Scope Patterns For Various Ignition Coil Manufactures

Evaluation of Ignition Voltage Peaks and Decay Characteristics at Idle Speed

Make: Bremi
1 Normal ignition voltage peak (6000 - 9000 V).
2 Normal start of decay process.

Make: Beru
3 Normal ignition voltage peak.
4 Low start of decay processes.

Make: May & Christie
5 Normal ignition voltage peak.
6 Low start of decay processes.

Make: Bosch
7 Low ignition voltage peak.
8 Normal start of decay processes.

NOTE: At high speeds, the ignition voltage peak falls very markedly relative to the peaks on units from other ignition coil manufacturers.

Evaluation of Combustion Voltage Characteristics at Approx. 2500 Rpm





Make: Bremi
1 Normal oscillation of the combustion voltage curve.
2 Normal combustion period.
3 3 to 4 oscillations.





Make: Beru
1 Normal oscillation of combustion voltage curve.
2 Normal combustion period.
3 At least 3 decay oscillations.





Make: May & Christie
1 No oscillation on combustion voltage curve.
2 Normal combustion period.
3 At least 5 decay oscillations.





Make: Bosch
1 Normal oscillation of the combustion voltage curve.
2 Long combustion period.
3 At least 3 decay oscillations.