Engine management system - MEMS (Ignition components): Description and operation

IGNITION COMPONENTS

Ignition coil

’K8’ and ’K16’ models

’K16 with VVC’

The coil for the programmed ignition system is mounted on the back of the engine. The coil has a lower primary winding resistance (0.63 to 0.77 ohms at 20°C) than a coil in a conventional ignition system. This allows the full h.t. output to be reached faster and so makes the coil operation more consistent throughout the engine speed range.

Distributor cap and rotor arm

’K8’ and ’K16’ models

1. Distributor cap
2. Rotor arm
3. Retaining screw
4. Anti-flash shield

The distributor cap, carrying a central carbon brush and four h.t. lead pick-ups, is located at the No.4 cylinder end of the inlet camshaft and surrounds the rotor arm. The rotor arm is secured by a retaining screw to a ’D’ shaped stub shaft, which is press fitted into a vibration absorbing bush in the camshaft and is protected from oil contamination by an anti-flash shield which incorporates an oil drain.