoints as "harsh", as they both challenge the IPE concept using...
  10. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    Thanks again for responding. The cam ramp has much to do with the cam size. A larger diameter cam circle (larger hollow cam), combined with appropriately sized cam followers, can handle more exotic ramps. This is a simple mechanical exercise which I've only intuitively considered the details...
  11. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    Oh, by the way, I have found some cool discussions on ceramic engines archived in this forum, and expect to spend a good bit of time reviewing them over the next few days. Shoe.
  12. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    Hi Brian, I definitely seek and appreciate criticism. It need not be polite, as a jarring critique will often speed the learning process. My Insulated Pulse Engine (IPE) concept does not represent any currently constructed engine. I am presenting it as a tool to help me learn more, and...
  13. DaveShoe

    Are adiabatic/ceramic engine concepts being researched nowadays?

    I understand that ceramic "adiabatic" engines were popular research and development topics in the 1980s. The 1979 oil crisis brought the ideas into vogue, and major engine manufacturers around the world were constructing and testing conceptual ceramic engines that required no cooling system. I...

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