straightfour

Straightfour refers to a type of internal combustion engine configuration. It is characterized by having four cylinders arranged in a single line, or "straight" orientation. This design is one of the most common and fundamental engine layouts found in automobiles and other machinery. The cylinders are typically positioned one after another along a crankshaft.

The straight-four engine is known for its simplicity in design and manufacturing, which often translates to lower production costs. Its relatively compact size also makes it a versatile choice for a wide range of vehicle applications, from small economy cars to larger sedans. The inherent balance of a straight-four engine is generally considered good, although it can be subject to secondary vibrations depending on the engine's displacement and design. Counter-rotating balance shafts are sometimes employed in larger straight-four engines to further mitigate these vibrations and improve smoothness.

Compared to other engine configurations like V6 or V8 engines, straight-fours are typically less powerful and offer a narrower power band. However, advancements in technology, such as turbocharging and direct injection, have significantly increased the performance and efficiency of modern straight-four engines, allowing them to compete with larger displacement engines in many scenarios. Maintenance is often straightforward due to the accessible nature of the components.