Which type sparkplug for Ford?
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
Originally Posted by MisterCMK
copper core plugs are the best for N2O and forced induction because it produces a "hotter" spark since it is a better conductor of electricity.
I only use Autolites or Motorcraft plugs in my Fords.
I only use Autolites or Motorcraft plugs in my Fords.
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
Originally Posted by Fifty4F100
Would "primary side" be what slides on the plug?
Fleet Owner
Joined: Mar 2003
Posts: 24,724
Likes: 74
From: Blue Hill Township
Originally Posted by Bob Ayers
Not true, the difference in electrode "effective" series resistance will be about 0.1 OHM between platinum, and copper plugs.
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
Originally Posted by MisterCMK
Then why does everyone recommend copper plugs over platinum, iridium, etc plugs for forced induction and N2O applications?
Last edited by Bob Ayers; Nov 28, 2006 at 11:31 AM.
Laughing Gas
Joined: Feb 2003
Posts: 1,242
Likes: 2
From: Bartlett, TN
Originally Posted by Bob Ayers
The "primary side" will be the 2 top electrical connections. For the "secondary side" just measure between the spark plug connector, and either of the primary connections.
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
Originally Posted by Fifty4F100
What I got 5 - 4 ohms off of was the 2 terminal ends inside the connector. I didn't get a reading from one of these ends and the plug fitting.
Laughing Gas
Joined: Feb 2003
Posts: 1,242
Likes: 2
From: Bartlett, TN
Originally Posted by Bob Ayers
What ohms range were you using? The reading will be several K (1000's) of ohms on the secondard side.....
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
Originally Posted by Fifty4F100
I was using my wife/computer engineer/reader-of-the-meter person. Remember I am electrical illiterate. I think the meter (an old analog unit) was set to single units. The coil was off the truck.
New User
Joined: Nov 2006
Posts: 10
Likes: 0
From: Houston TX it's to darn
not getting in on this one... however I have had about three of the several mechanics that I have consulted in, and they said that Bosch plugs seem to disagree with fords...
I personally just replaced motorcraft with autolites
I personally just replaced motorcraft with autolites
Freshman User
Joined: Feb 2003
Posts: 40
Likes: 0
The "primary side" will be the 2 top electrical connections. For the "secondary side" just measure between the spark plug connector, and either of the primary connections.
Laughing Gas
Joined: Feb 2003
Posts: 1,242
Likes: 2
From: Bartlett, TN
Originally Posted by Bob Ayers
That explains why it measured "OPEN". If you put your meter on a higher OHMS range, then you should get a reading....
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
Originally Posted by Fifty4F100
What do you mean by "OPEN"? It did measure 4 - 5 ohms.
Laughing Gas
Joined: Feb 2003
Posts: 1,242
Likes: 2
From: Bartlett, TN
Originally Posted by Bob Ayers
You said you didn't get a reading when doing a "secondary" measurement. This usually means an "open" circuit.....
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
Originally Posted by Fifty4F100
I wasn't very clear on that - I didn't get a reading because I didn't "take" a reading. I didn't know to check there for resistance. But I'm still running good so I'm good!