compression volume (V2)

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Equation / Last modified by KurtHeckman on 2017/05/23 16:43
`V2 = `
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KurtHeckman.compression volume (V2)
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The Cylinder Compression Volume calculator computes compression volume (V2) of the cylinder at the bottom of the stroke when the volume is at a minimum and is also known as the Clearance Volume and the Combustion Chamber volume.  The Compression Volume is a function the piston chamber volume, deck volume, compression gasket volume, dish volume, dome volume, valve relief volume, crevice volume, and chamfer volume.  chamfer.png Chamfer 
crevice.png  Crevice
gasket.png    Gasket
deck height.png    Deck Height

INSTRUCTIONS: Choose your units (default is cubic inches) and enter the following:

  • (cV) This is the chamber volume of the piston and the largest portion of the Compression Volume,
  • (dV) This is the deck volume
  • (cgV) This is the compression gasket volume
  • (dishV) This is the dish volume (usually published in the cylinder specs)
  • (domV) This is the dome volume (usually published in the cylinder specs)
  • (vrV) This is the valve relief volume
  • (crvV) This is the cylinder crevice volume
  • (chmfV) This is the cylinder chamfer volume

Compression Volume: The calculator computes the Compression Volume in cubic inches.  However, this can be automatically converted to other volume units (e.g. cubic centimeters or liters) via the pull-down menu.  Note, a piston has either a dome or a dish, not both. Also note that the crevice and chamfer volumes have a default of zero since they are often ignored

Related Combustion Engine Calculators: 

  • RATIOS AND LENGTHS:
    • Bore (diameter): Compute the Bore Diameter based on the engine displacement, number of cylinders and the stroke length.
    • Bore Stroke Ratio: Compute the Bore Stroke Ratio based on the diameter of the bore and the length of the stroke.
    • Compression Ratio: Compute the Combustion Ratio base on the minimum and maximum displacements of the cylinder at the beginning (1-Induction) and compressed (3-Power) portions of the combustion cycle (see animation)
    • Displacement Ratio: Compute the Displacement Ratio based on the volumes at the beginning and end of the stroke.
    • Rod Length Stroke Ratio: Compute the Rod and Stroke Length Ratio base on the two lengths.
    • Stroke (length): Compute the Stroke Length based on the total engine displacement, number of cylinders and the bore.
  • VOLUMES:
    • Total Engine Displacement: Compute the Total Volume (displacement) of a Combustion Engine based on the bore, stroke and number of cylinders.
    • Engine Cylinder Volume: Compute the Volume (displacement) of a Engine Cylinder based on the bore and stroke.
    • Engine Cylinder Overbore Volume: Compute the Volume (displacement) of an Engine with an Overbore based on the stroke, bore, overbore and number of cylinders.
    • Rotary Engine Equivalent Displacement: Compute the Equivalent Volume of a Rotary Engine based on the swept volume and number of pistons.
    • Gasket Volume: Compute the Volume of a Gasket based on the inner and outer diameters and the gasket's thickness.
    • Deck Volume: Compute the Volume of a Cylinder Deck based on the deck height and the bore.
    • Crevice Volume: Compute the Volume of a Cylinder Crevice based on the piston diameter, cylinder bore and the crevice height.
    • Chamfer Volume: Compute the Volume of a Cylinder Chamfer based on the cylinder diameter and the chamfer height and width.
  • SPEEDS AND RPMS:
    • Piston Speed: Piston Speed (mean) based on stroke length and RPMs.
    • Max Piston Speed: Max Piston Speed based on stroke length and RPMs
    • RPMs: RPMs based on desired piston speed and stroke length.