So I worked on updating the web site.

Please read and comment.

http://www.rotaryeng.net/coax.html <http://www.rotaryeng.net/coax.html> Paul Lamar


Paul,
   As I keep saying, his is too simple to work, but it does.   I
will have plenty of time to test one while I am waiting for my reduction box
to destruct, so will test a few including this in the process. When are
coils available??

Neil.

The kind you need for the Microtech EFI are still in R&D.
As soon as it works I'll let you know.

Paul Lamar

Paul,

Is it possible to put 2 units in the same metal box (the one that you put it in and pot it) to save space?
I am almost done with N45WE (Yay I have a plane again), and will soon get back to my rotary plane. I am working on the EFI but think it would simplify the system to have the ECU run the fuel system and let your system run the ignition. One concern:

The fixed ignition aircraft engines use 20~25 or so degrees as the fixed point with impulse couplings to delay the ignition during starting, and to let the spring speed up the rotation speed internally for a better spark. To make starting easier we would need to see if there is a way to incorporate the delay feature into the completed on-aircraft system I think. I am working on a Sonex also with the VW engine at 25 degrees fixed magneto timing. During starting I have to keep the mixture full lean until the engine is spinning as fast as it will go or it will kick back. A weak battery and it wont hardly start at all. If I delay the timing by as much as 10 degrees it starts better but with noticeably less power. Thoughts?

Kevin Alderman

It is a tight fit in a 2" by 3" box so putting two side by side would be about
the same.

Piece of cake with a micro computer :)

I got the Bascom book on the AVR. Here are some scans.

Super simple. My Golden Retriever Suzzy could learn to program in BASIC :)



Paul Lamar

I was leaning toward keeping the ignition separate from the ECU for several reasons RFI and noise among the most prevalent ones, but you are right sending a trigger signal would be no problem with the ECU. The trigger you are working on, will it take the single trigger and use that to initiate a 6 or so firing sequence or do I need to program 6 pulses from the ECU to make it work? The OEM computers that you are trying to interface with only send a single pulse, so I am assuming that the multiple triggers have to be taken care of internally to your system?

Kevin Alderman


Good idea. That spark plug and wire make one heck of a transmitter and
transmitting antenna.

Here are the scans right side up :)

The new trigger in R&D will take a pulse from a computer designed to fire
a smart coil like the RX8 coil or an LS1 coil. If it works :) These coil have delays
anywhere from 2 ms to 10 ms.

At 8000 RPM that is a lot of degrees :)

Paul Lamar

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