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Discussion Starter #1
When is it worth changing the spark-plugs on a JCW?

The car has done 16k miles, would they have been changed already by now?, or when would they be due to be replaced in the future?

The JCW has ‘special’ plugs don’t they, money-no-object is it worth sticking these in again or are there any better?

What about the leads and the “spark-generator” thing on the top, would these actually make any difference to a 16k miles car?

(I don’t think the previous owner and/or dealer had been using super-unleaded so I have ran the tank dry and filled him up on V-Power, fitted an ITG filter (and removed the flap) at the weekend, so am just thinking of any other little things to do.)

Thanks, Mark.
 

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PS, the 'spark generator thing' on top is not worth worrying about. If your leads are blue then they are JCW ones and should be OK, if they are stock black then consider the blue JCWs or magnecor at some point. The JCW sparks are NGK ones and NGK make very good irridium range 7 (same heat range as JCW) for a lot less than the 'real' JCW ones. The JCWs are no better than these good NGK colder range plugs you can buy for 25 a set, not 25 each!

Should not need doing yet, but i do about 20k a year in my car and I change mine at every service for a new set, just in case.
 

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Discussion Starter #3
Thanks Richard, much appreciated.

Would the plugs be fouled at all having been run on normal unleaded?

Just wondering if it’s worth sticking a new set in as I don’t think the car needs a service for approx 8k miles which is 1.5-2 years mileage for me.

The leads are definitely black, although the JCW kit was fitted from new, should it not have the blue leads then?

Would you recommend the red Magnecor or the Live-Wire leads?

Lohen sell the Magnecor leads as well as Denso iridium plugs, are these plugs comparable to NGK?

If I’m spending X-amount on the NGK’s are there any better plugs available?

What is the difference between the JCW and the NGK plugs then, surely there must be some difference?

What is the point of the spark-generator thing then? - GTT and Vecchio both sell it/them; there must be some truth behind the hype??

Thanks, Mark
 

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OK .... maybe the blue JCW leads are off the GP, or maybe they are a JCW option not fitted to the standard JCW cars?! They defo exist as I know 2 folks with them ordered via Robert Sterns BMW/MINI in Worcester. They appear to be a better quality lead (durability wise at least) than standard black ones.

I use the red magnecor race spec leads, as thats a brand I used to use on other cars and my S is pretty tuned now. I have not used the hotwires stuff..... but Magnecor is an established brand, the youff of today might like these flashy named hotwores things but I'm an old man ;)

I don't like the Denso plugs as they have a very fine tip and I think this is scarey as it would be very easy to damage them with heat or in other ways and loose bits into the head! The NGK is a sturdier item, works well and is the same brand as MINI use as OEM I believe. Plus I have always been an NGK or Champion man in the past too. The NGK irridium range 7 (thats the impornat bit) are only £25 + postage from sparkplugs.co.uk

The JCW plugs are an NGK plug I beleive but are very expensive....for no more benifit than what can be gained from the range 7 NGKs I have described above. The NGKs and Densos are considered to pretty much be the best options out there really.... I think 1320 use a NGK plug that is used as a replacement for the Cosworth 4x4 turbos.... but its probably very similar if not the same thing as I have, I'm sure they could talk to you about the pro's and cons of their NGK and the ones I got.

There probably is some, but if your leads and plugs are good, then personally the fatness of the spark i have seen off a stock car is very good anyhow so unless your going mad on spec/tune I'd just leave the coil pack alone.
 

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Discussion Starter #5
Thanks Richard

I have used Magnecor leads in the past and am happy to use them again.

I’ve had a good search on t’net for NGK plugs and came across a particular plug that has been designed for the JCW and various Porsches: BKR73QUP, these were £60-odd for a set on sparkplugs.co.uk so a lot more than the £25 you mentioned.

Standard Part (may be Copper, Platinum or OEM Iridium)
Part Number Price (£) Per Plug Qty Per Set Buy
BKR7EQUP 14.07+vat 4


Iridium IX Part
Part Number Price (£) Per Plug Qty Per Set Buy
BKR7EIX 5.72+vat 4

What is the difference between the two?

I couldn’t seem to find much out about the range 7 though??
 

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the R7 in the part number is the heat range. You want the BKR7EIX as they are the colder than standard S irridium plugs. the EQUP are standard type plugs. The stock plug on a JCW will probably be a R7 but on the standard S its R6 (R7s are for use in hotter engines, which the JCW is due to its reduced pulley).... I'll check the boxes off my colder range irridiums when i get home tonight but I'm sure thats the part number on mine.


The ones for £60 you found are the actual JCW ones which are expensive like I said in my first post.... the BKR7EIX are perfectly good alternative for less than half the money. The ones i have are used in engines with 15-17-19% pulleys so far hotter conditions than any JCW so they will stand your engine easily.
 

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Discussion Starter #7
Thanks Richard.

I’ve learnt a lot about spark-plugs today!! And now also understand about the temperature side of things.

I’ve actually just phoned NGK because I wanted to hear from the horse’s mouth as to why the EQUP plugs are so more expensive than the EIX. The guy said that the EQUP are made in so little numbers that they have to charge more money, they are of better quality than the EIX with four electrodes but the EIX would be a worthwhile performance upgrade because the one electrode (apparently one is better than four!?) sticks out further (layman’s terms) and is made of better quality material (presumably Iridium).

So long and short of it, the EQUP are possibly going to last longer but the EIX will give better performance – and save 60% cost!!
 

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I change mine every year (but I do 20-25k of hard miles inc track and strip) but I'll lay cash on the line that the EIX would be good for more miles than that....and at half the price you can't moan.
 

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Discussion Starter #9
Thanks Richard

I actually ordered a set yesterday along with the red Magnecor lead set, should hopefully arrive in time to fit at the weekend!!

(I posted a thread with regards the air-box vacuum hose if you happen to know the answer)

Thanks again, Mark
 

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JCW Spark Plugs

Hi,

I read a BMW report saying these should be replaced every service visit., So should be F.O.C. if you are still under the TLC and XL packages.
 
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