How-To: Cut and Loom Your Own Spark Plug Wires to the Perfect Length

Paul

Legend
Joined
Apr 30, 2007
Messages
9,894
Reaction score
247
Over the years I've made up lots of plug wire sets for myself and friends of mine. It can help give your motor that extra little attention to detail that can set it apart from everyone else, and give it a nice clean look.

In this article I'll show you step-by-step how to do this. It's pretty simple, and just takes a little time and patience. Of course, you'll need to go out and buy another special tool for this job. Here's what you'll need to pull this off:
  • A pair of medium-size wire cutters
  • A pair of pliers
  • A special spark plug terminal crimping tool

My crimping tool is from MSD - Part Number 3505.  This is available from lots of places on the internet; just type the PN into www.froogle.com and pick your merchant. :) This is a great professional-quality crimper. You can also buy all kinds of jaw inserts for many other types of crimping applications. The tool is shown below.

Crimp_Tool.JPG


I used some FRPP wires because they were the right color, and the right price. :) I removed all the lettering on them with brake cleaner and a towel. These are great wires, but they come a bit long and I wasn't satisfied with the fitment. Since these wires already had ends on them, I had to cut them off and install some new ones I picked up from a local performance shop.

Lots of plug wires are available from manufacturers like MSD, Taylor, Moroso, LiveWires, etc. Many of these companies offer kits without the terminals installed so you can cut and crimp them to fit your motor perfectly. That's what we're going to do in this article.

So down to business... You need to mock up all your spark plug wires in their respective locations. Starting at the post marked #1 on the distributor cap and moving counter-clockwise, the order is 1-3-7-2-6-5-4-8. You can mark the cap with a sharpie or scratch the numbers in with an awl if it helps you.

Here are my passenger side wires loose.
Passenger_Side_Wires_Loose.JPG


...and the driver side wires just after I started looming them with zip ties.
Driver_Side_Wires_Loose.JPG


Since I don't have tons of money for fancy billet plug wire separators, I just use zip ties. It may not be as fancy but it comes out looking pretty clean and it's a lot cheaper! Simply wrap a medium size zip tie around the plug wires, and then a smaller one goes around the medium one between each plug wire.

Starting from the spark plugs, carefully loom up the plug wires moving toward the distributor so they fit exactly how you like them.  You'll have a bunch of wire hanging over at the distributor cap, but that's okay - we'll fix that later.

Here's what mine looked like when I was done looming up the passenger side.
Driver_Side_Wires_Loomed.JPG


Now you need to starting cutting the plug wires to length and installing the new terminals. As I mentioned earlier, I used FRPP wires which already have ends installed. You can simply pull the rubber boot off the end that attaches to the distributor and it will look like this.
Old_Terminal.JPG


If you want, go ahead and snap it onto the distributor so you can see how they fit.
Old_Terminal_Attached.JPG


Here are the new terminals I picked up.  I think these are from MSD.  These are the correct ones for the distributor end of your 5.0 Ford. If you're making wires for a different kind of car, make sure that you get the correct terminals for your application.
New_Terminals.JPG


Now that your plug wires are loomed up and you've got your terminals ready, you can mock up the wires on the distributor cap and cut them to length. In this picture, the left wire (which I'm holding) is going to the "bottom" exposed post, and the wire right next to it is going to the post above it. Use your wire cutters to cut the plug wire about 1/2" past the terminal.
Mock_Up_and_Measure_Wires.JPG


Then put the cut wire in your crimping tool, and strip off the insulation with the cutting part of the tool with a hole in it.
Plug_Wire_Ready_to_Strip.JPG


Once the insulation is stripped, it will expose the actual wire that conducts spark to your spark plugs. It will look like this:
Plug_Wire_Stripped.JPG


Now fold that wire over back onto the insulated part of the plug wire, and put the new terminal loosely on the end. I always "pinch" the new terminal a little bit with some pliers first - but only just enough so that it is snug and will hold itself onto the plug wire. Here's what it should look like:
Terminal_Loosely_Fitted_Bottom.JPG


Here's a somewhat blurry picture from the side:
Terminal_Loosely_Fitted_Side.JPG


You can re-check your fitment by mocking up the plug wire on your distributor, and make any adjustments as necessary.
Terminal_Loosely_Fitted_Snapped.JPG


Once you're satisfied with the fit, go ahead and put the end of the wire with the terminal on it into your crimping tool. The closed end is on the bottom of the tool with the round surface, and the open end goes up toward the part of the tool with the small point in the middle.
Terminal_in_Crimp_Tool.JPG


Now just squeeze the handle on the tool, and it will be crimped.
Terminal_Crimped.JPG


All you have to do now is put the rubber boot back on with the open end of the terminal pointed toward the open end of the boot. Make sure you get it lined up right before pushing it back into the boot. I usually use a quick spray of WD40 to make them go in easier.

