# chamfer volume

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The Chamfer Volume calculator computes the volume (cfV) of a chamfer (see diagram)                        chamfer like that found in a combustion engine cylinder.

INSTRUCTIONS:  Choose units and enter the following:

• (d) inner diameter
• (c) the width
• (h) the depth

Volume of a Chamfer (V): The calculator returns the volume in cubic millimeters (mm3).  However, this can be automatically converted to compatible units via the pull-down menu.

## Piston Chamfer

A piston chamfer is the bevel cut into the top of the block around the piston bore.  It allows the rings to be more easily inserted in the cylinder.

Some engine manuals calculate the chamfer volume differently.  They take the difference of the diameters (bore and piston), multiply that difference by the circumference of the bore to create the surface area of the chamfer and then multiply that surface area by the depth of the chamfer to get twice the volume.  The author disagrees with those manuals, because they are geometrically wrong (just like the piston crevice formula). Without the piston bore, the bevel is an upside-down frustum of a cone.  To get the chamfer volume, you calculate the volume of that cone frustum, and then remove (subtract) the volume of the cylinder that would be in that frustum.  This equation does that.

 Inch Equivalences Fraction Decimal Mils 1/16th 0.0625 62.5 1/32th 0.03125 31.25 1/64th 0.015625 15.625

#### Related Math

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