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Automobile Ignition Question

Discussion in 'General Electronics Chat' started by Bob Scott, Dec 30, 2010.

  1. tcmtech

    tcmtech Well-Known Member Most Helpful Member

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    Yes and from the early 70's well into the mid 90's we had a whole generation of vehicles with emissions systems and that still had carburetors. The conversion from full non emission carburetor to full emissions compliant fuel injection did not happen in one day to all makes and models of vehicles. Many of those transition period vehicles are still on the roads today.
     
  2. jareeb

    jareeb New Member

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    at school im taking a small engine class and on the older engines the use beaker points and condenser they read 2.5 millihenries on the coil with is just a 2 fas the makes like 20,000v, and the condenser made if i can remember it was .85 uf to .956 uf
     
  3. nigel wright

    nigel wright New Member

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    So how do modern petrol engine ignition systems work without a capacitor ?
    I worked on an ECU for a motorbike and just used a mosfet to turn the coil on and off.
     
  4. dave

    Dave New Member

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  5. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    Please show us the circuit that worked for >10,000 miles without a capacitor. BTW, this thread is quite old.
     
  6. nigel wright

    nigel wright New Member

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    Its very simple the mosfet holds the coil on for 2mS then turns the coil off causing a big spark.
    There are no points in the design.

    I also worked on an electronic ignition upgrade for cars that used a transistor to turn the coil on and off. The points just became a switch for the electronics to synch off.
     

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