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-   -   Relation between cubic capacity and volumetric efficiency, (https://www.askmehelpdesk.com/showthread.php?t=299465)

  • Jan 5, 2009, 01:24 PM
    ashish_sinha
    Relation between cubic capacity and volumetric efficiency,
    Relation between cubic capacity and volumetric efficiency in internal combustion engine??
  • Jan 19, 2009, 06:17 AM
    shatriya
    Volumetric efficiency is a ratio (or percentage) of what volume of fuel and air actually enters the cylinder during induction to the actual capacity of the cylinder under static conditions.

    Cubic capacity of the engine is internal size of the engine. In other words, it is the volume between the TDC (top dead center) and BDC (bottom dead center) of the engine.
    That's why you can see the specifications on the engine as 2000cc or 1800cc, where cc is cubic centimeters or you can say cubic capacity. 2000cc can also be written as 2.0 liters engine.
  • Jan 19, 2009, 01:40 PM
    ashish_sinha
    Quote:
    Originally Posted by shatriya View Post
    Volumetric efficiency is a ratio (or percentage) of what volume of fuel and air actually enters the cylinder during induction to the actual capacity of the cylinder under static conditions.

    Cubic capacity of the engine is internal size of the engine. In other words, it is the volume between the TDC (top dead center) and BDC (bottom dead center) of the engine.
    That's why you can see the specifications on the engine as 2000cc or 1800cc, where cc is cubic centimeters or you can say cubic capacity. 2000cc can also be written as 2.0 liters engine.
    U really not understand the question,,
    Tell me is there any direct relation between volumetric efficiency and C.C??
  • Jan 19, 2009, 11:04 PM
    shatriya
    Quote:
    Originally Posted by ashish_sinha View Post
    U really not understand the question,,,,,,,,,,,,,,,,
    tell me is there any direct relation between volumetric efficiency and C.C?????????
    Check out the definition of the Volumetric efficiency that I've given.
    It says that it is inversely proportional to the capacity of the cylinder that is cubic capacity.
  • Jan 20, 2009, 10:12 PM
    ashish_sinha
    Quote:
    Originally Posted by shatriya View Post
    Check out the definition of the Volumetric efficiency that I've given.
    It says that it is inversely proportional to the capacity of the cylinder that is cubic capacity.
    U mean that maruti 800 has more volumetric efficiency than honda accord 1800cc because of it has smaller cylinder volume,, that is not true
    My dear just think what you are interprating
    If you know just give me any mathemical relation b/w them if you know,,
  • Jan 21, 2009, 01:13 AM
    shatriya
    Quote:
    Originally Posted by ashish_sinha View Post
    u mean that maruti 800 has more volumetric efficiency than honda accord 1800cc because of it has smaller cylinder volume,,,,,,,,,, that is not true
    my dear just think what u r interprating
    if u know just give me any mathemical relation b/w them if u know,,,,,,,,,
    As per the definition,
    Volumetric efficiency (VE) is a ratio (or percentage) of what volume of fuel and air (VAF) actually enters the cylinder during induction to the actual capacity(AC) of the cylinder under static conditions.

    Here by,
    VE = VAF/AC %
    If the VAF is kept constant, then surely maruti 800 will have better volumetric efficiency then honda accord 1.8 lt.
    But, this is not the case brother. To maintain or increase the amount of fuel entering in the cylinder (VAF), the changes are made in the induction system of the engine. That's why, practically, maruti 800 cannot have better volumetric efficiency than honda accord 1.8 lt.
    Either the size of the inlet valve is increased or the number of valves are increased per cylinder so as to allow more charge to enter into the cylinder.
    I think you might have heard that santro has 16 valve engine. Its just that there are 2 valves for charge inlet and 2 valves for exhaust gas outlet per cylinder. Moreover, the size of the inlet valve will be more than that of the outlet valve. This is all done to increase the volumetric efficiency of the engine.
    Hope I'm pretty much able to clear your doubts this time.
  • Jan 21, 2009, 12:29 PM
    ashish_sinha
    Quote:
    Originally Posted by shatriya View Post
    As per the definition,
    Volumetric efficiency (VE) is a ratio (or percentage) of what volume of fuel and air (VAF) actually enters the cylinder during induction to the actual capacity(AC) of the cylinder under static conditions.

    Here by,
    VE = VAF/AC %
    If the VAF is kept constant, then surely maruti 800 will have better volumetric efficiency then honda accord 1.8 lt.
    But, this is not the case brother. To maintain or increase the amount of fuel entering in the cylinder (VAF), the changes are made in the induction system of the engine. That's why, practically, maruti 800 cannot have better volumetric efficiency than honda accord 1.8 lt.
    Either the size of the inlet valve is increased or the number of valves are increased per cylinder so as to allow more charge to enter into the cylinder.
    I think you might have heard that santro has 16 valve engine. Its just that there are 2 valves for charge inlet and 2 valves for exhaust gas outlet per cylinder. Moreover, the size of the inlet valve will be more than that of the outlet valve. This is all done to increase the volumetric efficiency of the engine.
    Hope I'm pretty much able to clear your doubts this time.



    Now you are clear,,
    Thanks,,
  • Jan 22, 2009, 12:27 AM
    shatriya
    Quote:
    Originally Posted by ashish_sinha View Post
    now u r clear,,,,,,,,,,,,,,,
    thanks,,,,,,,,,,,
    Rate my answer if you like.

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