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Thread: Ask your spark plug, wires and coil questions here Reply to Thread
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Topic Review (Newest First)
07-22-2014 06:53 AM
StephenElsbree1986 He has a 2003 like I do which clearly states 1.3mm under our hood. Also my math is completely correct.

I just typo the 1.5 over 1.3 my bad let me go edit that for you lol

1.3 divided by 25.4 = 0.051, 1mm is .03936996
07-21-2014 11:03 PM
shlbygt
Quote:
Originally Posted by StephenElsbree1986 View Post
Um .06 is a little high for ours also. I drop mine down to .05 and it feels a lot better, it depends on the power you're making how you want to gap it. Anyway stock gap is 1.5mm which is .051 in SAE you're gaping to high.....imho....
Stock gap on a 2004 SVT is 1.23mm to 1.37mm (.048" to .054").
Taken directly from the emissions decal under the hood.
1.5mm would be .059", check your math.
07-21-2014 08:03 PM
StephenElsbree1986 Um .06 is a little high for ours also. I drop mine down to .051 and it feels a lot better, it depends on the power you're making how you want to gap it. Anyway stock gap is 1.3mm which is .051 in you're gaping to high.....imho....
07-21-2014 05:01 PM
R0ckstar023 After reading through this thread I decided I should go check my spark plugs because my neighbor had gapped them when we were trying to figure out why my engine was misfiring (ended up being a broken wire in the coil pack) and I'm pretty sure he didn't gap them correctly. Sure enough, I check them today and they were only at ~.050 which would be on the low end for my (mostly) stock SVT according to what others are doing. I gapped them up to .060 and it definitely felt better even with the stock replacement plugs and the stock wires. I'm thinking next time I change the plugs I'll be going with the copper cores to see what kind of a difference that makes, and then possibly switching to some aftermarket wires since I'm sure these ones are towards the end of their lives.

EDIT: I didn't mean to say the guy didn't gap them correctly, he just didn't bother to ask where I wanted them and just kinda threw them in the car.
05-29-2014 04:08 PM
bad_haze Thanks Tom!
05-29-2014 03:27 PM
1turbofocus No you dont , on the ones that have wires going to bigger wires or coils never showed any gains , the stock wires/ coil did just as good as anything else sold

Tom
05-29-2014 12:53 PM
bad_haze I have an 07 Focus SE 2.0 Duratec. I use AR103 spark plugs gapped at 0.55". Rides nice, but I don't want to burn out my ignition or any wires, so I have a question:

NAPA says my car doesn't have plug wires - only coil over plug boots. If people are upgrading plug wires to at least 8mm to handle wider gaps on plugs, and I don't have plug wires, do I need to upgrade my coil over boots or can the stock ones handle AR103s at 0.55"?

Thanks for the advice!
05-18-2014 01:27 PM
NateV8
Quote:
Originally Posted by cheezeus View Post
Glad to hear they work well for you, I'm going to the coppers as well. Last time I changed plugs I went with the bosh +4 plats awful by the way , got them before I read this thread by 6 months so that's 40 bucks down the drain lol I'm going to try the Taylor plug wires too
I put the MSD super conductors on it when I bought it at 95000 miles. Now It is at 150k miles and still gets 36mpg highway. It idles a little rough but runs just fine.

I read on here too that bosch are horrible for the focus...

How long are the coppers good for?
05-18-2014 12:01 PM
Svteurobw
Quote:
Originally Posted by josejsanchez View Post
are their coppercore motorcrafts good for the svt?
Yes I believe that the part number is sp-463.
05-17-2014 09:39 PM
VinnyB
Quote:
Originally Posted by cheezeus View Post
Sorry it took so long to get back to you no they didn't and a heads up for everyone SP-524 is the new stock number
Gracias, sir.
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