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Posted by Bucko
- September 05, 2021, 00:06:47 AMQuote from: chief on September 04, 2021, 22:49:23 PMSo, in the case of a twin-plug V-twin, both plugs in the same cylinder (on the same coil output) fire at the same time. Since the two plugs from one coil complete the high voltage circuit - they both fire with equal 'energy'.Dual fire shoots spark to both cylinders at the same time from an single coil. Most of the spark goes to the cylinder under compression while a smaller bit go to the exhaust stroke. There is some "wasted spark" as a result.
I'm pretty sure both plugs (in a cylinder) fire for both the compression stroke and the exhaust stoke (i.e. both plugs fire a 'wasted' spark).
Posted by chief
- September 04, 2021, 22:49:23 PMQuote from: Bucko on September 04, 2021, 20:53:24 PMWhen you mention 'dual fire', is that the same as: 'wasted spark' (like on inline 2, 4, or 6 cylinder bikes)? If ignition is triggered by crank position sensors, which I think they are, then it's likely a wasted spark, no?
Dual fire shoots spark to both cylinders at the same time from an single coil. Most of the spark goes to the cylinder under compression while a smaller bit go to the exhaust stroke. There is some "wasted spark" as a result.
Posted by Bucko
- September 04, 2021, 20:53:24 PMWhen you mention 'dual fire', is that the same as: 'wasted spark' (like on inline 2, 4, or 6 cylinder bikes)? If ignition is triggered by crank position sensors, which I think they are, then it's likely a wasted spark, no?
Posted by chief
- September 03, 2021, 18:02:06 PMOpening up this topic for discussion.
Considering the age and differences of our Drifters (1500 and 800) - do our bikes have single or dual fire ignitions? Both the same? Different on 800 and 1500?
If you know the answer(s) post your info here, references if you have them.