Do expensive spark pluge and wires really make that much of a difference? if so what are the best ones

 

'61,

I'm not sure exactly what you mean by "expensive" plugs, but price may or may not be an indication of the value. A spark plug that costs a lot but doesn't perform or last any better than a standard plug is a waste of money, and therefore, expensive. One that fails at an inopportune time can be really expensive.

I've had very good luck with Champions - just the plain-Jane old copper cores. AC Platinum plugs are good, and tend to wear at the tip a lot les than standard plugs. Standard AC "Fire Rings" are just fine, but I prefer a plug body that has some electroplating (like the Champions) to provide that little extra protection and prevent things like this:



However, if your engine isn't running perfectly, the platinums will foul as quickly as any other plug and require replacement or cleaning just as often. The other concern about platinums is that while they generally don't need replacement as often, since you aren't removing plugs regularly, you have one less piece of information about how your engine is running. Spark plugs can be an excellent barometer of general engine operating condition. If you remove the plugs every year or so for inspection, don't be afraid to re-use the platinums if they are in good condition.

Wire can be an entirely different story. Many people spend extra cash for "designer" plug wires that are only pretty on the surface. The tendency is also to use wires that have a low resistance, since common logic would dictate that lower resistance would provide more spark energy. While this may seem to be true, if you do the calculations (I=E/R), you'll discover that a few hundred ohms at 25-30,000 volts makes an immeasurable difference in spark current (energy). And while the resistance doesn't affect the initial spark, the resistor wires can certainly help reduce or eliminate the spark dither and electrical noise created by the wires "broadcasting" the energy. I always have to chuckle at those people who religiously preach the use of straight wires, but use resistor plugs. Where's the logic in that?

Silicone jacketed wires are arguably the best choice for high heat applications. And the larger diameter generally provides the best insulation and most durable wire set.

Standard or platinum single side electrode plugs and 8mm silicone resistor wires are almost always a safe choice.

 

I'd recommend the MSD Superconductor wires. They're not that expensive and from what I've heard are very good. That's what I'll get the next time I need some.