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Posted by tj
 - September 06, 2021, 07:34:45 AM
Quote from: Bucko on September 05, 2021, 00:06:47 AM

So, 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'.

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).

This is exactly the way I understand it.
Posted by Bucko
 - September 05, 2021, 00:06:47 AM
Quote from: chief on September 04, 2021, 22:49:23 PM

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.

So, 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'.

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 PM
Quote from: Bucko on September 04, 2021, 20:53:24 PM

When 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 PM

When 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 PM

Opening 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.

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