SAC certainly doesn't provide a "far dirtier burn", BD testing or not.
If 155 degrees provide a dirty burn on the pistons you posted a pic of, I'd look to the injector build, even with decently advanced timing.
Within sensible parameters, injector cleanliness & performance greatly depends on the builder, more than the type of nozzle.
If 155 degrees provide a dirty burn on the pistons you posted a pic of, I'd look to the injector build, even with decently advanced timing.
Within sensible parameters, injector cleanliness & performance greatly depends on the builder, more than the type of nozzle.