"The amount of spark which is absorbed by the center and ground electrode is referred to as the quenching effect. Increased ignitability allows the engine to burn air/fuel ratios that would otherwise be too lean." This allows easier and more complete combustion of the air/fuel mixture. "NGK's unique V-Power design directs the spark to the edge of the electrode where it can develop more rapidly. Here is NGK's explanation of the V-groove:
This is because the center electrode is cut into a V shape. NGK TR55's and VX's are called V-Power plugs. The trade off is that the larger solidĬopper core will dissipate heat quicker than the Platinums, and will deliver a more reliable, more powerful spark. I estimate when driving hard, that replacement will need to come about 15K to 30K miles. The solid copper TR55's won't last near as long, but will The platinum actually won't last that long, and will break and/or burn off if you drive your LS1 hard. The NGK TR55VX plugs are the same plug, but are the platinum tipped version. These plugs match the heat range of the stock plugs and are cross-referenceable to the stockers. I chose to go with NGK TR55 Solid Copper Core plugs. The part number is S9721 and it costs about $40.00. Tools Requiredīasic tools will do, but I also chose to go with the SNAP-ON Double Swivel 5/8 6-point Spark Plug Socket. It also comes with about 7mm, carbon resistor based, plug wires. The C5 Corvette comes with Platinum Tip "100,000 Mile" AC -Delco Plugs. Spark Plug and Ignition Wire Removal and Installation C5Forum - Spark Plug and Ignition Wire Removal and Installation
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