I walk into Advance Auto Parts and ask if they have NGKs for my '89. He looks it up and it lists only one type of NGKs, the VPower ZFR5D-11, model number 4936. Of course none of the advance auto's around has ever had them in stock so I agree to special order them. They came and then I get all disappointed when there's obviously no V cut into them. I look at the receipt, it says VPower on it; I look at the boxes, they say the right model number. So I just sit there for 10 minutes trying to decide how much trouble are 4 plugs worth.
Later tonight, I look up NGK's website and their part's finder sure thing lists the VPower ZFR5D-11 as the ones for the '89 and their picture looks exactly like what I got, a flat non V plug. Then I look at the '90 and they list the VPower ZFR5E-11 and G-Power Platinum ZFR5EGP. The picture of the ZFR5E-11's do have a V in them.
So now I'm wondering, what gives? Why do the two years have different spark plugs, when they have the same engine? What exactly is so different between the ZFR5D-11's and ZFR5E-11's? Can an '89 use ZFR5E-11's? Just how many different sizes of spark plugs do they make? Why the heck does NGK even call the ZFR5D-11's, V-Power when there's no V in them?
Why do '89 and '90 240sx KA engines take different spark plugs?
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sparkplugs.com
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Re: (NISTECH)
i'd be careful - the d at the end means its a special design plug. While this makes no sense to me whatsoever, i'd call ngk's tech to make sure you can swap the plugs - the special designs are there for a reason. Jon's # is 877-473-6767, #2.
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s13sr20chris
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Re: (sparkplugs.com)
the 89 and 90 had different compression ratios. the higher dome on the 89 may have required a shorter plug. if that is the case... using the regular e-11 may cause plug to piston contact. i doubt it but its possible.