Weber integrated ignition system

WEBER INTEGRATED IGNITION SYSTEM

A - B Connected to terminals 1 and 19 of the control unit. C1...C4. To spark plugs (as indicated by numbers engraved on ignition coil frame) D. Power: from power relay (when ignition turned on)

1. Primary circuit.
2. Secondary circuit.
3. Power module, located inside electronic control unit.
4. Spark plugs.

A. Rpm sensor signal B. Power control in ECU C. Current flowing through coil primary winding a. Ignition advance in relation to cylinder TDC This is an electronic static twin-spark unit, with power module inside control unit (ECU) and lacking a distributor. It is fitted with two ignition coils with dual high tension outlets connected directly to the spark plugs of cylinders 3-2 and 4-1 respectively. Each primary circuit is connected to the battery voltage through the system power relay - with ignition switch turned to MAR -and earthed directly by the injection-ignition control unit to which the two primary windings are connected (via terminals 1 and 19 respectively). The spark plug (connected in line with high tension circuit) is supplied at a very high voltage when, upon the spark, the pressure inside the cylinder is high (compression stage) and gives a very low voltage when the pressure is low (exhaust stage). The ignition advance angle, governed by the injection-ignition ECU, alters according to engine rpm and inlet manifold pressure level - according to tables memorized in the control unit - and is corrected in accordance with the following parameters: coolant temperature; sudden changes in idle speed; pressure changes; return from cut-off; excessive engine rpm and during start-up.