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Engine cylinder pressure is 120 bar why you are tightening cylinder head at 1200 bar

  • Pressure = Force / Area 
  • So Force = Pressure x Area 
  • We know that Pressure = 120 bar, Lets take cylinder bore = 60 cm 
  • So area of head = ㄫ r x r = 3.14 x 30 x 30 = 2826 cm2  
  • There for Force acting on cylinder head = 120 x 2826 = 339120 Ncm  
  • In order to keep cylinder head in place we need to apply a force that is greater than 330120  
  • Now cylinder head is tighten with 8 hydraulic nuts and assume area of one nuts as 100 cm2  
  • For safety we take the force needed to keep head in place as 800000 Ncm 
  • Now There are 8 nuts so total area = 8 x 100 = 800 cm2  
  • Pressure = 800000 / 800 = 1000 bar  
    So we need to tight nuts around 1200 bar
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