I agree with Lew.

electricity travels on the OUTSIDE of a conductor. a large-diameter center electrode, even if made of copper, will flow more electricity than a narrower center electrode (thin platinum). Motorcraft plugs are your best bet.
IMO Ford racing wires are 9mm which is fine. As long as your wires are kept from lying on the valve covers or engine block you won't have any problems with arc'ing.

As for ignitions...I'm always partial to Mallory, but that's a whole other thread!

 

The electrode is not made of copper - only the core of the electrode is copper, and it is there primarily for heat dissipation rather than electrical conductivity. This is a common misconception that I see repeated here quite often. The center electrode would wear much too fast if the copper was exposed to the combustion chamber. The spark does jump from sharp edges, which would be on the outside of the electrode tip, but there isn't much of an electrical current jumping the gap - it is more dependent on voltage than anything else.

NGK Spark Plugs - Including Iridium IX - Quality Replacement NGK Sparkplugs
Spark Plug Construction

I also read the same information on center electrodes in Bosch literature as well. The heat dissipation is the reason "platinum" plugs also have a copper core in the center electrode - the platinum is just a plating on the spark faces of the electrodes to make the plug last longer. Platinum doesn't wear as fast as the nickel alloy used in standard plugs.

 

I have the 6al with TFI coil....easy to install. I also have the 9mm Ford Racing wires and find the length to be perfect allowing room to route without worrying about interference. Running Motorcraft copper plugs gapped to .050 and plugs are perfectly clean. Plugs stay super clean with the high energy ignitions. My '95 Bug2 PCM has factory rev settings of 5350 rpm. You have no need for 6al unless you want a rev limiter less than factory settings. If you want more than factory settings, this can only be attained through changing settings in the pcm with chip/qh/or tweecer type device.

 

You really think the Ford Racing wires are the prefect length? They are inches longer than the Motocraft or Accel wires and hang loosely. They look to me like they were made for a 460. I'd rather have the BWD wires from Orielly. Also, I would rather have 8mm wires that don't require the massive bulky wire separators. I think some of the other wires are available in 8.5 which may work in the smaller separators.

 

I use the term "perfect" loosely...lol...they work fine for me. I like a little extra so that I can route how I like. I used the stock separators on my 9mm wires.

 

I don't see how you used the stock wire separators on the Ford Racing wires. The wires are much too large. Did you force them into the separator and pinch them? Are we talking about the same spark plug wires? I'm talking about these. They are about the worst fitting kit I have seen.

http://www.summitracing.com/parts/FMS-M-12259-C301/

 

Thanks for that bit of info, TexasGuy! I was just about to order a set of those wires, but after hearing that, I am going to go back with a good set of Motorcraft replacement wires.

 

I use the MSD 31329 8.5 super conductor made for the mustang , they are a little longer for routing around headers , ( racing wires ) a good set of wires and coil is important for a good spark , alot of guys use them with the 6 liter tune up ....Lew

 

Your welcome. If you have a 5.0, I believe the wires you will want are WR-4093. The other number on the box is F4PZ-12259-D. These are what I have. Also, if you need the wire separators that clip on to the valve cover bolts they are available in the HELP secion at Orielly and Advance. The other wire separators are usually in that section too.

You can get the wires from Summit or sometimes Ebay for a good price. Advance wanted 50 bucks I think. The dealer wants over 100 dollars.

http://www.summitracing.com/parts/ACF-WR4093/

 

Yep, my wires are the blue 9mm FMS Racing wires. They may or may not have been the stock separators, as wires were not stock....they were Taylors, but the separators work fine. I like the little extra length....like Lew said....to work around headers, etc. I can't stand a wire that is too short and gets scorched by headers. I'll show pics of mine if I get a chance, I don't think they are that bad. There wasn't much difference between them and the Taylors that came off...as far as length. The back wires are probably a little longer than they need to be. You could get one of the kits where you have to make up the final length....those are fun.

 

I have an MSD distributor, box, coil, wires, and E3 plugs and it ran great until it blew.

 

Just curious, was your engine stock or modified?

I wouldn't buy the KN or the gimmicky E3 plugs they are made in China.

 

Other than the MSD, a K&N, and a cat back it was stock before it blew.

 

So the MSD 6A ignition systems are universal, or is there a specfic sub model I need to get? I just ordered some NGK IX Iridium spark plugs and Ford Racing wires to supplement the SuperChip, K&N, and Flowmaster exhaust. I'm thinking the MSD 6A would be a great next step.

 

A good coil and wires is all you really need to get a good spark , the MSD 6A-6AL ignition boxes are good for using rev limiters , timing advance and retard and other electronics.....Lew