I just bought a set of the often recommended NGK copper plugs, and would like to know what optimal gap would be for them. I am running an HKS FMIC, DM FPR, NGK plug wires, and a full 3 inch exhaust. So what is my optimal gap? I was thinking around .030, ideas?
Optimal spark plug gap for mild mods
- Thread starter SupraMan1987
- Start date
Too many variables to say, Bigger the better if your ignition can fire it without spark blowout around torque peak.
Start big then test if you get a stumble around 5000rpm, drop 4 thou and try again until it pulls cleanly then drop 2 thou to be safe and that will be YOUR optimal gap.
Start big then test if you get a stumble around 5000rpm, drop 4 thou and try again until it pulls cleanly then drop 2 thou to be safe and that will be YOUR optimal gap.
what does the larger gap do? more complet burn? ive been running .028 with no issues. sp61, 3"tbe, 15psi, full 2.5" IC/IC piping etc...