XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

XJS V12 Ignition Leads - what to buy?

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Old Jul 9, 2019 | 08:01 PM
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Default XJS V12 Ignition Leads - what to buy?

XJS V12 – Leads

I have done some research and there are many options.
So – lets open a can of worms and see what people recommend?

This is for a 1989 Lucas ignition V12.
I have found the following which seems like a very good price, compared to NZ.

37 pound = $70 NZD – delivered.
Would you buy these?

https://rover.ebay.com/rover/0/0/0?m...2F323466466745

I have the plugs ready to go, just need the leads and I am all set.
 
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Old Jul 9, 2019 | 08:52 PM
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The ebay ones look fine to me.
 
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Old Jul 9, 2019 | 09:20 PM
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I'm running Bosch brand, also from Ebay. I think they were about $45 US Dollars. All's well after a couple of years.

On my previous V12 I used OE 'Rists' brand and they worked perfectly well, too. About $50 US Dollars 15 years ago or more

Lots of guys prefer Magnacore. High end, as far as plug wires go, I think they're $100 or more

Cheers
DD
 
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Old Jul 10, 2019 | 12:56 AM
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With Doug on this.

Been Magnecor for a very long time, but they have become greedy.

Bosch on the last one, and 7mm, as 8mm gets way too messy for my liking, and not really needed.
 
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Old Jul 10, 2019 | 12:57 AM
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What is so special about Magnacore leads, and why do i want to pay the extra.... which by the way i do not want to pay...UNLESS these is a good reason.
I have no problem paying for quality, if it is worth it!

Looking forward to the WHY...Magnacore leads.
 
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Old Jul 10, 2019 | 01:14 AM
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Thanks Grant, that is perfect.
Now to find some Bosch... leads.

I have a Bosch dish washer, best ever. But still went AEG for washing machine / Dryer
 
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Old Jul 10, 2019 | 01:19 AM
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OK looking on Ebay, Bosch $155 landed to NZ or my first post $70.
Why would I spend the extra?
That is my question.......... tell me and i will spend!
 
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Old Jul 10, 2019 | 01:23 AM
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It gets worse... 1976 - 82 really. what changed before 90 with the fire system?
Did they forget 89..LOL
https://www.ebay.com/itm/BOSCH-IGNIT...UAAOSwA3dYEb4m
 
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Old Jul 10, 2019 | 01:42 AM
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OK, MY opinion.

I fitted Magnecor to all the S2 6cyl, Real S Type, MK10, cars waaaaaay back, 25+ years at least.

Still there and fine, as I still maintain 3 of those cars.

The V12's ALL got Magnecor, $55 a set back then, AND, the ONLY supplier that supplied the 90deg for 1A & B, and 6B, and 5A, AT the plug end. Straights at those #s for plug end are doable, but 90deg, sooooo simple. Some of them are 20+ years old, and done mega kms, and lots of plug changes.

Th last set, Bosch, were 90deg at the cap, standard, and straights only at the plugs, but that car has a compact Sanden A/C compressor, so easy as. The othrs we made them fit.

The Magnecor supplier in those days was in the next suburb to me, and he actually knew what the HE needed, and number tagged each lead. Sadly, they be gone now. What they supply now, I dont know.
 
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Old Jul 10, 2019 | 07:30 AM
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Originally Posted by Dukejag
Thanks Grant, that is perfect.
Now to find some Bosch... leads.
Don't limit yourself to just Bosch

In 5 minutes of Googling I've found several sets of V12 plug wires from $35-$55

NGK, Denso, Beck Arnley, AC Delco

Not sure what available in your neck of the woods, though

Cheers
DD
 
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Old Jul 10, 2019 | 08:36 AM
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Originally Posted by Dukejag
It gets worse... 1976 - 82 really. what changed before 90 with the fire system?
Did they forget 89..LOL
https://www.ebay.com/itm/BOSCH-IGNIT...UAAOSwA3dYEb4m
HAHAHAHA, welcome to the AFTERMARKET world that I have worked in for 55 years.

Their listings are worse than a politicians promise list, and I gave up years ago trying to get them to sort anything.

PreHE V12 are different, coz the plugs are at different angles,AND, Straight at the plug ends IS needed, no exceptions. Also the lengths are "slightly" different on some due to those plug angles.

NGK, AC Delco etc, as Doug has mentioned, are all excellent leads.

Plug leads have come a looong way in the last 8 or so years.

It will get messier in a few years as the COP market takes over, and plug leads become a supply and demand item, and then stocks and prices will get scary. Some markets more so than others.
 
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Old Dec 16, 2019 | 01:51 PM
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Has anyone looked at colored ignition leads? I was thinking of getting some red ones to add a splash of color to the engine bay. I don't know, maybe I've been watching too many episodes of "Pimp My Ride..."

There is a vendor on eBay called "Mr Retro Leads" who claims to make the leads at a workshop in the UK. He claims they are wound wire leads with Kevlar core with a nominal resistance of 5.6kOhm.

At a price of 55 GBP, it won't kill me if I end up having to throw them away, but thought I would ask this group for any comments on functionality and aesthetics.
 
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Old Dec 16, 2019 | 03:54 PM
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Wire leads are for points systems, you'll get a lot of electrical noise out of those. Stick to modern silicone wires and you'll be fine.
 
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Old Dec 17, 2019 | 01:19 AM
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I use these:
https://www.formulapower.com/
They are absolutely great, if a bit bulky; but they make an 8mm version too,
 
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Old Dec 17, 2019 | 05:22 AM
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Thanks for the recommendation. Is there a performance difference between the 8 and 10 mm?
 
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Old Dec 17, 2019 | 07:37 AM
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Originally Posted by Hedman
Thanks for the recommendation. Is there a performance difference between the 8 and 10 mm?
I honestly do not know, but my car started and ran better with them than the OEMs I had on before.
 
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Old May 9, 2020 | 02:24 PM
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Default Colored HT leads

Finally got around to installing new HT leads. I chose red to add a dash of color to the engine bay.

I ended up getting 8.5 mm leads as I was concerned that the 10 mm version would be harder to fit.

Saw an an immediate improvement in engine performance over the old leads — due to the fact that I had inadvertently pulled one of the old leads loose when reinstalling the injectors and fuel rail!

Could have done a tidier job routing the leads if I had done this when the fuel rail was out the first time.



 
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Old May 9, 2020 | 06:37 PM
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The red looks pretty good. I was not too sure when you first mentioned it. On the general subject of ignition leads, yes, pre HE and HE take different leads, so get what is correct for your engine. Beyond that, almost any leads work the first time around. The real difference comes in later. Cheap wires tend to pull apart easily when you try to disconnect them many miles later. You have to disconnect them very carefully. They are also less resistant to chafe, and will wear and short out easier than more expensive leads. That said, I have had very good luck with cheap leads.
 
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Old May 9, 2020 | 08:13 PM
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I have some Denso 8mm that I haven't put on yet, sitting next to the dozen NGK spark plugs I bought. I put in my year, make, and model, and these are what Summit Racing's search engine spit out. I have to get the Benz back together before I put the Jag back in the garage, so we might find out how they do next weekend. Or the weekend after that...
 
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