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Guest Message by DevFuse

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Spark Plugs

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71 replies to this topic

  #11 WhiteJZX100



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Posted 22 February 2007 - 10:11 AM

Description of the NGK codes can be found here:

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  #12 mischief1



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Posted 22 February 2007 - 09:25 PM

AS for platinum, iridium or copper plugs. I find the coppers work best on modified cars, plus I'd prefer to change my cheap copper plugs ever 5,000Ks rather than trying to rely on my expensive iridium/platinum plugs to last...

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  #13 Johnhu



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Posted 23 February 2007 - 09:45 AM

One thing to consider if you want to use the copper plugs and change them every 5000km.

This obviously involves removing the coil-packs to get to the plugs. The leads and plastic
clips/plugs on the coil-packs tend to get quite brittle with age and heat. The more you have
to bend and twist them, like when removing them to get to the plugs, the more likely they are
to break.

Personally I'm happy doing a little net shopping, buying a set of irridiums, and then just replacing
them every 50,000km. Cost is about the same as 10 sets of copper plugs, and less hassle.

Just something to keep in mind anyway.
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  #14 TRD JZX100



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Posted 23 February 2007 - 10:06 AM

Fair enough, but ona a lightly modded/boosted engine the irridiums at 20, 30, 40 etc. KMs will not be anywhere as good as a fresh new set of cheapo coppers ;)

Also, every time I pull the plugs I do a bit of preventative maintenance and Silicon spray the fcuk out of my leads to keep them nice and nubile ;)

Whatever you wanna do, as long as you get the right plugs for your intended use/application you can't go wrong...

my $0.02 worth
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  #15 markiitourerv


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Posted 23 February 2007 - 10:45 PM

If your really paying that much for iridiums ($40 a plug)
then why would you????
I understand, and semi agree with you in principal that the
shear ginning around factor is worth $ alone, but at 10 times the
cost of a copper plug NO WAY.

The plugs are way to easy to change to warrant this.

Also tell your supplier to sharpen his pencil abit, as that price is
a bit over the top.

As stated, I have Denso platinums in my car and they have gone
24000 without probs.

At $10 (trade) that's OK isn't it?

Next time (I now have fmic/split dump 3" zorst, EBC),
I might go el cheapo coppers.
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  #16 Tourer_V



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Posted 24 February 2007 - 10:12 AM

as i found in my silvia, i bought a set of genuine nissan irridiums and they were gapped to 1.1mm, with the extra boost the car is making it kept misfiring, too much boost blowing the spark out, i did regap them down to .6mm and they are fine now, no missing at all, altho i dont think this would be needed in the jzx series due to the excelent ignition systems, unlike the cheap shit that nissan use ;).
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  #17 TOKYO-1



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Posted 20 October 2008 - 11:47 AM

Hi all,

I bought some oil and filter for a service and I bought plugs as well.
However, I bought the NGK-R as per the part number in the maintenance guide. These are single tips.
In my owners manual, and under my bonnet, there are pics of a single tip with a cross through it and a twin tip circled.
I'm very confused as to what plugs I should be using.
I was out sat and sun and couldn't find any twin tips.
I found quad tips from Bosch but I have heard that too many tips could help lean out the engine?????

Can anyone help me at all?
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  #18 Sim



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Posted 20 October 2008 - 12:07 PM

im running single tips in mine. running better then it was with twin tips.
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  #19 7shades



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Posted 20 October 2008 - 12:42 PM

^^^ Likewise.... (only cos none of the rednecks up here could find a listing for the twins)

That being said, its still completely stock... I'm not too savvy on what sort of difference twin VS single would make to a modified engine?
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  #20 T.S.I



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Posted 20 October 2008 - 01:54 PM

Im also curious regarding this as to what spark plugs to buy when I do a service.
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