NGK Spark Plugs: DSM

Genuine NGK quality.

We're going to give you the straight goods on spark plugs for DSM applications: it has been proven over and over again, despite all the new fancy, shmancy spark plugs that come onto the scene (usually accompanied by great fanfare) that the 4G63 engine runs best on "regular" NGK spark plugs. Not platinum, not iridium, not multiple electrode, etc, etc., just plain copper electrode NGK's. You want to know the best part? They're CHEAPER than all those others. Cheaper AND work better. Can you think of a better combination? In fact, if you want any of those other fancy, schmancy ones (for a DSM application), you'll have to purchase them elsewhere, 'cause we won't sell them.

We offer several heat ranges to accomodate a variety of boost environments. We're sometimes asked "what heat range is best for my application". Well, the reality is, there are no hard and fast rules, there are simply too many variables. However, there are a few general guidlines. I suppose we should start with an explanation on just what heat ranges mean. A spark plug's heat range is basically it's ability to dissipate heat. A plug works best when operating within a certain temperature range. If it gets too hot, this can lead to pre-ignition, too cold, carbon and other deposits will tend to remain and not get burned off. So a sort of general rule is: you want the "coldest" plug that won't get fouled with deposits. Sounds simple, right? Well not really 'cause how do you know which heat range that is? The only true way of knowing is to actually run them and note their performance, presence of deposits, etc.

However, there does exist a list of general guidelines. As mentioned these are just GUIDELINES, they're not hard and true rules!

•  #6: stock or mildly modified engines running up to 15psi on stock turbo
•  #7: stock or mildly modified engines running OVER 15psi on stock (or near stock) turbo
•  #7: stock or mildly modified engines running up to 15psi on larger (but not huge) turbo
•  #8: stock or mildly modified engines running OVER 15psi on larger (but not huge) turbo
•  #8: modified engines running modest boost on big turbo
•  #9: modified engines running big boost on big turbo

 A couple of notes to above: any mechanism that tends to lower combustion chamber temps (meth injection for example) will tend to decrease the need for a colder plug. Running a turbo at boost levels higher than its intended limit will tend to increase combustion chamber temps and thus increase the need for a colder plug.

NOTE: All plugs are available in standard style or non-projecting tip style. Non-projecting tip plugs are suitable for applications where piston-to-head clearance is especially small.

Application: DSM (1990-99).
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