As of Friday afternoon.

    I am buying parts for 100 coil on plug units to be used for testing
    by Mazda (hopefully) and others.

    Will fire six times or more around TDC at 11,000 RPM.

    If somebody wants one or more for testing let me know.

    Paul Lamar.... Still in Virgina

    If all goes as planned be back in SOCAL Sunday night.

    Fantastic Paul, Milo



    Can I trigger them with the older crank angle sensor?

    Lewis Bjorkacro


    You can but you will only get two sparks close together on the
    front rotor. I take it this is the one you are talking about. A
    simple circuit could be built to use the lower part and count
    pulses.

    Best to take it out and save the weight. ABS wheel speed sensors
    are cheap and two are required for a two rotor. Or you can use 3rd
    gen or RX8 sensors. You can also make your own as all they are is a
    bar magnet with a coil of wire wound around it.

    This ignition system can also be triggered directly by a computer
    but it must be reprogrammed to eliminate the dwell time and enable
    multiple sparks.

    Paul Lamar   Back in SZP


    I'd like two for my single rotor.  Tell me how much $ and
    when/where.

    Lewis.


    In about 2 weeks. Introductory price is $175 each plus shipping.

    Paul Lamar

    Paul, one per plug, or one per rotor?

    Kevin Alderman

    One per plug. That is a standard in the auto industry now.

        Also the rotary racers use one MSD system per plug but one
would also have to buy
        and old style coil one per plug for another $50 or so.

        The MSD stops multi-firing at 4500 RPM. The multi-firing it
does do at low
        RPM is all grouped around 20 deg BTDC within a few usec.


    Paul Lamar


    I suppose if the leading and trailing plugs are both fired at 20
BTC, you could get one waste spark coil per rotor.

    Dale Davies

    That is a feature I have not yet implemented but it is possible
with my system.


    Paul Lamar



Using the waste spark coils gives less complexity and weight due to the
need for only one CD box per rotor and only one coil wired to it.
As you have discussed previously, running at 6000RPM in flight does not
need different timing for leading and trailing plugs. Also as you have
shown,
a simple vernier throttle cable could be used for a bit of advance
tuning in flight at cruise to get better BSFC. This just rotates the
pickups a few degrees.

Dale Davies


Good idea Dale.

This is easier to build and more rigid than a fixed bracket as there are no good places
to bolt to on the front cover. There are two ball bearings that keep it aligned
with the e-shaft.

Paul Lamar
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