Twin-spark heads - why?
Answers:
It's called waste spark or secondary spark,and it's design is to make sure you have a complete burn.Which gives you less pollutants.It's actually a pretty good idea for regulating unburned gasses.
Hope that answered your question.
to get a complete cleaner burn
contrary to what you might believe, the burn rate can be affected by the location of the spark
It makes the fuel burn more fully, some engines have 3-spark points on the spark plug.
Usually on Deisel engines as deisel is harder to combust.
its more dependable and will last longer and preform much better over time
Its derived from race car design where at higher rpm it ensures more efficient combustion. Porsche have done this, its common on Alfa romeo road car designs.
It is mainly done to reduce emissions. Dual spark plugs do help burn off more of the fuel in the combustion chamber, therefore reducing harmful emissions. This is common in some of the older Ford Ranger engines.
Light aircraft engines have two spark plugs per cylinder. It helps for a more complete combustion and is more reliable as the engine will run on the one remaining system if a fault occurs. At 1500rpm, you will get about 125rpm drop when one ignition system is switched off for testing.
more fuel going into inlet manifold needs a stronger spark to ignite otherwise it would flood and not start
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