DIYEFI.org Forum

How would secu-3 handle a 72 degree v-twin with a cam sensor? It is vital to avoid wasted spark with these odd-degree motors, as users of other systems have found, it burns holes in pistons. Is there a possibility of adjusting advance separately for each cylinder? Or of using a fixed difference between the coil firing that is not a multiple of 90 degrees?

Actually, I don't know technical details about of working of 72 degree v-twin engines. SECU-3 firmware can be changed to support most types of engines and some additional features can be added, but it needs some development time and resources. I will tell you how current implementation works and you will make conclusions by yourself. So, current firmware implementation:
- Supports up to 8 cylinders in full sequential mode (CKP sensor + cam sensor required);
- Supports up to 8 cylinders in semi sequential mode (CKP sensor required);
- Supports engines with even number of cylinders (e.g. 1,3,5);
- Does NOT support adjusting of advance angle and knock retarding separately for each cylinder;
- Fixed difference between coil firings can be not a multiple of 90, but it has to be the same for all cylinders;
- Advance angle can vary during runtime in range: -15...60 degrees (crankshaft);
- Allows you to shift firing in all cylinders (simultaneously) relatively to TDC.

One more question. Is your engine 4 stroke?

Sounds feasible then.. its a 500cc four stroke (1980 Moto Morini). I'm going to open up the cam sensor and try to figure out how it works. It was one of the first bikes with a semi-electronic ignition. Currently coil power is provided by magneto, that would have to change.

2 cylinders, 4 stroke - OK. Which maximum RPM do you want? Note that current implementation of firmware limited to 12000...14000 min-1

I'm going to open up the cam sensor and try to figure out how it works

It will be interesting.

This is old tech... 8000 rpm max.

Thanks for info... will report back soon.

Seems all the work has been done for me. The pickup is magnetic, the advance is driven by a circuit in a transducer which contains a 6 volt coil. The advance curve is also documented. The trigger is at 1.35 volts.