Capacitor discharge ignition Capacitor discharge ignition Capacitor discharge ignition (CDI) or thyristor ignition is a type of automotive electronic ignition system which is widely used in outboard motors, motorcycles, lawn mowers, chainsaws, small engines, turbine-powered aircraft, and some cars. It was originally developed to overcome the long charging times associated with high inductance coils used in inductive discharge ignition (IDI) systems, making the ignition system more suitable for high engine speeds (for small engines, racing engines and rotary engines). The capacitive-discharge ignition uses capacitor discharge current to the coil to fire the spark plugs. The history of the capacitor discharge ignition system can
Mesoamerican Archaic period seasonally by largely mobile peoples in the Early and Middle Archaic periods. Based on the presence of specific plants, the rock shelter was inhabited during the wet season from July to September, then in the Archaic period, around 4700 BCE, from May to October. Some of the earliest known villages appear along sea coasts, specifically the Chiapas and Caribbean coasts. It is likely that the abundant sea and lagoon resources could easily support long-term, year-round settlements, leading people to settle first in these areas. Shell mounds in these areas are highly visible, which likely aided in their identification by scholars.