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PostPosted: Tue Mar 13, 2012 10:57 pm 
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Location: Leicestershire
Drives: 1.6 Si
sorry if this is the wrong room



as with any used car i buy i like to give it a good service for a piece of mind this Si seems well looked after considering the recipts and oil on the dipstick is clear :0

but just wondering what spark plugs people are using in NA silvertops i know i had NGK copper core ones in my last Si which seemed great but that was some years ago and theres the new super 4 on the scene

ive been using them in my volvo turbo and seem fine (ive heard they are no good for high boost though 20+ psi) obv no problem in an NA engine

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PostPosted: Tue Mar 13, 2012 11:04 pm 
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I've heard they help the car pull better on hills

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PostPosted: Tue Mar 13, 2012 11:36 pm 
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I am running super 4's, in a C2 admittedly but they do seem to be a very good plug I can't say anything bad about them.

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PostPosted: Tue Mar 13, 2012 11:42 pm 
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ive seen a company on ebay doing them £11 + postage which is cheaper than motorfactors/halfords


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PostPosted: Wed Mar 14, 2012 2:03 pm 
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just stick with the ngk copper core, dont use champion plugs

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PostPosted: Wed Mar 14, 2012 2:59 pm 
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I just use bosch ones lol

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PostPosted: Wed Mar 14, 2012 5:45 pm 
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NGK everytime mate

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PostPosted: Sat Mar 17, 2012 12:51 am 
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ngk win win

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PostPosted: Sun Mar 18, 2012 12:10 pm 
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Did you know that there can only be one arc at a time when your spark plug fires, you will never have two, three or four electrodes fire at once. The double and quads only have an advantage if the plug becomes "fouled" on an electrode, then one of the others will be able to continue in a best case scenario - heard of the term longlife plug?

There are other things to spark plugs; heat ratings, gap setting be quite important.

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PostPosted: Sun Mar 18, 2012 1:08 pm 
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Location: Rochdale
Drives: Si 1.6 & ST170
Can't remember what's on mine but I got them from halfords.

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PostPosted: Sun Mar 18, 2012 1:09 pm 
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I currently have NGK with a heat range of 7, but I'm going for heat range 8 when I service next just for piece of mind.

Heat range is the key, don't get sucked into all the marketing nonsense.

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PostPosted: Wed Mar 28, 2012 8:51 pm 
how did ypu find out the heat range for the plug mate


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PostPosted: Wed Mar 28, 2012 8:54 pm 
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It's usually in the numbering for the code with NGK, not sure on others.

http://www.ngksparkplugs.com/tech_suppo ... ugs/p2.asp

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PostPosted: Wed Mar 28, 2012 9:14 pm 
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jam_rs wrote:
Did you know that there can only be one arc at a time when your spark plug fires, you will never have two, three or four electrodes fire at once. The double and quads only have an advantage if the plug becomes "fouled" on an electrode, then one of the others will be able to continue in a best case scenario - heard of the term longlife plug?


I knew this when I bought mine, as you say they should last longer but also its never bad to have a few routes, by definition the the route with the least resistance will work and this can vary so they can give a better spark constantly.

Either way they work well for me, but I do wonder how many do think all 4 spark at the same time.

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