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| SOURCES |
| Total Seal Piston Ring Division
Dept. DRO
22642 North 15th Avenue
Phoenix, AZ 85027
PH: 623-587-7400
www.totalseal.com |
Ring Terminology
• Ring Land: The part of the piston
between the ring grooves and above the top ring that confines
and supports the piston rings.
• Heat Dam: A narrow groove in the
top land used in some pistons to help control heat getting
to the top ring. It actually fills with carbon in normal operation
and limits heat flow to the ring.
• Ring Belt: The area on the piston
between the top of the pin bore and the top of the piston
where the ring grooves are machined.
• Groove Depth: The distance between
the back of the ring groove and the cylinder wall with the
piston centered.
• Groove Root Diameter: Piston diameter measured
at the back of the groove. May vary on the same piston between
ring grooves.
• Land Diameter: Diameter of a given
land. Can sometimes vary by design from top to bottom.
• Land clearance: The difference in
diameter between the cylinder bore and the land diameter.
"R" is 1/2 the total.
• Groove Spacer: Used on re-grooved
pistons to return a ring groove to specs or in some performance
applications to facilitate the use of narrower ring sets than
the grooves were originally cut for.
• Free gap: The ring end clearance
when the ring is uncompressed.
• Compressed gap: Also known as ring
gap, it is the end gap measured when the ring is installed.
• Radial Wall Thickness: the distance
between the inside and outside faces of the ring wall.
• Ring Diameter: Measured with the ring installed.
• Inside Diameter: Measured with the
ring installed.
• Ring Sides: The top and bottom surfaces
of the ring.
• Ring Face: The part of the ring in
contact with the cylinder wall.
• Side Clearance: Clearance between
the ring groove and the ring.
• Torsional Twist: A built-in imbalance
between the way the upper and lower sides compress that causes
a twist in the ring when compressed. Used to seal both the
ring in the groove and the ring to the cylinder wall.
• Back Clearance: Distance between the inside
diameter of the ring and the bottom of the ring groove with
the ring installed.
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