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Thread: How to Upgrade to High Energy Ignition (HEI)

  1. #11
    Uncensored Hypocrite stevedmc's Avatar
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    Quote Originally Posted by Patrick C View Post
    Thanks, Bill. By the way, where did you get your really good spark plug wires I've read about before?
    I hate to admit it but I got my MSD wires from Hervey. Drew also purchased his from Hervey. I don't have the tools to make my own wires.
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  2. #12
    Just Plain Nuts Lou and "Boo"'s Avatar
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    I think Bill recommended MSD wires IIRC. I got my set from Hervey but that was years ago. I'm sure Bill knows of a less expensive source. (If I'm correct about the MSD wires)
    Lou and "Boo" - The man you love to hate.

    Boo- The car you love to hate.

    ~~~~~~~~~~~~~~~~~~~
    "Boo"-VIN 5835
    'Fastest naturally aspirated PRV'
    ~~~~~~~~~~~~~~~~~~~~
    "Blue"-1985 Fiero GT
    3800sc swap

  3. #13
    Quote Originally Posted by stevedmc View Post
    I don't have the tools to make my own wires.
    All you need is a vise. MSD provides a crimping tool that you close with the jaws of the vise. Also need a pair of wire cutters, a pair of needle nose pliers, and a razor blade (crimping tool has a stripper built in that you use with the razor blade).

    I like to make my own spark plug wires because each wire is custom length. MSD doesn't make ready made wiresets for applications such as my 6 cylinder Ford trucks:

    BrownTruckWires.jpg ServiceTruckWires.jpg

    My school buses also have custom length wires:

    RedBus1.jpg

    On my DeLorean I was able to use 90 degree terminals for the driver side and straight terminals for the passenger side (distributor cap is already angled 45 degrees towards the passenger side). This makes a much neater wire run and prevents the passenger side wires bending back upon themselves (wouldn't work with K-Jet on top of course):

    DeLoreanWires1.jpg DeLoreanWires2.jpg

    You want MSD wires because they are made of real wire. Carbon fiber wires are made of a fiberous carbon mixture that eventually fatigue breaks (I used to call them carbon impregnated string, but that is incorrect -- the fibers are not contiguous). On the school bus engine that my church's Bus Killer burned up there are still 8 wires running from what once was a distributor cap to the spark plugs. Insulation jackets are of course long gone, but the wire core is still there.

    Speaking of insulation jackets: you do know that wire size refers to the OD of the jacket, not the conductive core inside?

    Bill Robertson
    #5939
    Last edited by Greasy DeLorean Mechanic; 02-26-2014 at 09:25 PM.

  4. #14
    Just Plain Nuts Lou and "Boo"'s Avatar
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    I bought mine from Hervey, but I don't remember them being this expensive, maybthywere though.

    Delorean custom spark plug wire. MSD 8.5 MM high performance.

    50 ohms per foot for more transfer
    fire power. Limited life warranty
    $109.95


    On this page at bottom right.
    http://specialtauto.com/delorean-par...ne-tuneup.html
    Lou and "Boo" - The man you love to hate.

    Boo- The car you love to hate.

    ~~~~~~~~~~~~~~~~~~~
    "Boo"-VIN 5835
    'Fastest naturally aspirated PRV'
    ~~~~~~~~~~~~~~~~~~~~
    "Blue"-1985 Fiero GT
    3800sc swap

  5. #15
    That price isn't far removed from Jeg's price for a universal set ($89.95, free shipping). Of course a universal set gives you two extra terminals & wires, and the wires you do use are long enough to get a second DeLorean out of them.

    Bill Robertson
    #5939

  6. #16
    Among those of use with exposed distributors, would there be any interest in MSD plug wires with straight terminals on the passenger side? I'd be happy to make them for materials cost alone. I'm guessing I could make passenger side for $20-25, and a complete set around $50. Only limitation is the PRV plug boots -- I'd need to get the old ones back as reusable cores (just like angle drive nuts).

    Edit: Amazon sells a Delco set of PRV wires for $31. If people don't mind paying $5 per plug boot I can source new ones.

    Edit Edit: Amazon sells Wells QW660 wiresets for $19, and they are supposed to xRef to Bosch 9095 (standard PRV), so that would bring new plug boots down to $3.17 per.

    Bill Robertson
    #5939
    Last edited by Greasy DeLorean Mechanic; 02-27-2014 at 10:56 AM.

  7. #17
    KJET_SUX FABombjoy's Avatar
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    Magnecor 6506 is another 8.5mm alternative to the MSD wires. I run those in combo with an MSD 6530, Accel coil, and Denso Iridium plugs. Plugs/wires have been trouble-free since installed in 2005.
    -Luke / 10270 / Turbo / EFI

  8. #18
    Make sure you widen the plug gaps too. I can't count on my fingers & toes the number of owners who have thrown a performance coil on their car yet leave the plugs gapped .024", thinking they have HEI.

    John Hervey advertises HEI coils on his website, but doesn't say a word about plug gaps.

    Recently helped a neighbor gap some plugs for his early 2000's Chevy pickup: .060"!

    Biggest advantage of performance wires isn't lower resistance (at 40,000 volts, a few hundred ohm don't really add up to a hill of beans) -- it's durability. Carbon fiber wires just don't last.

    Bill Robertson
    #5939
    Last edited by Greasy DeLorean Mechanic; 02-27-2014 at 02:18 PM.

  9. #19
    Simple diagram to illustrate standard DeLorean plug gap versus my particular HEI plug gap (note that the gaps are scaled against each other -- .044 gap was drawn 1.7 times bigger):

    HEISparkPlugGapDiagram.JPG

    Remember that the plug gap acts as a rudimentary voltage regulator -- increasing the gap increases the amount of voltage necessary to jump it, decreasing the gap decreases the amount of voltage necessary to jump it.

    Note also that a larger plug gap creates a larger flame front (more of the cylinder charge is exposed to the spark). Imagine starting a fireplace fire not only with a larger match, but with the newspaper lit in two corners rather than just one.

    Bill Robertson
    #5939

  10. #20
    Reference in another thread to some of the online community's better known pontificators and prevaricators reminded me of old arguments against HEI: no one has ever argued that HEI was harmful or detrimental -- only that it was unnecessary (which I disagree with BTW).

    Despite the fact that high winding coils such as Pertronix cost *LESS* than Bosch blue coils, one owner even argued that HEI was expensive snake oil.

    For the cost of a $35 coil, my opinion is: just try it. If you don't like it you can always close the plug gap back up and go right back to where you were before.

    Bill Robertson
    #5939

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