Internal combustion engine

A piston arrangement for an internal combustion engine, the piston arrangement comprising:

• a plurality of pistons,
• wherein the pistons are arranged in an opposed configuration,
• wherein a piston crown of one or more of said pistons is wholly constructed from a technical ceramic material,
• wherein the pistons each comprise a piston rod, and
• wherein the piston rod of at least one of the pistons comprises an axially disposed bore formed therein and a heat transfer member is configured for location in the bore of the piston rod, wherein the heat transfer member is reconfigurable from a first, solid, state to a second state in which at least part of the heat transfer member is in a liquid state, the heat transfer member in said second state being movable relative to the bore of the piston rod so as to transfer heat away from and thus cool the piston rod as the piston reciprocates.

A piston arrangement for an internal combustion engine, the piston arrangement comprising:

• a plurality of pistons,
• wherein the pistons are arranged in an opposed configuration,
• wherein a piston crown of one or more of said pistons is wholly constructed from a technical ceramic material,
• wherein the pistons each comprise a piston rod, and
• wherein the piston rod of at least one of the pistons comprises:
• a pushrod portion;
• and
• a wedge portion,
• wherein the wedge portion of the piston rod comprises a plurality of segments.

An internal combustion engine comprising:

• a piston and cylinder arrangement, the piston and cylinder arrangement comprising:
• a piston arrangement comprising:
• a plurality of pistons, wherein the pistons are arranged in an opposed configuration, and wherein a piston crown of one or more of said pistons is wholly constructed from a technical ceramic material;
• a cylinder arrangement comprising cylinders for receiving the pistons;
• and
• a cooling arrangement for a fuel injection arrangement of the internal combustion engine,
• wherein the cooling arrangement comprises one or more heat pipes, and
• wherein at least one of:
• one or more of the heat pipes are coupled to or operatively associated with a heat sink;
• one of the heat pipes comprises:
• an envelope;
• a saturated working fluid;
• and a wick.