CDI Ignition Coil Capacitive Discharge Ignition

An on-plug coil for use with Capacitive Discharge Ignition (CDI). Design and manufacture is in-house, so we can make the coil to suit your specific application. The information given here is for a typical coil. Many of the parameters can be tailored to a particular installation.

Please contact our technical consultancy service to discuss your requirements.

In Detail

Application

  • Capacitive discharge ignition systems.

Electrical

Typical measurements at 25°C (except where stated otherwise)

  • Primary DC resistance 800 to 1000mohm
  • Primary inductance 252 to 332μH

The following measurements are made with a power unit consisting of a 0.33μF capacitor, charged to 460V (35mJ) supplying the coil with a peak primary current of 35A. The coil is mounted in an aluminium block to simulate a cylinder head.

  • Secondary high voltage (fired off-load*) 26kV typ
  • Secondary energy discharged into 2nF load 20mJ typ
  • Burn time of open spark > 50μs (burn threshold 100V, at atmospheric pressure)

* Firing the coil off-load should be avoided as it can cause cumulative damage by electrical breakdown.

Cable and Connection Definition

  • 22AWG un-screened cable
  • Any cable length is available on request
  • Various automotive and military standard connectors are available
  • Connection
  • Red wire Pin A Pin 1 Primary Switched
    Green wire Pin B Pin 2 Primary Non Switched
    White wire Pin C Pin 3 Secondary return

Connect the primary so that “Primary Switched” is negative with respect to “Primary Non Switched” during discharge. The spark plug centre electrode discharge will be negative with respect to ground. The “Secondary Return” allows an ECU to measure the secondary current to confirm proper operation.

Mechanical

  • Polyester body
  • Minimum diameter 20mm
  • Minimum length from top of coil to top of spark plug 80mm
  • The body can be made longer and/or wider to suit a specific installation
  • HT connection plunger travel 3mm. A fixed HT contact can be provided
  • Axial clamping force 35 to 45N
  • Weight less than 130g (including 1000mm cable)
  • Elastomer boot for strain relief to the coil body
  • Fluoro silicone boot or o-rings to seal spark plug

Environmental

  • Resistant to standard motorsport fluids
  • Operating temperature 0 to +150°C
  • Maximum temperature +180°C for 10mins (coil not firing)
  • Viton jacketed cable
  • Vibration 50 to 2500Hz @ 40g 8hrs per axis

Images/Diagrams

CDI Coil

CDI Coil

Ordercodes

Description Ordercode
Please contact our technical consultancy service to discuss your requirements O 030 XXX XXX XXX

Contact us about CDI Ignition Coil

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An on-plug coil for use with Capacitive Discharge Ignition (CDI). Design and manufacture is in-house, so we can make the coil to suit your specific application. The information given here is for a typical coil. Many of the parameters can be tailored to a particular installation.

Please contact our technical consultancy service to discuss your requirements.

McLaren Applied Technologies
Manufactured by: McLaren Applied Technologies
Model: CDI Ignition Coil
Product ID: Capacitive Discharge Ignition

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