Spark Control Computer (SCC)

An infinitely variable ignition advance curve is possible using the SCC. Different modes of engine operation require changes in ignition advance. The SCC determines optimum ignition advance under all engine conditions. Accurate and flexible control of the advance curve gives the system the capability if igniting a lean air/fuel mixture. SCC reaction time is measured in milliseconds.

The SCC signals the ignition coil to produce voltage required for ignition purposes. The voltage produced is based on the demands of air/fuel ratio, air and coolant temperature, load and RPM. The SCC analyzes signals from sensors to determine engine operating conditions. It then adjusts ignition timing to the maximum ignition advance possible for existing conditions.

The SCC is part of the engine's air intake duct. It is located on the fenderwell. Engine sensors include a vacuum transducer (mounted on the SCC housing), a Hall Effect pick-up assembly, an engine coolant temperature sensor, and an oxygen sensor.