Oscillograms From Different Manufactures

OSCILLOGRAM READINGS OF IGNITION COILS FROM DIFFERENT MANUFACTURERS:




Evaluation of ignition voltage spikes and the attenuation process at idle speed.

Manufacturer: Bremi
1. Normal ignition voltage spike (6000-9000 V)
2. Usual

Manufacturer: Beru
3. Normal ignition voltage spike
4. High start of attenuation processes

Manufacturer: May and Christe
5. Normal ignition voltage spike
6. Low start of attenuation processes

Manufacturer: Bosch
7. Low ignition voltage spike
8. Normal start of attenuation processes


NOTE: At high engine speeds the ignition voltage spike becomes shorter significantly shorter than units from other ignition coil manufacturers.


Evaluation of combustion voltage spike at raised engine speed of approx. 2500 RPM.




Manufacturer: Bremi
1. Normal response of combustion voltage curve
2. Normal combustion period
3. 3 to 4 attenuations




Manufacturer: Beru
1. Normal response of combustion voltage curve
2. Normal combustion period
3. At least 3 attenuations




Manufacturer: May & Christe
1. No response from the combustion voltage curve
2. Normal combustion period
3. At least 5 attenuations




Manufacturer: Bosch
1. Normal response for combustion voltage curve
2. Long combustion period
3. At least 3 attenuations