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These plugs match the heat range of the stock plugs and are cross-referenceable to the stockers.
The NGK TR55VX plugs are the same plug, but are the platinum tipped version. They have a thinner copper core. The platinum actually won't last that long, and will break and/or burn off if you drive your LS1 hard.
The solid copper TR55's won't last near as long, but will provide better performance. Replacement may need to come about 15K to 30K miles.
The trade off is that the larger solid copper core will dissipate heat quicker than the Platinums, and will deliver a more reliable, more powerful spark. Platinums are strictly for longevity.
NGK TR55's and VX's are called V-Power plugs. This is because the center electrode is cut into a V shape.
Here is NGK's explanation of the V-groove:
"NGK's unique V-Power design directs the spark to the edge of the electrode where it can develop more rapidly. This allows easier and more complete combustion of the air/fuel mixture. The increased ability for ignition allows the engine to burn air/fuel ratios that would otherwise be too lean."
"The amount of spark which is absorbed by the center and ground electrode is referred to as the quenching effect. The V-Power plug is designed to draw spark to the edge of the electrode. Thus, the quenching effect is minimized, resulting in more effective, complete combustion."
If you run your engine hard in a very hot climate, and/or are running nitrous or forced induction, then the TR6 (see part# TR6) is a better plug, because of its colder heat range. Consult with your tuner for best gapping etc...
All the above is gleamed from the C5Forum.com site and slightly modified for correct spelling and content so as not to make it sound like I wrote it. Phil |
