'83 Ram Slant 6 spark plug type

Discussion in 'General Motoring' started by N.Cass, Aug 24, 2004.

  1. N.Cass

    N.Cass Guest

    Hello all, quick question. I purchased some spark plugs at the local store
    and they gave me Champion RV17YC, which is what their computer reccomended.
    However when I got home and checked the emissions sticker on the truck it
    stated Champion RBL16Y. Can I use the RV17YC's on this or do I need to get
    the right plug? They look to be identical in size.(1983 Dodge Ram Slant 6,
    converted from Lean Burn to Electronic Ignition.

    Thanks for your help


    Remove number one when replying by electronic mail
    N.Cass, Aug 24, 2004
  2. WRONGO, that plug is too hot and will exacerbate this engine's already
    high tendency to ping.

    Champion has gone consolidation-crazy over the last five to eight years,
    deleting plugs from their line left and right. This isn't because there's
    been some magical development in spark plugs that widens the heat range.
    It's because it's cheaper to have fewer plugs in a line than it is to have
    more plugs in a line. This is what happens when MBAs, rather than
    engineers, run auto parts companies.
    Even these are unnecessarily hot on today's gasolines, which are much
    easier on spark plugs from a fouling perspective than were the gasolines
    of 22 years ago. You can go a range or even two ranges cooler and get some
    relief from pinging (which in turn can allow the disconnection of EGR
    and/or advancement of the ignition timing for improved driveability and
    mileage) without fear of pinging on today's cleaner-burning gasolines.

    All my annotated spark plug books are at the office; tomorrow I'll dig up
    my notes on plugs for '75-'87 slant-6s with the taper-seat spark plugs.
    There are a few specific ones that work better than others, regardless of
    brand selection. I do not recommend you use the RV17YCs. (Yes, they are
    physically identical. No, that does not mean they're the same.)

    www.slantsix.org is a good place to hang out...

    Daniel J. Stern, Aug 24, 2004
  3. N.Cass

    Bill Putney Guest

    FWIW, I believe that the primary way the heat range is tweaked on a plug
    design is in the amount of depth of the recess between thread body and
    insulator, effectively shortening or lengthening the heat path from the
    plug's tip to the cylinder head (big freaking heat sink). Since this
    detail is virtualy invisible to the casual observer, otherwise identical
    plugs by the same manufacturer but of different heat ranges can appear
    to be identical.

    Bill Putney
    (to reply by e-mail, replace the last letter of the alphabet in my
    address with "x")
    Bill Putney, Aug 24, 2004
  4. Yep, exactly. Good catch. What I intended was that they *appear*
    physically identical, and are physically interchangeable (same thread,
    same seat, etc.) but are not the same.

    Daniel J. Stern, Aug 24, 2004
  5. See if you can find Autolite 25s.

    Daniel J. Stern, Aug 24, 2004
  6. N.Cass

    Guest Guest

    I've always used 14s, except on my modified engines where I used 3s
    Guest, Aug 24, 2004
  7. N.Cass

    N.Cass Guest

    Thanks for all the input everyone! I already ran the truck with the
    RV17YC's, and it seemed to run very well (no pinging, smooth
    acceleration, smooth cruising), but I will check into the Autolite 25's.

    On another note, I had posted to this newsgroup a few months ago about a
    2 barrel conversion for this truck. I went to the '04 Mopar Nationals in
    Columbus, OH and found a "Super Six" cast iron 2bbl intake/exhaust
    manifold, carb, all the choke parts, kickdown linkage (although I do not
    need it)and breather in one package. So I will begin swapping those
    items in (after I clean them up) and I will post my results to the group.

    Thanks again for all the help!!
    N.Cass, Aug 24, 2004
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.