märkäsekoitusruiskutukseen

Märkäsekoitusruiskutus, known in English as wet direct injection or wet manifold injection, is an older fuel delivery system for internal combustion engines. In this system, fuel is injected into the intake manifold where it mixes with the incoming air before being drawn into the combustion chamber. The term "wet" refers to the presence of liquid fuel in the intake manifold.

This method differs from dry manifold injection, where fuel is injected into the manifold but evaporates before reaching the cylinder, and from direct injection, where fuel is injected directly into the combustion chamber. Märkäsekoitusruiskutus was an intermediate technology, offering improvements over carburetors but eventually superseded by more advanced systems.

The primary advantage of märkäsekoitusruiskutus was its ability to provide more precise fuel-air mixture control compared to carburetors, leading to better fuel economy and reduced emissions. However, it still suffered from some drawbacks. Because fuel was introduced into the manifold, some of it could condense on the manifold walls, especially during cold starts or when the engine was operating at low loads. This unevaporated fuel could lead to uneven fuel distribution among cylinders and a less precise mixture.

Over time, as emissions regulations became stricter and engine technology advanced, märkäsekoitusruiskutus was largely replaced by port fuel injection (a form of dry manifold injection) and later by direct injection systems. These later technologies offer even greater control over fuel delivery and combustion, resulting in further improvements in efficiency and emissions reduction. While not common in modern vehicles, understanding märkäsekoitusruiskutus provides insight into the evolution of fuel injection systems.