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Tech Info - Spark Plugs

How much power can I expect from a spark plug change?
A common misconception is that changing spark plugs will sometimes result in large power gains. In most cases, removing even seriously worn out spark plugs, will only result in very modest power gains, typically about 1%-2% of total engine output. Most newer cars engines are efficient enough that they are already burning the majority of the available fuel. But, as time goes on, spark plugs lose much of their electrode surface area to natural erosion. When this occurs, even the best ignition systems will be strained to supply enough voltage to bridge the gap, and some fuel is left unburned. It is at this point that a spark plug change becomes necessary. When this happens, a variety of factors will determine which spark plug would be best suited for a particular application.

In highly modified engines, specific electrode/tip configurations, electrode materials, and colder heat ranges can indeed provide measurable gains in power. When a stock or near stock engine is given a fresh set of spark plugs, peak efficiency is restored, and the power gains that come from this restored state of tune are usually minimal. A manufacturer that tells you that their spark plug will provide significant gains in power in a stock or near stock engine is making blanket statements that may be insupportable.

At RPM Outlet, we have been running NGK plugs for nearly 15 years. We have tried all of the new plugs on the market including split fire, rapid fire, and the new, more expensive Denzo Iridium Plugs. In each of these cases, we have not found any noticeable increases in 1/4-mile track times with these plugs. We have always came back to the NGK Spark Plugs because they seem to last the longest, and they are not as expensive as any of their competitors. We recommend using NGK Spark Plugs as opposed to generic spark plugs because of their superior quality, minimal expense, and long life.

Triple-Gasket Sealing Process
Virtually eliminates the possibility of combustion gas leakage through the shell. Most other manufacturers only use two seals.

Solid-Copper Core
Produces a more powerful spark with less firing voltage. Other manufacturers use a "copper coated" center core.

V-Groove
Forces the spark to the outer edge of the ground electrode, placing it closer to the air/fuel mixture. This allows the spark to more quickly ignite the mixture, providing more complete combustion.

Cold-Rolled Threads
For easier removal and installation.

Corrosion Resistant
Zinc Chromate Coating Double-dipped for maximum protection. An NGK exclusive.

Alumina Silicate Insulator
Is virtually pure to insure dielectric and physical strength, as well as heat transfer away from the tip for maximum performance.

Corrugated Ribs
Eliminate "flashover", which can cause misfiring and engine damage, especially in damp environments.

Part #	Type	Application	Price
NGKTR7IX	NGK V-Power *Iridium* Ford-GM Only	V-Power Spark Plug Supercharged Hi-Boost, N.O.S. applications Two heat ranges colder (iridium) Spark Plug	$ 8.00 (ea)
NGKBR7EFS	NGK NGK Tight-gap Copper Race Plug Ford-GM Only	NGK Tight-gap Copper Race Plug Supercharged Hi-Boost, N.O.S. applications Two heat ranges colder Race spark plug	$ 3.00 (ea)
NGKTR6	NGK V-Power Copper Race Plug Ford-GM Only	V-Power Spark Plug Supercharged Hi-Boost, N.O.S. applications Single heat range colder (copper) V-Power Spark Plug	$ 2.50 (ea)
NGKTR5	NGK V-Power Copper Ford-GM Only	V-Power Spark Plug High Performance V-Power Copper Plug Upgrade Standard heat range (copper) V-Power Spark Plug	$ 2.50 (ea)
ZEX-82070-8	ZEX Power Tune™ Plugs Ford-GM Only	ZEX Power Tune™ Plugs Designed for Bolt-on performance applications Single heat ranges colder spark plug	$ 59.00 (set of eight)
ZEX-82071-8	ZEX Power Racer™ Plugs Ford-GM Only	ZEX Power Racer™ Plugs Supercharged Hi-Boost, Turbos, N.O.S. applications Two heat ranges colder spark plugs	$ 59.00 (set of eight)
NGKLTZIX	NGK V-Power *Iridium* HEMI Only	DODGE HEMI Engine - High Performance V-Power Plug Improved Performance (iridium) Spark Plug Supercharged Hi-Boost, N.O.S. applications	$ 9.00 (ea)
NGK4306	NGK V-Power Copper HEMI Only	DODGE HEMI Engine - High Performance V-Power Plug Supercharged Hi-Boost, N.O.S. applications Single heat range colder (copper) V-Power Spark Plug	$ 2.50 (ea)
NGK5306	NGK V-Power Copper HEMI Only	DODGE HEMI Engine - High Performance V-Power Plug High Performance V-Power Copper Plug Upgrade Standard heat range (copper) V-Power Spark Plug	$ 2.50 (ea)

Why should you run a cold plug on supercharged and N.O.S. applications? What is a Cold plug? Click-here

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