Now just repeat that seven more times for the plug wires, and twice on the ignition coil wire (both ends) and you're done! Here's what my wires looked like all done:
Driver_Side_Wires_Complete.JPG

Engine_Two.JPG

Engine_Six.JPG

Engine_Five.JPG


You're done! Great job! Now you can charge your friends to do this for them to help pay for the cost of the crimping tool!! :) Plus you'll have the cleanest plug wire setup on the block.

Paul.
 

Dr Fildo

Active Member
Joined
Jul 1, 2008
Messages
303
Reaction score
3
Location
Jersey
Didn't even think to do this, but it looks so easy. And the zip tie tip is priceless!
 

fixthedoor

Well-Known Member
Joined
Jan 26, 2006
Messages
1,904
Reaction score
0
You are missing the proverbial disclaimer about doing this at your own risk, yada yada.

Good write up. The info on the zip tie wire looms and wire stripping was nice to see.
 

Dalamar

Post Whore
SN95 Supporter
Joined
Feb 3, 2006
Messages
13,863
Reaction score
124
Location
SLC, UT
Great write up Paul, with pics and helpful tips!





What's with that funny motor that's all gray and shiny?

do you know what the difference is, if any, on coil pack wires?
 
OP
OP
P

Paul

Legend
Joined
Apr 30, 2007
Messages
9,894
Reaction score
247
Dalamar said:
What's with that funny motor that's all gray and shiny?

It's mostly just a garage ornament. Neato but useles..

do you know what the difference is, if any, on coil pack wires?

Sorry Jeff, I have no idea how the coil pack stuff works. I've never really worked on a modular in my whole life. You need to get a 94-95 so I can be more helpful. :)

Paul.
 

idro

Member
Joined
Apr 23, 2008
Messages
240
Reaction score
0
thanks for explaining the ziptie trick man, i will use it this week when i am putting my motor back together. :eek:ccasion14:
 
OP
OP
P

Paul

Legend
Joined
Apr 30, 2007
Messages
9,894
Reaction score
247
I'm eventually going to organize all of this stuff into a tech article section on the main page. All of it will be in PDF format so people can print out the articles and use them in the garage. I'm also working on getting the forums re-arranged a bit so stuff is easier to search and find for everyone. I have lots of broken cars so there's plenty to do. LOL
 

duh09

Legend
SN95 Supporter
Joined
Apr 23, 2008
Messages
9,554
Reaction score
599
Location
Memphis-ish
That ziptie awesome is a helluva a lot cleaner looking than anything i've seen so far
 
OP
OP
P

Paul

Legend
Joined
Apr 30, 2007
Messages
9,894
Reaction score
247
duh09 said:
That ziptie awesome is a helluva a lot cleaner looking than anything i've seen so far

Haha, I know right? I can't tell you how many people how asked me how I did that. They were pretty surprised when they found out it was fifty cents worth of zip ties. LOL

So now, I give my super mystery solution to all of you, my SN95 homies. :)

Paul.
 

BlkoutGT

Well-Known Member
Joined
May 16, 2007
Messages
1,069
Reaction score
8
Location
MO
Awsome write up man! the zip ties are just too easy :eek:ccasion14:
 

duh09

Legend
SN95 Supporter
Joined
Apr 23, 2008
Messages
9,554
Reaction score
599
Location
Memphis-ish
Paul said:
duh09 said:
That ziptie awesome is a helluva a lot cleaner looking than anything i've seen so far

Haha, I know right? I can't tell you how many people how asked me how I did that. They were pretty surprised when they found out it was fifty cents worth of zip ties. LOL

So now, I give my super mystery solution to all of you, my SN95 homies. :)

Paul.

Its nice that I have a giant can of them too. I've seriously been tryin to figure out what to replace my blue ford ones with since I'm about to get red wires and the blue would look weird... thats perfect... I'm either gonna do this or paint the ones I have glossy black.... who knows?
 

fastgtfairlane

Active Member
Joined
May 20, 2007
Messages
971
Reaction score
0
ive custom cut many a set of plug wires. i dont have a crimp tool just not quite as easy to bend the terminals with out them. thats why ive never burned a set with my equal lengths. plus shorter wires equals less resistance to the spark plugs. also, i try to make every wire as close to the same length as possible to make every cylinder equal for maximum efficiency
 

5.Woahhh

Well-Known Member
Joined
Mar 19, 2008
Messages
1,692
Reaction score
0
Though I am driving a Mod motor now, great write up Paul. That motor is sex.
 

NERD

Well-Known Member
Joined
Dec 28, 2006
Messages
3,066
Reaction score
21
Location
Virginia
Good write up. I tried cutting up my stock wire but nothing good came of it. lol. Stupid Modulars, lol.
 

Latest posts

Forum statistics

Threads
77,492
Messages
1,503,732
Members
14,964
Latest member
bs.austin.tx

Members online

Top