I just had this idea.
A stock 2nd gen Mazda CAS has all the required parts for a Lamar
ignition trigger mechanism. Namely, two magnetic sensors and a
sprocket like wheel.
The sensors need to be mounted 90 degrees to each other and half the
teeth removed from the sprocket like wheel.
Some of the floor of the housing will have to be removed to allow
both sensors to be mounted at the sprocket level..
A new steel bracket will be made to hold the magnetic sensors 90
degrees to each other.
More when I get a chance to do some 3D's.
The tricky part comes when it is realized the 2nd gen CAS runs at
half e-shaft speed :)
Does anybody have a suggested solution? There is a hint above:)
Paul Lamar
Paul,
Could you use the sensors as they are? My thought is to use the
home sensor as an interrupt to 'switch' the set of plugs you are
firing. You'd likely need to build another small circuit to do the
switching.
-Josh Jacobs
I'll have to think about that.
Got any circuits in mind?
A data selector could be part of it. See the attached jpg.
Toggling pin 11 would do it.
I think a flip flop would be needed as well.
Sync might be a problem. If it gets out of sync it would spark the
wrong rotor.
Paul Lamar --
Good point about the sync problem. In that case, a logic controller
may be the best bet. You could cut off one of the home switch teeth
so that it is your main reset interrupt. Your logic program could
count the pulses from the trigger wheel. It would flow like this:
Interrupt; at count <6, use output 1; at count 6 use output two;
interrupt... at 10k rpm the frequency of the trigger pulses will only
be 4khz, so finding a fast enough chip shouldn't be too hard.
Josh
Yes a computer would work but the whole idea here is to avoid
using a computer. Keep it simple and easy to understand. One
CAS per rotor.
Here are the latest 3D's. It will fit in the stock housing
with a little clearancing here and there using a die grinder.
Paul Lamar
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