If a mag is so powerful, why can I run a .045″ plug gap with an electronic ignition and only .018″ with a mag?
By running a tight plug gap, you are making sure that the spark gets to the plug. If you run a wider gap than that with a mag, you may end up with the spark arcing to other objects inside the mag or crossfire between plug wires. The spark plug needs to be an easy path or it will find another. • How much mag do I *REALLY* need for my application (drag race, blown alcohol, nitro, circle track…) No one really knows for sure what you’ll require, but we can make some educated guesses based on the experiences of others and their equipment. Here are some general rules of thumb that will ensure good performance… Circle track: Standard OAC Vertex or Sprint Mag (up to 2.5 amps) Street/Hot Rod: Any standard OAC Vertex or Sprint mag Blown gas: 2-3 amp Vertex or Super Mag 2 Mild Blown alcohol (up to 10 PSI of boost): 3 amp Vertex or Super Mag 3 Moderate Blown Alcohol (up to 20 PSI boost): 4 amp Vertex or Super Mag 4 Hard core Blown alcohol (~30 PSI boost): 6 amp OXC Vertex or 6 amp Super Mag 5
