Technology - Reasons for 2 spark plugs per Cylinder ? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 42 Old 08-24-2019, 04:02 PM Thread Starter
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Technology - Reasons for 2 spark plugs per Cylinder ?

I know this Technology is not new and has been seen for many years in other industry's.

But how does this application benefit from the 2 plug per head design.?

Better fuel economy, Improved throttle response, Lower emissions , etc.

I might have the bases covered above but are there other reasons ?


And my first question is : if one of the plugs stopped working would you know it ?

Trigger check engine light ? Engine rpm stumble ?

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post #2 of 42 Old 08-24-2019, 04:53 PM
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Quote:
Suzukiís Dual Spark Technology, unique in this class, utilises two spark plugs per cylinder for precise ignition. Combined with the newly adopted high-ignition nickel spark plugs, it contributes to increased combustion efficiency, smoother power delivery, lower fuel consumption and lower emissions.
https://www.suzukimotorcycles.com.au...0-abs/features

and it does work indeed.
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post #3 of 42 Old 08-24-2019, 05:04 PM
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I think combustion efficiency is the main reason. Piston engine aircraft have run a dual magneto/ spark plug arrangement for years. Mainly for redundancy in case a magneto fails. Part of a pilots and mechanics check is a magneto drop test. During engine runup at a specified RPM each magneto is shutoff to check the other. There was usually about a 150 RPM drop with one mag switched off.
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post #4 of 42 Old 08-24-2019, 05:17 PM
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Initial reasons for two spark plugs per cylinder were for reliability. Spark plugs commonly fouled decades ago.

Then they were used to lower emissions. And to increase power. Some combustion chamber designs are more efficient than others. Adding a second spark plug would help a less efficient design meet emissions requirements or produce more power.

Why does a second spark plug lower emissions or increase power? It adds a second flame front. When the fuel/air mixture ignites, how it travels from that point has a lot to due with how well the fuel/air mixture is consumed. There can be pockets of mixture that don't "burn" due to stagnant movement or other issues that combustion chamber has. The further a flame front travels, which takes time, the more likely the controlled burn can become out of control and explode ( detonation ). By using a second flame front provided by a second spark plug, the distance traveled is reduced, as is time for the mixture to completely burn, and this tends to more completely burn the fuel/air mixture. This reduces hydrocarbon emissions, lessens detonation issues. And a by product is increased power for the same amount of fuel used.

A really good combustion chamber design may not benefit from a second spark plug ( which in itself complicates combustion chamber design ).

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post #5 of 42 Old 08-24-2019, 06:38 PM Thread Starter
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I would think it might be more likely to decrease emission levels due to the fact that one plug is on the side of the head
and one is located more central to the head nearer to the intake and exhaust valves.

2017 DL 650 , Shad 23 bags, Givi crash bars, 32 watt LED aux lights , Goldwing pegs, Metalic silver front fender, Lazer cut aluminum Chain guard, Madstad 20" windshield
light smoke tint , Blu/blk Driven Racing Billet bar ends, Dbl Take adventure mirrors , BeadRider Ceramic bead seat cover,
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Avatar image is a custom made Harley Sportster all hand built from junk parts from a retired engineers desk. Took 80 hours to make.
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post #6 of 42 Old 08-24-2019, 08:42 PM
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I would think that anything that creates a fuller and more complete combustion process will also create more power, lower emissions, and greater fuel economy.

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post #7 of 42 Old 08-24-2019, 08:54 PM Thread Starter
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Do many ( or any) of the newer motorcycles other than Suzuki use this design engineering Trait ?


It is amazing that they are able to squeeze allmost 70 h.p from a 650 cc 2 cylinder engine ( in my case )

I have seen Single Cylinder Briggs and Stratton engines used in Junior dragsters Hopped up to the point
they run Alcohol /methanol and turn more than 8000 rpm. and 50 h.p And these are just run of the mill
5 h.p go kart engines that have been extensively modified. You have to give these engineers a lot of credit for
knowing how to make power in a small package. Motorcycle engineers just do it with a warranty in mind.

2017 DL 650 , Shad 23 bags, Givi crash bars, 32 watt LED aux lights , Goldwing pegs, Metalic silver front fender, Lazer cut aluminum Chain guard, Madstad 20" windshield
light smoke tint , Blu/blk Driven Racing Billet bar ends, Dbl Take adventure mirrors , BeadRider Ceramic bead seat cover,
Stock exhaust for now. Yoshimura 3/4 system simmering on low in the oven.

Avatar image is a custom made Harley Sportster all hand built from junk parts from a retired engineers desk. Took 80 hours to make.

Last edited by RestoRider2017; 08-24-2019 at 09:05 PM.
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post #8 of 42 Old 08-24-2019, 09:04 PM
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Adding a second spark plug was a way to boost HP a few years ago on my 1974 Moto Guzzi SP 1000. I suspect it was done way before that year, too.
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post #9 of 42 Old 08-24-2019, 09:42 PM
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The tenere runs a 2 plug head and they are located side by side. It also uses coil packs on the plugs to direct fire the spark plugs. For a 1200cc, the tenere is mildly tuned at 100 hp.
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post #10 of 42 Old 08-25-2019, 04:46 AM
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I bet new v-strom 2020 won't use 2 sparks per cylinder anymore, cost saving will take effect
plus all good technology seams to be disappearing recently so pick up your strom while you still can
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