INDICATOR DIAGRAM

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 indicator diagram

  •  At the same time it will indicate pressure and the position of piston.


Purpose:

  • To indicate the power developed in the system (cylinder).
  • To indicate the pressure maximum (Pmax) and compression pressure
  • To find the exhaust and scavenging condition
  • To evaluate the combustion process.

 
Types of indictor diagram.

  • Draw card 
  • Power card
  • Compression card
  • Light spring diagram


DRAW CARD 
 

  • Its used to find the Pmax & Pcom accurately
  • With this draw card we can find the ignition delay,fuel pump timing and after burning and the loss of compression.
  • Its 90° out off phase with piston movement.


POWER CARD



  • Its used to find the indictor power.
  • And to find the peak pressure and compression pressure.
  • Its in-phase with piston with fuel on.
  • It can be find by planimeter.

COMPRESSION CARD


  • Its used to find the compression pressure.
  • Ans the cylinder thickness.
  • Its in-phase cut off fuel and reduce rpm.

LIGHT SPRING DIAGRAM


  • Its used to find the pressure variation in the cylinder. With respect to scavenge and exhaust manifold.
  • It is in-phase with light spring in fuel on .
  • It will show the chocks in scavenge manifold and exhaust valve chocks and less air.

SURVIVER MAY ASK

Why is not possible to take power card in 4-stroke engine?

  • 4 stroke piston moves 2 times to TDC in one cycle. So we can't able to take.

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