One of the key elements of the 1NR-FE engine is its piston design.

The original Napier Culverin was an opposed piston design.

All Junkers diesel engines were two stroke, opposed piston designs, an arrangement he invented in the early 1890s.

This is accomplished through a piston design, rather than a spinning cam.

Several revolutionary improvements were achieved in this design, such as a new piston design and combustion process.

The brakes are all two piston design.

All calipers are of four piston design.

Like the HK416, the HK417 is a gas-operated, with a short-stroke piston design similar to those found G36.

All Atomic first stages are flow-through piston designs.

The H&K's design replaces the direct impingement gas system with a newer piston design.