Blowdown

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Blowdown is the number of degrees between the opening of the exhaust port and the opening of the transfer ports. Blowdown can be calculated by using this formula

B=(T-E)/2

Where

  • B=Blowdown (in degrees)
  • T=Transfer timing (in degrees)
  • E=Exhaust timing (in degrees)

See calculating timing for explanation of different blowdown usages.