CROSSPLANE Meaning and
Definition
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Crossplane is a term commonly used in the context of engines, specifically referring to the arrangement of a crankshaft's main journals. In a crossplane engine, the crankshaft is designed in such a way that the individual throws, or crankpins, are evenly spaced at 90-degree intervals. This results in the crankshaft resembling a cross when viewed from the front or rear.
The principal characteristic of a crossplane engine is the firing order of its cylinders. In a V8 crossplane engine, for example, the cylinder banks are oriented at a 90-degree angle to each other. This configuration ensures that only one cylinder from each bank fires during each 90-degree rotation of the crankshaft. As a result, the engine produces a unique firing sequence, often described as a "crossplane" pattern.
The crossplane design offers several advantages. It tends to provide improved balance compared to other crankshaft arrangements, reducing vibration and enhancing engine smoothness. This is particularly desirable in high-performance and luxury vehicles where a smooth and refined power delivery is sought. Additionally, the firing order of a crossplane engine can contribute to a distinct exhaust note, often characterized by a deep rumble, which is highly regarded by automotive enthusiasts.
In summary, a crossplane engine is an internal combustion engine in which the crankshaft has evenly spaced crankpins, resulting in a firing order that provides improved balance, reduced vibration, and a unique exhaust note.
Etymology of CROSSPLANE
The word "crossplane" is derived from two separate components: "cross" and "plane".
"Cross" refers to something that intersects or crosses over something else at a right angle or diagonally, forming a shape of a cross. This term is derived from the Old English word "cros", which originated from the Latin word "crux", meaning "cross".
"Plane" refers to a flat or level surface. This term originated from the Latin word "planus", which means "flat" or "even".
When combined, "crossplane" refers to a specific design or configuration, primarily used in the context of engines. In the early 20th century, it referred to the arrangement of crankpins (connecting rods) around the crankshaft of an engine, where they intersect or cross each other at a right angle. This design was introduced to reduce the vibrations in the engine and counteract the uneven firing intervals.
