ngk sparkplugs

[05Wh!t3BomB]

i need new 1s so i looked at ngk.. whitch is better stock heat or colder.. alot of ppl say get colder.. im also going to get the 180stat.. so i should go colder right

[Turbocruiser13]

A good rule of thumb is for every hundred horsepower you add, you should go a step colder. So if you're lookin in the low 300whp range, 1 step colder would work. If you're lookin for 380+ 2 steps colder. The NGK 4306 is a damn good plug and it should do the job just fine if you're still stock turbo.

[05Wh!t3BomB]

Quote: Originally Posted by Turbocruiser13

A good rule of thumb is for every hundred horsepower you add, you should go a step colder. So if you're lookin in the low 300whp range, 1 step colder would work. If you're lookin for 380+ 2 steps colder. The NGK 4306 is a damn good plug and it should do the job just fine if you're still stock turbo.

well ill be under the 300s 4 a while till i buy my agp50trim dbb kit.. so i guess its the 1step colder thanx

[RACESRTX]

SPARK PLUG HEAT RANGE

The "heat range" of a spark plug determines how hot the plug runs during normal operation. If the heat range is correctly matched to the engine application, the plug will run hot enough under normal driving conditions to burn off fouling deposits before they can cause problems. Likewise, the plug will not get too hot and become a source of ignition causing engine-damaging preignition and detonation. If the heat range is too cool for the application, though, fouling deposits may build up faster than they are burned off.

For this reason, always follow the vehicle manufacturer or plug supplier heat range recommendations when selecting a spark plug for a particular application. Two spark plugs may appear to be identical on the outside but have entirely different heat ranges.

There are situations, though, that may require a slightly hotter or colder plug than the one normally recommended. Switching to a slightly hotter plug can help reduce fouling in an older engine that uses oil, for an engine that spends a lot of time idling or is used for short trip stop-and-go driving. But a hotter plug should not be used unless an engine is experiencing a fouling problem because of the increased risk of preignition and detonation.

For performance applications (racing, or engines that are run under heavier than normal loads or at high rpm for sustained periods of time), switching to a slightly colder plug can minimize the risk of preignition and detonation. Even so, a colder plug can increase the risk of fouling with extended idling and low speed operation.

Many of today's spark plugs have a very broad heat range because the plug manufacturer uses a copper core or platinum center electrode. Copper is an excellent conductor of heat, so the insulator can be designed to run hotter and burn off fouling deposits without it getting too hot under increased load to cause preignition or detonation. A solid platinum center electrode will also carry heat away from the tip, but not if the electrode only has a platinum tip.

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