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12 13... Oscillograms of ignition coils from different manufacturers

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 BMW 325xi, 2005 BMW 325i, 2005 BMW 325Ci, 2004 BMW 325xi, and 2004 BMW 325i. However, it is still accessible from the selected car via links, so may be relevant.

Evaluation Of Ignition Voltage Peaks And Decay Characteristics At Idle Speed. 

Make: Bremi

  1. 1.  Normal ignition voltage spikes (6000-9000 V).
  2. 2.  Normal start of attenuation processes.

Make: Beru

  1. 3.  Normal ignition voltage peak.
  2. 4.  High initial level of attenuation processes.

Make: May & Christe

  1. 5.  Normal ignition voltage peak.
  2. 6.  Low initial level of attenuation processes.

Make: Bosch

  1. 7.  Low ignition voltage peak.
  2. 8.  Normal start of attenuation processes.
Note:  At high speeds, the ignition voltage peak falls very markedly relative to the peaks on units from other ignition coil manufacturers.

Fig 1: Evaluation Of Different Ignition Coils (Idle Speed)
G00313235Courtesy of BMW OF NORTH AMERICA, INC.

Evaluation Of Combustion Voltage Characteristics At Raised Engine Speed Of Approx. 2500 RPM. 

Make: Bremi

    Fig 2: Evaluation Of Different Ignition Coils At 2500 RPM (Bremi)
    G00313236Courtesy of BMW OF NORTH AMERICA, INC.
  1. 1.  Normal oscillation of the combustion voltage curve.
  2. 2.  Normal combustion period.
  3. 3.  3 to 4 attenuations.

Make: Beru

    Fig 3: Evaluation Of Different Ignition Coils At 2500 RPM (Beru)
    G00313237Courtesy of BMW OF NORTH AMERICA, INC.
  1. 1.  Normal oscillation of the combustion voltage curve.
  2. 2.  Normal combustion period.
  3. 3.  At least 3 decay oscillations.

Make: May & Christe

    Fig 4: Evaluation Of Different Ignition Coils At 2500 RPM (May & Christe)
    G00313238Courtesy of BMW OF NORTH AMERICA, INC.
  1. 1.  No oscillation on combustion voltage curve.
  2. 2.  Normal combustion period.
  3. 3.  At least 5 decay oscillations.

Make: Bosch

    Fig 5: Evaluation Of Different Ignition Coils At 2500 RPM (Bosch)
    G00313239Courtesy of BMW OF NORTH AMERICA, INC.
  1. 1.  Normal oscillation of the combustion voltage curve.
  2. 2.  Long combustion period.
  3. 3.  At least 3 decay oscillations.

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