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@AdamB

Grade 8 or 7?

Pros Cons of each in your opinion?

Their 7's mate, the grade is in the part number.

8's are way too cold for a td04, wouldn't start using 8's till like 400bhp or running exotic fuels.

Or as Stu suggested, run the copper core plugs, but they need changing more frequently.

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I'd probably change them every 25k, or every 2 services. I change my Iridiums every 25k just to keep things fresh. Inexpensive service item that gets changed regularly rules out any problems in the future :thumbsup:



Here's a little piece of tech info. Spark plugs, common item and often overlooked.


http://www.ngk.com.au/spark-plugs/technical-information/heat-range-explanation


Edited by AdamB
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  • 2 weeks later...

Horse power level and boost pressure ratio do play a part in selecting the right plug heat range, but actually it's a combination of all, more so the heat thats created from combustion. For example you could have a high compression engine producing 180hp but would still require relatively colder spark plug then a lower compression engine producing 280hp.


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Horse power level and boost pressure ratio do play a part in selecting the right plug heat range, but actually it's a combination of all, more so the heat thats created from combustion. For example you could have a high compression engine producing 180hp but would still require relatively colder spark plug then a lower compression engine producing 280hp.

That's the issue, peak cylinder pressures and temperatures. Because the 4E is so low on compression there's no need for cold spark plugs.

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