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David,
Just recently resolved my RMI tach issues so I think I can provide some guidance. I drive the RMI tach from the yellow wire off the Mazda coils. This provides a 12volt 2ms duration pulse twice per revolution.
Configure the RMI as for a 4 cylinder engine.
Using a pulse generator on the bench I found that if the signal went below about 10volts the tach would stop working. The RMI tach only worked up to 4500RPM and then would read half the RPM's above 4500. This is due to a one-shot circuit that Ron has built in to suppress spurious glitches from getting through.
Unfortunately it is set up with too low an R/C time constant for our use. However it can be fixed with a simple resistor change. If you would like more info on this fix feel free to contact me off line or contact Ron at RMI as I have recently.
Jim Maher
Dyke Delta/13B
--- Original Message ---
From: "David Leonard" <Daveleonard@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Tach Divider
This brings up a good point that I have been meaning to ask - esp.
Tracy. I wired my CAS the EC2 as instructed, but I also wired one of
the leads in parallel with the hall sensor on my Rocky Mountain Engine
Monitor. Does anyone think that this will not work? I'm not really
sure how the hall sensor worked, but I figured the motion of the magnet
created a small voltage spike in the circ. I figured the spike would be
big enough to trigger 2 voltage sensors (one in the EC2 and one in the
RMS Monitor) at the same time without causing any problem. This will be
one of the things I look at if all does not work well at fist start, but
does anyone know for sure this will not work?
Thanks,
David Leonard
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