spark plug indexing

[Asus700]

may nakasubok na ba sa inyo?

where did you buy your spark plug copper washers?

thanks po.

[spyghost]

i wanted to try, pero di ko alam kung san merong washers. eto lang naman ang tingin kong problema e

[v6dreamer]

Locating the plug in the head for optimal ignition.



Highlights:Before we dig into spark plug indexing, we should point out that every engine responds differently to indexed spark plugs. Why? The shape of the combustion chamber, the shape of the piston dome, the type of ignition system and many other variables influence the "location" of the spark plug in the cylinder head. In engines that feature a healthy piston dome coupled with a tight combustion chamber, indexed spark plugs are almost mandatory because the close internal clearances "tighten" the spark plug gap every time the piston comes to top-dead-center (TDC). When it comes to performance, some engine combinations simply respond better to indexed spark plugs than others. | What Is Indexing? | How To Index | Power GainsStep-By-Step:1 | 2 | 3
Indexing spark plugs sounds high-tech. But what is it and what good does it do?
Before we dig into spark plug indexing, we should point out that every engine responds differently to indexed spark plugs. Why? The shape of the combustion chamber, the shape of the piston dome, the type of ignition system and many other variables influence the "location" of the spark plug in the cylinder head. In engines that feature a healthy piston dome coupled with a tight combustion chamber, indexed spark plugs are almost mandatory because the close internal clearances "tighten" the spark plug gap every time the piston comes to top-dead-center (TDC). When it comes to performance, some engine combinations simply respond better to indexed spark plugs than other.

"What Is Indexing?"
Generally speaking, the idea of indexing is to position the spark plug so that its gap is facing the center of the cylinder, angled slightly toward the exhaust valve—the most common arrangement. (Some engines work better with other gap locations.) This is important because, as the piston approaches TDC, the air/fuel charge is being compressed. The charge or "mixture" is being forced toward the area of the spark plug—and normally, the exhaust valve. The true speed of this force inside the combustion chamber is extremely fast. Some experts speculate that it surpasses supersonic speeds.
Because of this, the spark generated from the plug should be in a "position" to create the best possible flame front. Looking at a typical side-gap spark plug, you'll note that the electrode can actually block the flame process. On the other hand, if the electrode gap faces the on-rushing air/fuel charge, it stands a much better chance of igniting a flame front.

"How To Index"
How is a spark plug indexed? Simple: Mark the spark plug insulator body with a felt marker (never use a pencil, which acts the same as a carbon track inside your distributor cap) on the side where the ground electrode attaches to the spark plug body. Instead of rummaging through boxes of spark plugs to find the elusive combination of perfect plug threads that match the cylinder head threads, use indexing washers. These soft copper washers are available from the aftermarket and will fit both flat- and tapered- seat spark plugs. They're available in three thicknesses: 0.060-inch, 0.080-inch and 0.100-inch.
Copper's inherent softness along with the various washer thicknesses make it simple to thread the spark plug into the cylinder head and tighten it to the point that the index mark is situated in the correct position relative to the combustion chamber. (Never double up washers; they aren't intended to be used in tandem.)

"Power Gains"
Real-world power gains vary. Some engines or combinations respond differently than others. In fact, all engines will pick up power, but some gains will be more dramatic than others.
In the end, it can't hurt to index the spark plugs. This can contribute to superior engine efficiency and improved economy.

[spyghost]

san kaya me washer dito sa pinas na pang spark plugs? i'm not after the hp thing, im more on getting a better burn