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24 volts in BBC with magnet

Discussion in 'The Hokey Ass Message Board' started by mctommy, Jul 15, 2013.

  1. mctommy
    Joined: Aug 7, 2008
    Posts: 296

    mctommy
    Member
    from sweden

    Seems i have a little to slow speed on the starter to give the Hunt magnet a really good spark, i would like to spin it faster with a 24 V battery but will it hold up or burn to pieces fast?? (the starter motor)

    It,s an altered with BBC, stack injection and methanol, gives it a shot of gasoline down the stacks at startup but that doesn't help much.
     
  2. KrisKustomPaint
    Joined: Apr 20, 2007
    Posts: 1,107

    KrisKustomPaint
    Member

    You shouldn't need 24 to crank it over unless the compression is super high. Maybe you have a bad ground or the power wire isn't large enough for the length that you are running. Resistance increases with wire length. That being said. you can run a 6 volt starter on 12 volts, so I would imagine a 24 would work with a 12 volt starter. I've also seen guys run two starters. Or maybe you should try a high torque starter. Lots of options, 24 volts might not be the way to go. How many rpm are you turning on cranking?
     
  3. Dan Timberlake
    Joined: Apr 28, 2010
    Posts: 1,322

    Dan Timberlake
    Member

    Related to what KrisKustomPaint said, I'd measure the voltage drop on the positive and negative circuits while cranking. First the entire circuit from B+ battery post to starter terminal, the B- starter housing. Then each circuit in steps
    A drop over maybe 0.1 volt DC would benefit from bigger wire or cleaner, better connection, and the step wise measurement will point to the culprit.
     
  4. Don's Hot Rods
    Joined: Oct 7, 2005
    Posts: 8,319

    Don's Hot Rods
    Member
    from florida

    You want amps, not voltage. I ran two 12 volt batteries in parallel in my Mustang drag car, it gave me lots of kick but only 12 volts. It is the same thing with boats that run two batteries, they are hooked up in parallel to effectively make one big 12 volt battery.

    Don
     

  5. revkev6
    Joined: Jun 13, 2006
    Posts: 3,351

    revkev6
    Member
    from ma


    this was my first thought
     
  6. mctommy
    Joined: Aug 7, 2008
    Posts: 296

    mctommy
    Member
    from sweden

    Hmmmm, i will try this first!
     
  7. Jmountainjr
    Joined: Dec 29, 2006
    Posts: 1,365

    Jmountainjr
    ALLIANCE MEMBER

    Typical Vertex mag spark plug gap is .018"-.020".
     
  8. mctommy
    Joined: Aug 7, 2008
    Posts: 296

    mctommy
    Member
    from sweden

    Great! Thanks all, will use your recomendations! :)
     
  9. Pete1
    Joined: Aug 23, 2004
    Posts: 2,025

    Pete1
    Member
    from Wa.

    If all else fails, you may have to go to an external plug-in starter.
    That will also lighten the car considerably.
     
  10. just curious.....does a Hunt magneto have an impulse coupler? some magnetos on old tractor engines and airplanes do
     
  11. seb fontana
    Joined: Sep 1, 2005
    Posts: 7,034

    seb fontana
    Member
    from ct

    No...
     
  12. afaulk
    Joined: Jul 20, 2011
    Posts: 1,191

    afaulk
    Member

    A 16v battery will do the trick.
     
  13. afaulk
    Joined: Jul 20, 2011
    Posts: 1,191

    afaulk
    Member

    check out Rock Racing Batteries. They have a 3 post battery that allows you to run your starter on 16v which will really spin your starter and run everything else on 12v.
     
  14. Don's Hot Rods
    Joined: Oct 7, 2005
    Posts: 8,319

    Don's Hot Rods
    Member
    from florida

    Just curious, how do you charge a 16 volt one ?

    Don
     
  15. H.G. Wells
    Joined: Mar 11, 2006
    Posts: 386

    H.G. Wells
    Member

    What Don said. 15.35:1 BBC and I run two deep cycle bats that plugs in to start, and have yet to fry the starter. I do carry a spare in the trailer.
    Plus with twice the battery I do not have to charge them between rounds.
     
  16. afaulk
    Joined: Jul 20, 2011
    Posts: 1,191

    afaulk
    Member

    :p With a 16v charger of course:D hehehehehe, seriously though, you are one of the people whose posts are always worthwhile and I really don,t want that to sound like a smart alec answer.
     
  17. afaulk
    Joined: Jul 20, 2011
    Posts: 1,191

    afaulk
    Member

    I have a 540" 12.6-1 BBC with a 14-71 Littlefield, a 44 amp mag, a cam driven fuel pump, etc. It takes quite a starter to turn it over. After wasting a few flex plates and flywheels, I got a Mezeire 10 pitch flexplate and one of their starters. Man what a difference. Expensive and worth every penny.
     
  18. Engine man
    Joined: Jan 30, 2011
    Posts: 3,476

    Engine man
    Member
    from Wisconsin

    We used 24 volts on the starter of a small block Ford in a street stock dirt track car with no problems. We used a knife switch to change the batteries to series for starting if necessary and parallel for charging with the 12 volt alternator. Everything else was run off the first 12 volt battery. Never burned up a starter on 24 volt. Ruined a couple trying to run more current through them with the 2 - 12 volts in parallel.
     
  19. mctommy
    Joined: Aug 7, 2008
    Posts: 296

    mctommy
    Member
    from sweden

    I am a little confused by all good answers... some say that more amps by paralell is the way to go while some prefer to put them in serie and run 24 for higher speed....
    My engine (461) has 13,5:1
     
  20. Have you tried spinning it with ignition off then turn ignition on once starter is up to speed ?
     
  21. eddiebroadway
    Joined: Feb 3, 2007
    Posts: 25

    eddiebroadway
    Member

    I had a similar problem with one 12 volt battery, swapped to a Turbostart 16 volt and charger, spun my 15-1 572 like the plugs were out of it. I ran the whole car on 16 volts, no problem.
     
  22. GMC BUBBA
    Joined: Jun 15, 2006
    Posts: 3,385

    GMC BUBBA
    Member

    OR you could fix the actual problem. The magnets in the mag are weak or the clearance is off a bit. A good vertex will spark at one rpm . Like the others have said lower the plug gap and if needed have someone freshen the magneto.
    We have a shop in Indianapolis ( Magtech 317-241-4100) that builds the magnetos..
     
  23. mctommy
    Joined: Aug 7, 2008
    Posts: 296

    mctommy
    Member
    from sweden

    The Hunt magnet is new from alkydigger, i will try to lower the gap on the plugs, Which by the way are br7es. Thanks.
     

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