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Message: <blockquote data-quote="Zeroed" data-source="post: 4496109" data-attributes="member: 98">Actually the new generation Alfa Romeo twin spark is a waste spark system... meaning the second spark ignites only to burn off unburnt fuel, performance wise there's almost no difference haha.I wish it made a difference, because I drive one.The direction of the spark makes a difference, so be careful in modifying or choosing spark plugs guys. The idea is by exposing the spark directly to the ignition chamber, the fuel ignites stronger and faster, giving you an additional 2-4hp. A normal spark plug has its spark inside the electrodes, meaning the spark is exposed to the cylinder walls at a wide angle, and not the piston. Modified (gapped) spark plugs, or those quad electrode spark plugs where the spark is directly exposed to the direction of the piston however can accelerate piston wear. Modified gapped spark plugs especially have a spark curve that is strongly exposed to one side of the piston, it has been known that engines with these modified plugs fitted that are driven hard often suffer from immature wear on one side of the piston (literally a dent/hole on that side of the piston).Im not sure about MSD or other stuff which greatly increases the spark's strength, but I suspect it may have a role in shortenning your engine lifespan as well. I'm sure the manufacturers calculated a specific strength for their ignition coils and spark plugs for a reason. If I had a highly tuned/high boost turbo engine, I'd stay away from crazy sparking systems just to be on the safe side. For normal cars then I think it might be negligible.Keep in mind that during the compression stroke, the air:fuel mixture is a highly compressed explosive substance stored in a small amount of space. When the spark ignites, it is best for the mixture to spread evenly instead of a strong concentrated blast in one spot, although it gives you a little more power.</blockquote>

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