Spark Gap

E

EBarton

New member
I'm installing a 6.5:1 Head on my Burtz engine, and using Champion WY18 plugs. What is the recommended gap for my spark plugs
 
Spark plug gap for modified engines require a bit of experimentation on your part. you can start with standard gap setting and then either make it smaller or wider to see how the engine response changes. I set my 3x plugs at .025 for the best running when I changed to a 6 to 1 Brumfield head.
 
I have a 6.5 Burtz head, stock distributor but high output coil, and 0.035 gap. A smaller gap at the rotor in the distributor helps.
 
Generally speaking, a wider gap will give you a better idle but may reduce your wide-open-throttle performance, especially if your coil is marginal. A hot coil will improve performance at WOT with a larger gap. Dragsters use a very large gap with a very hot ignition system and replace the burned out plugs after each run.
 
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