TFI IV

PURPOSE

Distributor (Typical) - Exploded View:

The distributor directs secondary high voltage to the spark plugs. The Hall effect Profile Ignition Pick-up (PIP) sensor provides base timing information and engine speed and position.

CONSTRUCTION
The gear driven distributor is die cast aluminum. The components of the distributor include:

- Hall effect PIP sensor (stator)

- ferrous metal rotary vane cup (armature)

- shaft assembly

- octane rod

- ignition module.

OPERATION

Hall Effect Device:

The distributor uses a Hall effect (PIP) switch assembly, causing the ignition coil to be switched OFF and ON by the TFI and Electronic Engine Control (EEC) modules.

Rotary Vane Cup:

As the window of the vane cup is between the magnet and the Hall Effect device, a magnetic field is completed.

Hall Effect Device Response To Vane:

As the vane passes through this opening, the flux lines are shunted through the vane and back to the magnet and voltage is produced.

As the vane clears the opening, the window edge causes the signal to drop to zero volts.

This signals crankshaft position and desired spark advance based on engine demand and calibration.

Secondary voltage distribution is accomplished through a rotor, cap and ignition wires.

The octane rod adds a provision for a fixed octane adjustment. This is done only if the engine is experiencing a pinging or engine knocking condition and can not be repaired with the conventional methods (timing adjusted, proper operating temperature, higher gasoline octane rating .... etc.).