I have 2 each of the coils used on the RX7- 2 leading units and
2 trailing units.  The leading unit fires both plugs at once
from a 5 volt trigger signal.

My plan is to 1. use the OEM crank trigger unit to signal a 555
board to fire the coils, one coil for each rotor.  2.  Use an
HE sensor to fire
the unit.

 It has been discussed that the plugs should fire at 22 degrees,
 but lately I have been reading 50 degrees- I assume that this
 is for dwell time?

 Should I set my timing for 22? Will the OEM unit work to fire
 the coils?  Does anyone know the output of the OEM trigger
 unit?

 Kevin Alderman

Did you test that 5V trigger Kevin. I never got around to doing
that.

I'll make sure to put CAS conditioning on the board. I was
considering using just Hall Effect sensor as they are much
cheaper.

The 50 degrees (not cast in concrete yet) is to give the
trigger board time to adjust the timing to 22 degrees BTDC at
all RPMs.

You will need two CAS. One for each rotor. Also a trigger wheel
with two tits.  Tits are clocked 180 degrees apart.  This will
give some back up as the engine will run on  one rotor.


 Paul Lamar


Yes I tested it. 12 volt primary with 5 volt trigger, common ground. I was
using an old set of plug wires, and found a crack in the insulation. A 3
inch arc to the knuckle.

The oem cas has 2 sets of points. One is 2 points 180 apart, the lower is
24 teeth. I was going to use the top set for initial testing of the engine.
I have the oem unit in place at 22 degrees at the moment.

Kevin Alderman.

Good info. Thanks Kevin

BTW an ABS sensor is the same as the Mazda CAS and is a lot cheaper at auto parts
stores. About $20 as opposed to $100.

Also BTW the 2nd gen CAS that looks like a abbreviated distributor can fire RX8 and
LS1 coils with the circuit I am working on.

Paul Lamar
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