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Subpage of MembersPage/YasecElise '''Wasted spark ignition''' Coil on plug style wasted spark transformers, so (beside the 2 pin power-input connection) each transformer has 2 HV connections * one directly to sparkplug * and the other to the cylinder-pair (1-4 and 2-3). The transformer cores are firghtening small. We were note sure they are inductive (not CDI) operation. But they seem to work well with inductive. Each transformer has 2 pins, that means it cannot be "active coil". So the inputs are power-inputs for sure. type: * NEC 000130 5009 ** 0040 100 502 0000 ** Beru Korea Similar type with slightly shorter HV connection: * NEC 100730 ** MB029700-8230 ** 12V GCL209 ** DENSO SPAIN ** 5009 The 12V text is promising, it would not make sense for a CDI coil. Also, the engine was running with the 2nd transformer, with shorter than 3ms dwell (2.5 ms was used ? guesstimated without measurement). But with the shorter HV connection, the spark sometimes happened at the wrong end of the sparkplug. 2.5 msec (VBatt=14V) seems to be a bit too high current: Using 3 x 0.1 Ohm 5W in parallel (as measuring resistor, in series with one coil's primary winding), at 1200 RPM * (9mV / 0.033 Ohm) DC mean current was measured (on ONE coil, that is fired every crankrot), which means mean current while the coild is charged: * Idc = 0.009/0.033 * 60000/1200 / 2.8 = 4.87 A notes: ** the 60000 msec / 1200 is the time of 1 crankrot at 1200 RPM ** 0.009 / 0.033 is the 9mV / 0.033 Ohm ** / 2.8 is for the the 2.5msec actual dwell (as read from LCD; higher than 2.5 msec because the VBatt was lower than 14V The peak current is twice as much, that is 2 * 4.87 = 9.74 A, which is a bit high (5..8A is usually best) Marcell recommends trying 2.1 msec dwell and measuring again.
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