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Understanding Multi Coil Systems

Araparts - Understanding Multi Coil Systems

 

Over the last few years, multi-coil systems, including Coil-Near-Plug, Coil-On-Plug and waste spark system systems have been trending, something our Araparts ignition coil experts are well aware of, moving away for distributorless ignition systems. Coil On Plug ignition systems, in particular, have become popular for several reasons including maintenance, emissions and performance.

 

Coil Near Plug (CNP)

This ignition coil system uses either an insulated short, plastic stick like part, or a spark plug boot made of rubber, to extend down into the engine in order to reach the spark plug. This prevents the transformer area of the coil from getting to close the metal cylinder head.

 

Coil On Plug (COP)

These ignition systems are used on a number of late model engines. In the majority of applications, the coils and plugs are positioned on top of the cylinder head, making it easy to mount the coils. Because they're located on the top, it also keeps the coils from being affected by the heat generated by exhaust.

 

Waste Spark System

In wasted spark ignitions, both spark plugs fire at the same time. One of the spark plugs will be fired within the compression stroke of the first (A) cylinder - (power).; the other spark plug in the exhaust stroke of the other cylinder (B) - (wasted). When it's time for cylinder “B” to fire in compression, the “A” cylinder fires in the exhaust stroke.

 

Simplifies and Boosts Performance

By placing a single ignition coil over each spark plug, the need for bulky, long high voltage spark plus cables is eliminated. One of the main benefits of this design is that it reduces RF (radio frequency) interference, eliminates misfire problems that are typically caused by loose, burned or chaffed cables. This style also lessens resistance issues between the ignition coil and plug. As a result, each coil can be lighter, smaller and require a smaller amount energy to fire its spark plug.

 

When it comes to performance, having a separate ignition coil for each cylinder allows more time for each coil to recharge in between cylinder firings. Single ignition coil distributor systems on the other hand need to fire two times with each revolution of the crankshaft in a 4-cylinder engine, 4 times in a V8 engine. Because multi-coil systems only need to fire once and only every other revolution of the crankshaft, not only will there be fewer misfires, there will be cleaner combustion and improved fuel economy. Multi-coil ignition systems can also improve idle emissions and stability.

 

Avoiding Ignition Coil Problems

Coil on plug (COP) problems include the majority of the same problems that occur with other ignition systems, including misfiring, difficult to start or not starting at all. In addition, the spark plugs can be damaged by fuel or oil deposits, along with detonation and preignition. You can avoid most coil problems by cleaning the terminals and connectors when you install a new coil. Corrosion can result in loss of continuity, intermittent operation and loss of continuity and eventually contribute to component failure. By applying dielectric

grease to the terminals and connectors as well, you can help protect against corrosion and ensure a good connection.

At Araparts, we specialize in high quality ignition coils and coil packs and our customers are our top priority. Our products are also competitively priced and covered by a minimum 1-year warranty. Call (916) 585-6835 or visit http://www.araparts.com and experience the Araparts difference.