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 was trying to get a handle on using this system with the EFI that I
am working on for my engine. 4 units means 4 triggers from the ECU,
which means 4 output pins and at least 2 input for the crank
triggers, which would eliminate the need for delay calculations.
Right now I have 2 HE inputs and 2 trigger outputs for the coils that
I have and some code for dwell. I can eliminate the dwell part, but
this would mean a partial re-write of my code :). With the leading
and trailing plugs, it might be beneficial to fire the plugs at
slightly different times to push the flame front around. I would go
ahead and write the code to allow for this if necessary.
Kevin Alderman
If you trigger both upper and lower plugs at the same time you only
need two outputs and two inputs. With one input you would need to
calculate the second rotor trigger time based on RPM. That is the
beauty of the second CAS signal.
The RX8 trigger wheel gets crank angle and TDC signals with one CAS.
There is a missing pulse detector for rotor 1 TDC IMHO and the second
rotor TDC. That complicates the software.
I have never fed an RX8 signal into an off the shelf reluctance
sensor. I suspect it would not work. Attached is the CD4049 circuit I
used to take the scope pictures.
The third gen uses two CAS's.
The second gen also does this with two CAS's as well.
In 15 years we have tried almost everything :)
Paul Lamar
Congratulations Paul ! It's been a long haul and you have done a tremendous
job of not only developing this but helping others feel a sense of
ownership as
you have considered our input. Great work.
roger paxton
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