Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

IC eingine

  1. Jul 23, 2014 #1
    hi.I would like to know something about the IC engine.I just read an article.It said that 30% efficiency is gone through conduction of heat by the cylinder wall.If it is reason for one of the efficiency loss why cant we build an cylinder coated with a material that is non conduction.So only little fuel is used to ignite the spark plug.
     
  2. jcsd
  3. Jul 23, 2014 #2

    Baluncore

    User Avatar
    Science Advisor

  4. Jul 24, 2014 #3
    so what would be the efficiency of the engine if it is ceramic lined?.Does it fully keeps the heat inside the cylinder
     
  5. Jul 24, 2014 #4

    Baluncore

    User Avatar
    Science Advisor

    Ceramic could do a better thermal insulation job than a cast iron sleeve with a water jacket. But is that what is really needed? An IC engine is a very complex interconnected compromise. Unfortunately, the piston must also be kept cool.

    The durability of an engine depends on radiation of heat from the piston to the cylinder wall, along with splashing or spraying the inside of the piston with oil. It is normal for the cylinder head to have a water jacket, as does the cylinder sleeve. Only the piston has no direct cooling.

    I hate to disillusion you, but there will be no sudden new discoveries by beginners in this field, apart from the educational breakthroughs in understanding, encountered while climbing the steep learning curve.
     
  6. Jul 24, 2014 #5
    Jus to knw,is there any research undergoing regarding this?.I dnt know in what ways the efficiency is getting reduced.what are the factors?
     
  7. Jul 24, 2014 #6

    Baluncore

    User Avatar
    Science Advisor

    Research continues, but the details are very complex.
    IC engine research has been going on now for over 125 years.
    http://en.wikipedia.org/wiki/Diesel_engine

    After 90 years, the 24 hours Le mans trial continues to be run.
    http://en.wikipedia.org/wiki/24_Hours_of_Le_Mans#Engines

    Motor racing such as Formula One pushes the technology to the edge and keeps it there.
    “Commercial in confidence” research continues behind closed doors.
    Every now and then something new appears in the latest vehicles being mass produced.
     
  8. Jul 31, 2014 #7
    Aside from losing heat to the cylinder walls, heat is also lost to the exhaust gases and oil. If there was no heat lost to the cylinder walls, you could run into thermal stresses that could warp the head and block. The engine would also need a larger oil capacity to keep the oil from over heating. More oil cooling means that you've lost heat to oil instead of water and you're back to where you started.
     
  9. Jul 31, 2014 #8

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    You got it the wrong way round. The spark plug ignites the fuel. Takes surprisingly little energy to do so.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: IC eingine
  1. IC engines (Replies: 18)

  2. IC engines (Replies: 6)

  3. Doubt ic engine (Replies: 9)

Loading...