Glossary “piston oiler” Definition:
Device that directs oil to the underside of the piston as an aid to carry away heat from the piston crown.
What is piston?
piston pin
Glossary “piston pin” Definition:
Round, precision ground part usually hollow, used to attach the piston to the connecting rod by press fit or held in place with internal snap rings.
piston ring
Glossary “piston ring” Definition:
A split, expandable metal ring placed around a piston to seal the space between the piston and the cylinder.
piston material
Glossary “piston material” Definition:
Material used in piston construction, usually cast- or forged-alloy aluminum.
piston head
Glossary “piston head” Definition:
That part of the piston above the rings.
piston lands
Glossary “piston lands” Definition:
Those parts of the piston between the piston rings.
piston markings
Glossary “piston markings” Definition:
Marks on a piston which are used to identify piston oversize and the front of the piston.
piston dome
Glossary “piston dome” Definition:
Shape of the piston top, which serves as the base of the combustion chamber.
piston boss
Glossary “piston boss” Definition:
That part of the piston which supports the piston pin.
piston bushing
Glossary “piston bushing” Definition:
Bushing that is pressed into the upper end of the connecting rod when free-floating pins are used.
piston collapse
Glossary “piston collapse” Definition:
Condition describing a collapse or a reduction in diameter of the piston skirt due to heat or stress.
piston crown
Glossary “piston crown” Definition:
The top of the piston. It forms the bottom of the combustion chamber.
piston displacement
Glossary “piston displacement” Definition:
Cylinder volume displacement by the piston as it travels from the bottom to the top of the cylinder during one complete stroke.
piston
Glossary “piston” Definition:
1). Engine part that reciprocates in the cylinder and transfers the force of the expanding gases via the piston pin and connecting rod to the crankshaft. 2). A round, caliper component in a disc brake that is moved outward by fluid pressure to press the pads against each rotor face. 3). An aluminum or sintered-iron component of a drum brake inside a wheel cylinder that supports the cylinder cup. 4). That part of a compressor that is driven by a crankshaft to compress vapor. 5). A small piston fitted inside a hollow cylinder which moves back and forth by fluid pressure to transmit reciprocating motion inside the transmission.