Lämminkäynnistys

Lamminkäynnistys, a Finnish term, translates to "warm start" in English and refers to the process of restarting an engine or electronic device after it has been recently used and is still at an elevated temperature. This is distinct from a cold start, where the engine or device is powered on from a completely inactive and cooled state.

In the context of internal combustion engines, a warm start can differ from a cold start in several ways. The engine's oil is already warm and more fluid, which can lead to easier cranking and faster lubrication. Fuel may also vaporize more readily at higher temperatures, potentially requiring less enrichment from the fuel injection system or carburetor. This can sometimes result in a smoother and quicker startup compared to a cold start.

For electronic devices, a warm start might involve resuming from a sleep mode or a quick reboot. Unlike a complete power cycle (cold start), a warm start may retain some cached data or system states, allowing for a faster return to full operational capacity. The term is less commonly used for general consumer electronics than for automotive or more complex machinery where temperature significantly impacts startup performance. The efficiency and characteristics of a warm start are often considered by engineers when designing systems that undergo frequent stops and starts.