Flat engine
In
flat engines or
boxer engines or
horizontally opposed engines the pistons lie horizontally opposed, giving them a very low
center of gravity. Some experts distinguish between
V-at-180° engines and real boxer engines. The real boxer has one crank pin per piston while in the V-at-180° engine two pistons share the same crank pin. Real boxer engines can run perfectly smooth and free of vibrations with a
four-stroke cycle, regardless of number of cylinders.
The flat configuration fits very well with air cooling. Porsche and Subaru use the design extensively in their engines today.
Related topics :
See Also
V engine, Straight engine