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Not the most mechanically inclined here. Can anyone tell me what's the difference between NGK Spark Plugs-CR9EHI-9 and CR9EHIX-9


ICE
 

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Ice : Not the most mechanically inclined here. Can anyone tell me what's the difference between NGK Spark Plugs-CR9EHI-9 and CR9EHIX-9


ICE
About $0.75 cents per plug Just kidding, I dont know, they are both iridium, but the do have different NGK stock numbers so something is different, possable electrode sixe/shape, or thread length or something.
 

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The HIX:

10mm, 3/4' reach, 5/8' hex, gasket seat, resistor, partial thread, fine wire (0.6mm) iridium center electrode, tapered cut ground electrode, 0.36'gap

NGK iridium plugs represent the ultimate evolution of spark plug technology and performance. The iridium center electrode is both stronger and harder than platinum. This allows NGK engineers to design an ultra-fine (0.6mm)center electrode reducing the voltage requirement for spark. This allows for a brighter, stronger spark from your existing ignition system. The ground electrode has a tapered cut at the firing end which reduces quenching for better flame core growth and increased ignitability. The combination of fine wire center electrode and tapered cut ground will increase performance, improve acceleration, and fuel efficiency.

The HI:

10mm, 3/4' reach, 5/8' hex, gasket seat, resistor, partial thread, iridium center electrode, 0.36'gap

NGK iridium plugs represent the ultimate evolution of spark plug technology and performance. The iridium center electrode is both stronger and harder than platinum. This allows NGK engineers to design an ultra-fine (0.6mm)center electrode reducing the voltage requirement for spark. This allows for a brighter, stronger spark from your existing ignition system. Traditional ground electrode.

Yup, looks like im right, different electrode shape.
 
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