+ Reply to Thread
Results 1 to 24 of 24

Thread: Difference between 7mm and 8mm spark plug wires

Hybrid View

  1. #1

    Senior Member

    Status
    Offline
    Join Date
    Mar 2011
    Location
    Hopkinsville, Ky
    Posts
    186

    Default Difference between 7mm and 8mm spark plug wires

    What is the difference between 7mm spark plug wires and 8mm? 7mm is the factory size, and Ive read on here recently that 8.5 is too big without an upgraded ignition system. I was just curious because I have read on here that everyone uses 8mm, so I went to several stores around here to get the 8mm ones and no body carries them, they have to order them in. I was just wanting to know the difference before I have anyone order them or I buy the 7mm ones. Thanks
    My daily driver, 14x3 open element filter, shorty headers, cat-delete, magnaflow y-pipe, 3 inch pipe from y-pipe back to spintech 6000 pro street series muffler

  2. #2



    grapejuice1998's Avatar
    Send Lawyers Guns & Money

    Status
    Offline
    Join Date
    Jan 2008
    Location
    Dallas, TX
    Posts
    9,739

    Default

    The difference is 1mm. You can thank me later.


    BTW-I use the 7mm Mopar wires on my 408. They work great!
    Alan Short
    D.R.T.C. #15


  3. #3

    y2krtaf's Avatar
    Senior Member

    Status
    Offline
    Join Date
    Jan 2008
    Location
    Phoenix, Az
    Posts
    3,472

    Default

    Quote Originally Posted by grapejuice1998 View Post
    The difference is 1mm. You can thank me later.


    BTW-I use the 7mm Mopar wires on my 408. They work great!
    LOL

    Ya beat me to it!

  4. #4

    Senior Member

    Status
    Offline
    Join Date
    Mar 2011
    Location
    Hopkinsville, Ky
    Posts
    186

    Default

    LOL ok, I figured that much, I was just wondering if there really is an advantage to them. Thanks for the super easy answer lol
    My daily driver, 14x3 open element filter, shorty headers, cat-delete, magnaflow y-pipe, 3 inch pipe from y-pipe back to spintech 6000 pro street series muffler

  5. #5

    I like free kittens

    Status
    Offline
    Join Date
    Jul 2011
    Location
    Marysville O-H-I-O
    Posts
    7,077

    Default

    I'd think the resistance per foot is more important than the diameter of the wire.

    For what it's worth, I really like the firecore 50s, and won't buy another brand wire again. Great fit, they feel good in my hand, and you can feel them "click" into place and there's no question on whiter they're on or not, plus I know the owner, Rick. Great guy, awesome customer service, and he's a mopar guy too. Owns a rare 71 GTX w a factory sunroof option. And he's right here in Ohio. Stop by his trailer at Carlisle, Nats and other races, Rick will offer you a beer, shoot the bull, and flat out take care of you.
    --Tom
    **Photobucket can suck my nut**

    I'm a douchebag

  6. #6


    ScojoDak's Avatar
    Black Pearl

    Status
    Offline
    Join Date
    Aug 2008
    Location
    Kingman, Az
    Posts
    2,795

    Default

    Quote Originally Posted by 70Cuda383 View Post
    For what it's worth, I really like the firecore 50s, and won't buy another brand wire again. Great fit, they feel good in my hand, and you can feel them "click" into place and there's no question on whiter they're on or not.
    Plus he makes them a tad longer so wire looms can be used for a clean look.
    If you haven't lived for something, you'll die for nothing.

  7. #7
    360magRT's Avatar
    Senior Member

    Status
    Offline
    Join Date
    Jul 2011
    Location
    amherstburg, ontario
    Posts
    161

    Default

    Not meaning to high jack the thread but since we talkin about ignition. What is a good spark plug to go with? I still have the factory stuff on there with 215 000kms on them. I'm thinkin bout changing the plugs and wondering if I should just go with the stock ones or if there's better stuff out there. thanks
    1999 Dakota R/T, 3" spintech exhaust

    1983 Dodge Ramcharger 360 4bbl, 4 speed, Dual dynomax exhaust, Edelbrock carb 600cfm, Mopar performance ignition, 4 inch skyjacker lift, Rancho shocks, steering stabilizer, 35's, Mickey Thompson rims

    "There's no replacement for displacement"

  8. #8



    grapejuice1998's Avatar
    Send Lawyers Guns & Money

    Status
    Offline
    Join Date
    Jan 2008
    Location
    Dallas, TX
    Posts
    9,739

    Default

    Quote Originally Posted by 360magRT View Post
    Not meaning to high jack the thread but since we talkin about ignition. What is a good spark plug to go with? I still have the factory stuff on there with 215 000kms on them. I'm thinkin bout changing the plugs and wondering if I should just go with the stock ones or if there's better stuff out there. thanks
    You will get 100 answers, from the simple and cheap, to the complex and expensive. Everyone has their pet spark plug. However, the stock Champion plug is awesome. I believe it's RC12LC4.
    Alan Short
    D.R.T.C. #15


  9. #9


    slvr03dakrt's Avatar
    make it bigger STROKE IT

    Status
    Offline
    Join Date
    Jan 2008
    Location
    Memphis, TN
    Posts
    2,491

    Default

    I run an autolite 3922with nitrous or 3923 for the street


    Forged 408 12.10 @ 111mph under the knife again

  10. #10
    Senior Member

    Status
    Offline
    Join Date
    Feb 2008
    Location
    Central Kentucky
    Posts
    5,154

    Default

    Stock type Projected tip, good for at least 1* less ignition advance needed when compared to the older style non projected tips. Comparing the two, less advance equals less negative work put on the piston as it comes up to top dead center on the compression stroke.
    The Dakota RT is gone... but not forgotten.

    '15 Granite Crystal Metallic SRT 392.

  11. #11

    BluRT00's Avatar
    Muscle Of Love

    Status
    Offline
    Join Date
    Feb 2008
    Location
    Cape Coral, FL
    Posts
    6,197

    Default

    Quote Originally Posted by Intense RT View Post
    Stock type Projected tip, good for at least 1* less ignition advance needed when compared to the older style non projected tips. Comparing the two, less advance equals less negative work put on the piston as it comes up to top dead center on the compression stroke.
    Fuck your smart.

+ Reply to Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •