Here's why some engines use this configuration:
* Low Center of Gravity: The horizontal pistons contribute to a lower center of gravity compared to traditional V-engines or inline engines, making the car more stable, especially during cornering.
* Smooth Operation: The pistons move in opposing directions, creating a smoother and more balanced engine operation with fewer vibrations.
* Compact Design: The flat layout allows for a shorter engine length, enabling a lower hood line in cars, which improves aerodynamics.
* Less Internal Friction: The horizontal motion reduces the friction between the pistons and cylinder walls.
Common Examples of Opposed-Piston Engines:
* Subaru: Famous for their "boxer" engines.
* Porsche: Used in some of their sports cars, like the 911.
* Volkswagen: Used in some of their smaller cars and SUVs.
However, there are also some disadvantages to horizontal pistons:
* More Complex Design: The opposing piston design requires a more intricate crankshaft and connecting rod system, which can increase complexity and maintenance costs.
* Limited Power Output: Due to the inherent design constraints, horizontal piston engines typically have a lower power output compared to V-engines or inline engines with similar displacement.
* Higher Cost: The intricate design and specialized parts often lead to a higher manufacturing cost compared to more conventional engine layouts.
In conclusion, horizontal piston engines are a unique design that offers advantages in terms of smoothness, stability, and compact design. However, their complexity and limitations in power output and cost are factors to consider.
