Paul and guys,

Does anybody know how many amps the smart coils pull when charging?

I have an idea and this information would be helpful.

Kevin Alderman

RX8 coil. Over 7 amps with 5 V applied to the trigger. That is all my
power supply could handle. It reduced the PS 12 Volts to about 6
volts with 7 amps If you leave it connected it will shut down. They
are designed to be "on" for only 4 ms.

You need a real low impedance power supply or a 12 volt battery to
make them work.


I'll let you know tomorrow as I have a motor cycle battery back at
the house. I am at the hangar now.

Paul Lamar

Next question- with the knowledge that a constant 12v across C and B,
the coil will charge and eventually overheat. Can the coil charge for
4ms, then sit for another short period before being triggered?

Or will there be a spark as soon as the field collapses from the
input voltage drop?

The answer will have an effect on the timing.

Kevin Alderman

With computer chips less than a buck I would not surprise me if it
shut off if an attempt was made to keep it on for more than about 4 ms.

I have no way of knowing with out doing a lot of analyses testing.

In any case as far as I can tell it takes an EFI system to control them.

I want to make a simple ignition and carb fuel system so it takes less
than 5 or 10 years to install a rotary.

Besides I would not be a bit surprised if the RX8 flooding problem
was not mitigated by a simple CD ignition. It has the proven ability to
punch through fouled (AKA shunt resistance) plugs.

The other thing about CD's is they will work up to 11,000 RM  or higher which
a smart coil will not. The RX8 coils are on the bleeding edge
of inductive coils at 9000 RPM.

Paul Lamar


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