Ignition System: Description and Operation

Two ignition coils with power stages and two distributors are used on the Audi V8 Quattro. They are both controlled by the Motronic ECM.

Each coil and distributor is responsible for providing spark to four cylinders.

One distributor is mounted on the back of each cylinder head. Both distributors are driven by lugs on the exhaust camshafts.

A Hall sender is installed in the distributor mounted on the left cylinder head. The signal from this Hall unit identifies cylinder #1 for the start of the sequential fuel injection and cylinder selective knock regulation.